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Simultaneous guidance of electromagnetic and elastic waves via glide symmetry phoxonic crystal waveguides
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作者 雷林霖 何灵娟 +2 位作者 廖清华 刘文兴 于天宝 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期363-368,共6页
A phoxonic crystal waveguide with the glide symmetry is designed,in which both electromagnetic and elastic waves can propagate along the glide plane at the same time.Due to the glide symmetry,the bands of the phoxonic... A phoxonic crystal waveguide with the glide symmetry is designed,in which both electromagnetic and elastic waves can propagate along the glide plane at the same time.Due to the glide symmetry,the bands of the phoxonic crystal super-cell degenerate in pairs at the boundary of the Brillouin zone.This is the so-called band-sticking effect and it causes the appearance of gapless guided-modes.By adjusting the magnitude of the glide dislocation the edge bandgaps,the bandgap of the guided-modes at the boundary of the Brillouin zone,can be further adjusted.The photonic and phononic guided-modes can then possess only one mode for a certain frequency with relatively low group velocities,achieving single-mode guided-bands with relatively flat dispersion relationship.In addition,there exists acousto-optic interaction in the cavity constructed by the glide plane.The proposed waveguide has potential applications in the design of novel optomechanical devices. 展开更多
关键词 phoxonic crystals glide symmetry WAVEGUIDE acousto-optic interaction
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Active Cancelation of Acoustic Noise in Waveguides by Standard Control Task Decision Usage
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作者 Alexey A. Pudovkin 《Journal of Applied Mathematics and Physics》 2024年第4期1188-1202,共15页
Cybernetic decision variants were analyzed in order to use for physical task of active noise cancelation. 10 dB mean active noise cancellation is demonstrated in two decades frequency band by usage of cybernetic decis... Cybernetic decision variants were analyzed in order to use for physical task of active noise cancelation. 10 dB mean active noise cancellation is demonstrated in two decades frequency band by usage of cybernetic decision for acoustical duct physical scale model. The used decision was found on minimization of acoustical field power transfer function from the beginning of waveguide to their end. 展开更多
关键词 Waveguide Noise Active Cancelation CONTROL Synthesis Procedure H2
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Fundamentals and applications of photonic waveguides with bound states in the continuum
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作者 Zejie Yu He Gao +4 位作者 Yi Wang Yue Yu Hon Ki Tsang Xiankai Sun Daoxin Dai 《Journal of Semiconductors》 EI CAS CSCD 2023年第10期11-24,共14页
Photonic waveguides are the most fundamental element for photonic integrated circuits(PICs).Waveguide properties,such as propagation loss,modal areas,nonlinear coefficients,etc.,directly determine the functionalities ... Photonic waveguides are the most fundamental element for photonic integrated circuits(PICs).Waveguide properties,such as propagation loss,modal areas,nonlinear coefficients,etc.,directly determine the functionalities and performance of PICs.Recently,the emerging waveguides with bound states in the continuum(BICs)have opened new opportunities for PICs because of their special properties in resonance and radiation.Here,we review the recent progress of PICs composed of waveguides with BICs.First,fundamentals including background physics and design rules of a BIC-based waveguide will be introduced.Next,two types of BIC-based waveguide structures,including shallowly etched dielectric and hybrid waveguides,will be presented.Lastly,the challenges and opportunities of PICs with BICs will be discussed. 展开更多
关键词 photonic waveguide bound states in the continuum integrated photonics
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Low-Microwave Loss Coplanar Waveguides Fabricated on High-Resistivity Silicon Substrate 被引量:1
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作者 杨华 朱洪亮 +3 位作者 谢红云 赵玲娟 周帆 王圩 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第1期1-4,共4页
Three kinds of coplanar waveguides (CPWs) are designed and fabricated on different silicon substrates---common low-resistivity silicon substrate (LRS), LRS with a 3μm-thick silicon oxide interlayer, and high-resi... Three kinds of coplanar waveguides (CPWs) are designed and fabricated on different silicon substrates---common low-resistivity silicon substrate (LRS), LRS with a 3μm-thick silicon oxide interlayer, and high-resistivity silicon (HRS) substrate. The results show that the microwave loss of a CPW on LRS is too high to be used, but it can be greatly reduced by adding a thick interlayer of silicon oxide between the CPW transmission lines and the LRS.A CPW directly on HRS shows a loss lower than 2dB/cm in the range of 0-26GHz and the process is simple,so HRS is a more suitable CPW substrate. 展开更多
关键词 coplanar waveguides high-resistivity silicon microwave loss high frequency optoelectronic packaging
