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Topological waveguide crossing between pseudo-spin-valley-locked domain-wall states 认领 引用
1
作者 JIA-YI LIU ZI-XUAN GAO +4 位作者 HAO-CHANG MO XIAO-DONG CHEN JIAN-WEI LIU WEN-JIE CHEN JIAN-WEN DONG 《Photonics Research》 SCIE EI CAS CSCD 2026年第5期1722-1736,共15页
Pseudo-spin and valley are two significant degrees of freedom in topological photonics,which enable the realization of robust boundary states and consequently tremendous fabrication-tolerant photonic devices.As integr... Pseudo-spin and valley are two significant degrees of freedom in topological photonics,which enable the realization of robust boundary states and consequently tremendous fabrication-tolerant photonic devices.As integration density increases in photonic chips,low-crosstalk waveguide crossings become critical for maintaining overall performance.With conventional waveguide crossings susceptible to defect-induced backscattering,topology can provide a viable solution to this issue.Here,we experimentally demonstrate a topological waveguide crossing based on pseudo-spin-valley-locked domain-wall states. 展开更多
关键词 waveguide crossings topological waveguide crossing pseudo spin valley locked domain wall states realization robust boundary states photonic chipslow crosstalk photonic devices integration density topological photonicswhich
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A Cross-Band Quantum Light Source Based on Spontaneous Four-Wave Mixing in a Shallow-Ridge Silicon Waveguide 认领 引用
2
作者 Yijia Wang Qirui Ren +2 位作者 Zhanping Jin Yidong Huang Wei Zhang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第1期64-70,共7页
To fully utilize the resources provided by optical fiber networks,a cross-band quantum light source generating photon pairs,where one photon in a pair is at C band and the other is at O band,is proposed in this work.T... To fully utilize the resources provided by optical fiber networks,a cross-band quantum light source generating photon pairs,where one photon in a pair is at C band and the other is at O band,is proposed in this work.This source is based on spontaneous four-wave mixing(SFWM)in a piece of shallow-ridge silicon waveguide.Theoretical analysis shows that the waveguide dispersion could be tailored by adjusting the ridge width,enabling broadband photon pair generation by SFWM across C band and O band.The spontaneous Raman scattering(SpRS)in silicon waveguides is also investigated experimentally.It shows that there are two regions in the spectrum of generated photons from SpRS,which could be used to achieve cross-band photon pair generation.A chip of shallow-ridge silicon waveguide samples with different ridge widths has been fabricated,through which cross-band photon pair generation is demonstrated experimentally.The experimental results show that the source can be achieved using dispersion-optimized shallow-ridge silicon waveguides.This cross-band quantum light source provides a way to develop new fiber-based quantum communication functions utilizing both C band and O band and extends applications of quantum networks. 展开更多
关键词 photon pair generation shallow ridge silicon waveguide spontaneous four wave mixing optical fiber networks adjusting ridge widthenabling cross band quantum light source broadband photon pair generation waveguide dispersion
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Achromatic single-layer waveguide for wide-view augmented reality displays 认领 引用
3
作者 JIANBIN QIU ZIJIAN LIN +10 位作者 LISHENG YAO HAONAN JIANG MAN-CHUN TSENG FION SZE YAN YEUNG YUN YE SHENG XU QUN YAN TAILIANG GUO HOI-SING KWOK WANLONG ZHANG ENGUO CHEN 《Photonics Research》 SCIE EI CAS CSCD 2026年第5期2107-2120,共14页
Waveguide technology stands as the cornerstone of augmented reality(AR)displays.The polarization volume grating(PVG),with strong refractive index modulation and distinctive polarization selectivity,has exhibited great... Waveguide technology stands as the cornerstone of augmented reality(AR)displays.The polarization volume grating(PVG),with strong refractive index modulation and distinctive polarization selectivity,has exhibited great potential to achieve the two core prerequisites[full-color vision and wide field of view(FOV)]of current wave-guide-based AR displays.However,the development of single-layer full-color PVG waveguides remains stagnant,primarily hindered by severe chromatic dispersion. 展开更多
关键词 achromatic single layer waveguide polarization volume grating pvg refractive index modulation chromatic dispersion waveguide technology polarization selectivityhas polarization volume grating wide view augmented reality displays
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Ridge waveguide SiGe/Si phototransistor with high responsivity 认领 引用
4
作者 Xie Hong-Yun Xu Zi-Mai +5 位作者 Jiao Wei-Zhao Ma Yu-Dong Liu Zi-Ming Chen Liang Na Wei-Cong Zhang Wan-Rong 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2026年第3期491-499,共9页
Silicon-based phototransistor detectors,offering advantages such as high internal gain,cost-effective and compatibility with CMOS technology,are becoming one of the key devices for large-scale photon integration chip ... Silicon-based phototransistor detectors,offering advantages such as high internal gain,cost-effective and compatibility with CMOS technology,are becoming one of the key devices for large-scale photon integration chip and have significant potential for applications in short-distance optical interconnecting.To relieve its inherent optimization contradiction between responsivity and bandwidth performance,a novel couple ridge waveguide SiGe/Si phototransistor was proposed,in which the carrier transport and the photon propagation were perpendicu⁃lar and demonstrate the independent optimization on absorption efficiency and operating speed.The optical propa⁃gation mode in the SiGe/Si ridge waveguide were analyzed between the single mode and the multiple mode.The geometric parameters of the ridge waveguide to achieve high absorption efficiency were optimized.The ridge waveguide SiGe/Si phototransistor were fabricated using technology compatible with CMOS process platform and achieved a responsivity of 6.4 A/W with the dark current of 10 nA. 展开更多
关键词 phototransistor high responsivity ridge waveguide photodetector silicon photonics
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Comparing the Indoor and Solar Performance of Light-Concentrating Waveguide-Encoded Lattice Slim Films 认领 引用
5
作者 Takashi Lawson Kathryn A.Benincasa +7 位作者 Anjilee Manhas Fariha Mahmood Helen Tunstall-García Zhihang Wang Zhongjin Shen Marina Freitag Kalaichelvi Saravanamuttu Rachel C.Evans 《Carbon Energy》 SCIE EI CAS CSCD 2026年第1期187-196,共10页
Although multicrystalline Si photovoltaics have been extensively studied and applied in the collection of solar energy,the same systems suffer significant efficiency losses in indoor settings,where ambient light condi... Although multicrystalline Si photovoltaics have been extensively studied and applied in the collection of solar energy,the same systems suffer significant efficiency losses in indoor settings,where ambient light conditions are considerably smaller in intensity and possess greater components of non-normal incidence.Yet,indoor light-driven,stand-alone devices can offer sustainable advances in next-generation technologies such as the Internet of Things.Here,we present a non-invasive solution to aid in photovoltaic indoor light collection—radially distributed waveguide-encoded lattice(RDWEL)slim films(thickness 1.5 mm).Embedded with a monotonical radial array of cylindrical waveguides(±20°),the RDWEL demonstrates seamless light collection(FoV(fields of view)=74.5°)and imparts enhancements in JSC(short circuit current density)of 44%and 14%for indoor and outdoor lighting conditions,respectively,when coupled to a photovoltaic device and compared to an unstructured but otherwise identical slim film coating. 展开更多
关键词 indoor light light concentrators optical thin films photopatterning photovoltaics self-induced waveguides solar energy
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Energy engineering and mechanical elasticity of molecular crystals via supramolecular salt strategy for flexible visible optical waveguide 认领 引用
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作者 Lizhi Wang Chuanxin Wei +14 位作者 Xinyu Du Yingying Zheng Shuang Li Ning Sun Zhiqiang Zhuo Ningning Yu Yingru Lin Zhiyang Sun Jinyi Lin Man Xu Yongzheng Chang Tianshi Qin Zhoulu Wang Xuehua Ding Wei Huang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期437-441,共5页
Improving the optoelectronic behavior and stress-deformation stability of conjugated materials is crucial for the realization of their potential applications in flexible optoelectronics.To tune the emission behavior a... Improving the optoelectronic behavior and stress-deformation stability of conjugated materials is crucial for the realization of their potential applications in flexible optoelectronics.To tune the emission behavior and mechanical property of molecular crystals simultaneously via supramolecular salt strategy is rarely reported,which is very important to improve their photophysical behavior and softness for the fabrication of flexible light-emitting device.Herein,supramolecular salt approach has been successfully applied to synthesize two elastic organic fluorescent crystals(CMOH-Py-Cl and CMOH-Py-Br)derived from non-emissive and brittle pyridine-substituted coumarin derivative(CMOH-Py).Their elastic properties can be attributed to the prevalent presence of numerous weak interactions introduced by halogen atoms,which are beneficial to the absorption and release of mechanical energy.Furthermore,density functional theory(DFT)calculations demonstrated a narrowing of the HOMO-LUMO energy gaps from CMOH-Py to CMOH-Py-Cl/CMOH-Py-Br via supramolecular salt approach.Finally,the application of flexible crystal materials in the field of optical waveguides has been investigated.The transformation of crystals in terms of photophysical and mechanical properties,achieved by the supramolecular salt approach,offers novel insights into the design and construction of flexible crystalline materials,providing a new path for the development of next-generation smart materials. 展开更多
关键词 Supramolecular salt strategy Flexible molecular crystals Energy engineering Optical property Flexible visible optical waveguide
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Non-reciprocal and artificial A-type systems in waveguide QED with parametrically modulated superconducting qubits 认领 引用
7
作者 Bing-Jie Chen Li Li +5 位作者 Rui-Yang Gong Silu Zhao Shi Xiao Xiaohui Song Zhongcheng Xiang Dongning Zheng 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第6期572-584,共13页
We present a non-local quantum system based on a waveguide QED architecture,comprising two spatially separated and largely detuned superconducting transmon qubits.By applying parametric frequency modulation to one of ... We present a non-local quantum system based on a waveguide QED architecture,comprising two spatially separated and largely detuned superconducting transmon qubits.By applying parametric frequency modulation to one of the qubits,we establish a tunable coherent channel between the two far-detuned qubits,thereby forming anΛ-type three-level system.We demonstrate that tuning the modulation amplitude enables the observation of spectral evolution from electromagnetically induced transparency(EIT)to Autler–Townes splitting(ATS).Furthermore,by exploiting the interplay between the non-local waveguide phase and system dissipation,the system achieves significant non-reciprocal microwave transmission and direction-selective photon emission.The scheme operates without external magnetic fields,offering an efficient pathway for realizing on-chip integrated quantum routers and isolators. 展开更多
关键词 waveguide QED superconducting qubits parametric modulation
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Low-loss waveguide design for full visible spectrum on-chip photonic devices 认领 引用
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作者 ZOU Jing-chen LUO Peng +1 位作者 MA Xu ZHAO Yi-hui 《中国光学（中英文）》 EI CAS CSCD 北大核心 2026年第3期715-729,共15页
Extending the operational wavelength range of integrated optical devices to cover the entire vis-ible spectrum holds significant importance,as it can enhance the detection accuracy and applicability of mini-aturized s... Extending the operational wavelength range of integrated optical devices to cover the entire vis-ible spectrum holds significant importance,as it can enhance the detection accuracy and applicability of mini-aturized spectrometers,broaden the bandwidth of visible light communication,and enable biosensors to sim-ultaneously detect multiple biomolecules in complex samples.As the fundamental building block of integ-rated optical devices,waveguides have not yet been thoroughly investigated for full visible spectrum opera-tion.This work presents a waveguide design supporting the full visible spectrum(435−760 nm).Numerical simulations were employed to analyze the transmission characteristics of various waveguide structures,re-vealing that single-mode propagation cannot be achieved across the entire visible spectrum.Under mul-timode propagation conditions,key parameters such as propagation loss and mode distribution were system-atically examined to determine the optimal waveguide dimensions,bending radii,and waveguide spacings for low-loss transmission.For slab waveguides,a thickness≥1μm ensures polarization insensitivity.For strip waveguides with a thickness of 1μm,a width≥2μm significantly reduces scattering loss induced by side-wall roughness.For strip waveguides with a width of 1μm and thickness of 2μm,radiation loss becomes negligible when the bending radius≥10μm and waveguide spacing≥0.4μm,while maintaining effective isolation from adjacent waveguides.Additionally,the impact of fabrication tolerances on waveguide per-formance was evaluated.In contrast to previous studies primarily focusing on narrow spectral bands within the visible range,the proposed design enables full visible spectrum transmission in a single waveguide,thereby facilitating bandwidth expansion and performance enhancement for on-chip full visible spectrum devices. 展开更多
关键词 integrated optics devices waveguides visible light low-loss silicon nitride
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Bistable Goos-Hanchen shift owing to leaky-mode excitation in a slab waveguide with Kerr nonlinear medium 认领 引用
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作者 Yuan-Ping Cai Li Jiang Ren-Gang Wan 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期417-424,共8页
We investigate the nonlinear Goos-Hanchen shift of a light beam reflected from a prism-coupled leaky waveguide containing a Kerr medium.As the incident power varies,the system can switch between two states,total inter... We investigate the nonlinear Goos-Hanchen shift of a light beam reflected from a prism-coupled leaky waveguide containing a Kerr medium.As the incident power varies,the system can switch between two states,total internal reflection and frustrated total reflection,owing to the inherent positive feedback arising from the intensity-dependent guiding mode resonance.The reflectance exhibits optical bistability;meanwhile,the lateral shift of the reflected beam also shows hysteresis behavior.It is found that the transition between the two stable states is related to the excitation of a leaky mode in the waveguide,which results from the modulation of the electric field in the nonlinear substrate.We also analyze the effects of system parameters on the bistable Goos-Hanchen shift.The thresholds as well as the width of the hysteresis curve are sensitive to the thicknesses of the gap layer and the guiding layer,which determine the resonance angle.The bistable lateral displacement in the slab waveguide may have potential applications in optical switching,beam steering,etc. 展开更多
关键词 Goos-Hanchen shift optical bistability waveguide nonlinear optics
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Integrated multi-wavelength interferometer using waveguide holograms for nanometer precision sensing 认领 引用
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作者 DAVID DE VOCHT IRWAN SETIJA +2 位作者 JORN VAN ENGELEN YUQING JIAO ERWIN BENTE 《Photonics Research》 SCIE EI CAS CSCD 2026年第5期1844-1853,共10页
We present a tri-wavelength integrated photonic interferometer for nanometer-resolution displacement sensing in semiconductor metrology.The device integrates large-area waveguide hologram couplers optimized for 635 nm... We present a tri-wavelength integrated photonic interferometer for nanometer-resolution displacement sensing in semiconductor metrology.The device integrates large-area waveguide hologram couplers optimized for 635 nm,780 nm,and 850 nm to illuminate and receive light from a reflective target,forming a Mach-Zehnder interferometer.A novel design method enables scalable intensity control,achieving an average focusing efficiency of -12.8 dB,the highest reported for tri-wavelength couplers,to our knowledge.Interferometric operation was verified at 633 nm and 775 nm. 展开更多
关键词 integrated multi wavelength interferometer tri wavelength photonic interferometer semiconductor metrology design method photonic interferometer scalable intensity controlachieving waveguide hologram couplers nanometer precision sensing
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High isolation dual circularly polarized antenna in gap waveguide technology for mm-Wave satellite communications 认领 引用
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作者 QUAN Shuanglong CAO Jianyin +1 位作者 HE Chao WANG Hao 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2026年第3期836-843,共8页
A millimeter-wave(mm-Wave)dual circularly polarized(CP)antenna in gap waveguide(GWG)technology with high port isolation is proposed in this paper.It is consisted of a simplified orthomode transducer(OMT)and an improve... A millimeter-wave(mm-Wave)dual circularly polarized(CP)antenna in gap waveguide(GWG)technology with high port isolation is proposed in this paper.It is consisted of a simplified orthomode transducer(OMT)and an improved multi-section hexagonal waveguide CP horn antenna.The OMT is composed of two metal layers without the traditional septum or iris,which makes the structure simpler.The CP horn antenna can be easily integrated with the OMT without mode conversion.The principle analysis as well as the simulated and measured results of the proposed antenna are given in this paper.The simulated and measured results agree very well with each other.The port isolation of more than 27 dB over bandwidth of 26.5-31 GHz(|S11|<-15 dB)is achieved with relative bandwidth of 15.7%.The axial ratio(AR)lower than 2.5 dB for both left-hand and righthand CP(LHCP and RHCP)are achieved over the bandwidth.The proposed antenna is a candidate for mm-Wave satellite communications or beyond fifth-generation(5G)communications applications. 展开更多
关键词 dual circularly polarized antennas gap waveguide orthomode transducer millimeter wave
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EUV-IR beam separator based on laser-fabricated hollow waveguides 认领 引用
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作者 Anna Gabriella Ciriolo Gabriele Crippa +11 位作者 Stavroula Vovla Kamal Abedin Michele Devetta Davide Faccialà Andrea Annunziata Pasquale Barbato Luca Poletto Fabio Frassetto Roberto Osellame Caterina Vozzi Salvatore Stagira Rebeca Martínez Vázquez 《Advanced Photonics Nexus》 CSCD 2026年第4期284-292,共9页
Leveraging the natural axial confinement of coherent extreme ultraviolet(EUV)light generated via the high-order harmonic generation process,we demonstrate the spatial separation of EUV and the driving infrared(IR)beam... Leveraging the natural axial confinement of coherent extreme ultraviolet(EUV)light generated via the high-order harmonic generation process,we demonstrate the spatial separation of EUV and the driving infrared(IR)beams through hollow-core microchannels embedded in a laser machine glass device.This structure enables broadband EUV transmission while attenuating the collinear IR by 2 orders of magnitude.In addition,we explore the potential of integrated photonic architectures based on EUV-guiding hollow structures,laying the foundation for a new class of compact,palm-top devices for EUV and soft X-ray applications. 展开更多
关键词 high-order harmonic generation femtosecond laser micromachining hollow waveguides integrated photonic devices ultrafast optics
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Design of a terahertz slotted waveguide array antenna based on photonic crystal 认领 引用
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作者 PAN Wu YE Kuan +3 位作者 ZHANG Zhen LI Renpu QIU Sen HUANG Lei 《Optoelectronics Letters》 EI 2025年第12期705-710,共6页
In this paper,a terahertz slotted waveguide array antenna is designed based on photonic crystal,which can realize efficient radiation of terahertz waves.The electromagnetic wave is fed from the rectangular waveguide a... In this paper,a terahertz slotted waveguide array antenna is designed based on photonic crystal,which can realize efficient radiation of terahertz waves.The electromagnetic wave is fed from the rectangular waveguide at the bottom of the antenna,coupled to photonic crystal waveguide through photonic crystal cavity,and radiated outward through slots at the top layer of antenna.The simulation results show that the antenna achieves a peak gain of 13.45 dBi at 360 GHz,a half-power beam width of 10.9°,and a side lobe level of−13.9 dB.The antenna based on photonic crystal has the advantages of low profile,low loss,and high radiation efficiency,which can be applied to terahertz wireless communication systems. 展开更多
关键词 terahertz slotted waveguide array antenna side lo terahertz electromagnetic wave photonic crystal cavityand photonic crystalwhich rectangular waveguide photonic crystal waveguide
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A triple-band miniaturized end-fire antenna based on odd-mode spoof surface plasmonic polariton waveguide resonator 认领 引用
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作者 BAI Yukun MAO Mengqun 《Optoelectronics Letters》 EI 2025年第8期462-467,共6页
A triple-band miniaturized end-fire antenna based on the odd modes of spoof surface plasmonic polariton(SSPP)waveguide resonator is proposed in this paper.To meet the ever increasing demand for more communication chan... A triple-band miniaturized end-fire antenna based on the odd modes of spoof surface plasmonic polariton(SSPP)waveguide resonator is proposed in this paper.To meet the ever increasing demand for more communication channels and less antenna sizes,multi-band antennas are currently under intensive investigation.By a novel feeding method,three odd modes are excited on an SSPP waveguide resonator,which performs as an end-fire antenna operating at three bands,7.15-7.26 GHz,11.6-12.2 GHz and 13.5-13.64 GHz.It exhibits reasonably high and stable maximum gains of 5.26 dBi,7.97 dBi and 10.1 dBi and maximum efficiencies of 64%,92%and 98%at the three bands,respectively.Moreover,in the second band,the main beam angle shows a frequency dependence with a total scanning angle of 19°.The miniaturized triple-band antenna has a great potential in wireless communication systems,satellite communication and radar systems. 展开更多
关键词 odd modes waveguide resonatorwhich triple band antenna end fire antenna feeding methodthree spoof surface plasmonic polariton sspp waveguide communication channels miniaturized antenna
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Multi-Fano resonances sensing based on a non-through metal-insulatormetal waveguide coupling D-shaped cavity 认领 引用 被引量：2
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作者 ZHAO Xiao-long CHANG Xu-yan +2 位作者 LIU Yan-li ZHANG Yan-Jun ZHANG Zhi-dong 《中国光学（中英文）》 EI CAS CSCD 北大核心 2025年第6期1484-1494,共11页
A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refracti... A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refractive index sensing functionality were simulated using the finite element method(FEM).A multi-Fano resonance phenomenon was clearly observable in the transmission spectra.The Fano resonances observed in the proposed structure arise from the interaction between the discrete states of the Dshaped resonant cavity and the continuum state of the non-through MIM waveguide.The influence of structural parameters on Fano resonance modulation was investigated through systematic parameter adjustments.Additionally,the refractive index sensing properties,based on the Fano resonance,were investigated by varying the refractive index of the MIM waveguide's insulator layer.A maximum sensitivity and FOM of 1155 RIUm and 40 were achieved,respectively.This research opens up new possibilities for designing and exploring high-sensitivity photonic devices,micro-sensors,and innovative on-chip sensing architectures for future applications. 展开更多
关键词 surface plasmon polaritons metal-insulator-metal(MIM)waveguide D-shaped resonant cavity double Fano resonance refractive index sensor
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Unidirectional and robust propagating surface magnetoplasmon in magneto-optical cylindrical waveguides with remanence 认领 引用
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作者 WANG Zhuoyuan CHENG Peihong YU Ping 《Optoelectronics Letters》 EI 2025年第10期577-581,共5页
Ferrimagnetic materials exhibiting remanence can be used to achieve unidirectional electromagnetic-field propagation in the form of magnetoplasmons(MPs)in the subwavelength regime.This study investigates the MP proper... Ferrimagnetic materials exhibiting remanence can be used to achieve unidirectional electromagnetic-field propagation in the form of magnetoplasmons(MPs)in the subwavelength regime.This study investigates the MP properties and various guiding modes in a hollow cylindrical waveguide made of materials that exhibit remanence.Pattern analysis and numerical simulations are used to demonstrate that dispersion relationships and electromagnetic-field distribution are strongly affected by the operating frequency and physical dimensions of the structure.In addition,the existence of two different guiding modes is proved,namely regular and surface-wave modes.By adjusting the operating frequency and reducing the diameter of the hollow cylinder,the regular mode can be suppressed so as to only retain the surface-wave mode,which enables unidirectional MP propagation in the cylindrical waveguide.Moreover,the unidirectional surface-wave mode is robust to backscattering due to surface roughness and defects,which makes it very useful for application in field-enhancement devices. 展开更多
关键词 guiding modes numerical simulations remanence ferrimagnetic materials hollow cylindrical waveguide dispersion relationships ferrimagnetic materials magneto optical cylindrical waveguides unidirectional propagation
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Guiding and magneto–optical properties of TGG waveguide by proton implantation combined with femtosecond laser ablation 认领 引用
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作者 Chun-Xiao Liu Zi-Hao Wang +6 位作者 Bei-Er Guo Rui Yuan Yi-Fan Wang Yu-Hang Zhou Jia-Bin Sun Liao-Lin Zhang Hai-Tao Guo 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第5期437-442,共6页
Integrating the magneto-optical effect into a waveguide-based photonic device becomes more and more interesting.In the work,the planar optical waveguide firstly was prepared in a terbium gallium garnet crystal(TGG)via... Integrating the magneto-optical effect into a waveguide-based photonic device becomes more and more interesting.In the work,the planar optical waveguide firstly was prepared in a terbium gallium garnet crystal(TGG)via the proton implantation with the energy of 4×10-1MeV and the fluence of 6×108ions/μm2.Subsequently,a femtosecond laser with a central wavelength of 800 nm and a power of 3 mW was used to ablate the surface of the planar waveguide,forming the ridge optical waveguide.The dark-mode curve of the planar waveguide was measured by a prism coupling technique.The top-view morphology of the ridge waveguide was observed via a Nikon microscope.The mode field distributions of the planar and ridge waveguides were obtained by an end-face coupling system,and the propagation losses of the two waveguides were measured to be 2.26 dB/cm and 2.58 dB/cm,respectively.The Verdet constants were measured to be-72.7°/T·cm for the TGG substrate and-60.7°/T·cm for the ridge waveguide.The TGG waveguides have a potential in the fabrication of magneto-optical waveguide devices. 展开更多
关键词 optical waveguide ion implantation terbium gallium garnet crystal(TGG) magneto-optical effect femtosecond laser ablation
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Acoustic emission behavior generated from active waveguide during shearing process 认领 引用
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作者 Yang Chen Hongyong Yuan +4 位作者 Lizheng Deng Rui Pan Jianguo Chen Lida Huang Mingzhi Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第10期6571-6585,共15页
Compared to existing deformation monitoring methods,landslide early warning can be achieved by detecting precursor signals of slope instability through acoustic emission(AE).Acquisition of AE signals generated by acti... Compared to existing deformation monitoring methods,landslide early warning can be achieved by detecting precursor signals of slope instability through acoustic emission(AE).Acquisition of AE signals generated by active waveguide facilitates monitoring the development of shear surface and provides a foundation for quantifying landslide movement.Backfill particles are the dominant AE sources in active waveguides,typically chosen from materials such as gravels or sands.However,the influence of particle sizes and gradings has not been clarified in existing laboratory models or field monitoring.This research introduces a direct shear test for active waveguide,where spherical glass beads are employed to precisely regulate the size and grading of backfill particles.A programmable logic controller maintains a constant shearing speed and equivalent total deformation.Through a comprehensive analysis of AE,deformation,and mechanical measurements,this study evaluates the impact of particle size and grading on monitoring capabilities.The findings suggest that the AE mechanism in glass beads is attributed to particle collision and dislocation,leading to AE events characterized by low amplitude and energy levels.The percentage of high-amplitude AE events rises steadily with the progression of shearing.The correlation between shear force,cumulative ring down count(RDC)of AE,and deformation conforms to a power function,with the exponent relying on particle size,grading,and shearing speed.Notably,the combination of small particles and low shearing speeds can yield the maximum cumulative RDC,while selecting particles with uneven grading will significantly enhance the intensity of AE signals from active waveguide. 展开更多
关键词 Landslide monitoring Active waveguide Acoustic emission Direct shear test Particle property
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Structural design of a wide-ridge mid-wave infrared quantum cascade laser based on a supersymmetric waveguide 认领 引用
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作者 DU Shu-Hao ZHENG Xian-Tong +7 位作者 JIA Han CUI Jin-Tao ZHANG Shi-Ya LIU Yuan FENG Yu-Lin ZHANG Chun-Qian LIU Ming ZHANG Dong-Liang 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2025年第3期452-458,共7页
In the process of power scaling large-area Quantum Cascade Lasers(QCLs),challenges such as degradation of beam quality and emission of multilobed far-field modes are frequently encountered.These issues become particul... In the process of power scaling large-area Quantum Cascade Lasers(QCLs),challenges such as degradation of beam quality and emission of multilobed far-field modes are frequently encountered.These issues become particularly pronounced with an increase in ridge width,resulting in multimode problems.To tackle this,an innovative multi ridge waveguide structure based on the principle of supersymmetry(SUSY)was proposed.This structure comprises a wider main waveguide in the center and two narrower auxiliary waveguides on either side.The high-order modes of the main waveguide are coupled with the modes of the auxiliary waveguides through mode-matching design,and the optical loss of the auxiliary waveguides suppresses these modes,thereby achieving fundamental mode lasing of the wider main waveguide.This paper employs the finite difference eigenmode(FDE)method to perform detailed structural modeling and simulation optimization of the 4.6μm wavelength quantum cascade laser,successfully achieving a single transverse mode QCL with a ridge width of 10μm.In comparison to the traditional single-mode QCL(with a ridge width of about 5μm),the MRW structure has the potential to increase the gain area of the laser by 100%.This offers a novel design concept and methodology for enhancing the single-mode luminous power of mid-infrared quantum cascade lasers,which is of considerable significance. 展开更多
关键词 quantum cascade laser mode competition supersymmetry mid-infrared auxiliary waveguides
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Phase controlled single photon transport in giant atoms coupling to one-dimensional waveguide 认领 引用
20
作者 Yan-Yan Song Yao Zang +3 位作者 Yunning Lu Zhao Liu Xiao-San Ma Mu-Tian Cheng 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第12期293-300,共8页
The phase-controlled single-photon transport properties of a giant atom coupled to a one-dimensional waveguide are investigated.The coupling between the giant atom and the waveguide is modeled as a multi-point interac... The phase-controlled single-photon transport properties of a giant atom coupled to a one-dimensional waveguide are investigated.The coupling between the giant atom and the waveguide is modeled as a multi-point interaction.The coupling strengths between the giant atom and the waveguide are represented as complex numbers with associated phases.Analytical expressions for the scattering amplitudes are obtained using the real-space Hamiltonian method.The results show that the characteristics of the scattering spectra,including the positions of peaks(or dips)and the full width at half maximum,can be tuned by adjusting the phase difference between the coupling strengths.Further calculations reveal that the scattering spectra can be either super-broadened or sub-broadened.The conditions for achieving perfect nonreciprocal single-photon transport in the Markovian regime are also discussed.Moreover,we demonstrate the control of single-photon transport through phase differences in the non-Markovian regime.Our results may find applications in the design of quantum devices operating at the single-photon level,based on waveguide quantum electrodynamics. 展开更多
关键词 giant atom waveguide nonreciprocal single photon scattering
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