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Optimization of Plasma Etching Parameters and Mask for Silica Optical Waveguides 被引量:1
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作者 周立兵 刘文 吴国阳 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第6期1104-1110,共7页
Optical waveguides in silica-on-silicon are one of the key elements in optical communications.The processes of deep etching silica waveguides using resist and metal masks in RIE plasma are investigated.The etching res... Optical waveguides in silica-on-silicon are one of the key elements in optical communications.The processes of deep etching silica waveguides using resist and metal masks in RIE plasma are investigated.The etching responses,including etching rate and selectivity as functions of variation of parameters,are modeled with a 3D neural network.A novel resist/metal combined mask that can overcome the single-layer masks’ limitations is developed for enhancing the waveguides deep etching and low-loss optical waveguides are fabricated at last. 展开更多
关键词 reactive ion etching silica-on-silicon optical waveguides 3D neural network
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An Efficient MMI SOI Splitter with Multimode Input/Output Waveguides
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作者 方青 贺月娇 +2 位作者 辛红丽 李芳 刘育梁 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第2期276-280,共5页
A 1×8 multimode interference power splitter with multimode input/output waveguides in SOI material is designed by the beam propagation method and fabricated by the inductive coupled plasma etching technology for... A 1×8 multimode interference power splitter with multimode input/output waveguides in SOI material is designed by the beam propagation method and fabricated by the inductive coupled plasma etching technology for use in fiber optics communication systems.The fabricated device exhibits low loss and good coupling uniformity.The excess loss is lower than 0 8dB,and the uniformity is 0 45dB at the wavelength of 1550nm.Moreover,the polarization dependent loss is lower than 0 7dB at 1550nm.The device size is only 2mm×10mm. 展开更多
关键词 multimode interference power splitter SOI multimode input/output waveguides
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Multimode Interference Optical Power Splitter in Proton-Exchange LiNbO_3 Waveguides
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作者 马慧莲 王明华 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2003年第2期137-140,共4页
The self imaging effect in graded index waveguides using annealed proton exchange (APE) technique in lithium niobate (LiNbO 3) waveguides is analyzed and simulated using the three dimensional nonparaxial beam pro... The self imaging effect in graded index waveguides using annealed proton exchange (APE) technique in lithium niobate (LiNbO 3) waveguides is analyzed and simulated using the three dimensional nonparaxial beam propagation method (BPM).On this basis,a 1×8 multimode interference (MMI) optical power splitter by APE technique in X cut LiNibO 3 with Y propagation substrate is fabricated.Measurements show that the device has realized eight powers splittings. 展开更多
关键词 MMI optical power splitter nonparaxial BPM APE LiNbO 3 waveguides
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Revised RPS Method for Complex Solution of Multimode Slab Waveguides with Metal layers
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作者 LIJian-jun SHENGuang-di 《Semiconductor Photonics and Technology》 CAS 2004年第3期190-193,共4页
The RPS method,which integrates the real numerical solution, the perturbation solution and the shooting solution reasonably,can obtain the complex solution of a slab waveguide with small gain/loss regions without sear... The RPS method,which integrates the real numerical solution, the perturbation solution and the shooting solution reasonably,can obtain the complex solution of a slab waveguide with small gain/loss regions without searching the root in the entire complex plan.A revision to the RPS method is presented so that it can deal with the waveguide including large gain/loss regions.The application indicated that the simulation results are precise. 展开更多
关键词 Optical waveguides Slab waveguides Simulation RPS method
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A low-threshold nanolaser based on hybrid plasmonic waveguides at the deep subwavelength scale 被引量:7
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作者 李志全 朴瑞琦 +2 位作者 赵晶晶 孟晓云 童凯 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期441-447,共7页
A novel nanolaser structure based on a hybrid plasmonic waveguide is proposed and investigated. The coupling between the metal nanowire and the high-index semiconductor nanowire with optical gain leads to a strong fie... A novel nanolaser structure based on a hybrid plasmonic waveguide is proposed and investigated. The coupling between the metal nanowire and the high-index semiconductor nanowire with optical gain leads to a strong field enhancement in the air gap region and low propagation loss, which enables the realization of lasing at the deep subwavelength scale.By optimizing the geometric parameters of the structure, a minimal lasing threshold is achieved while maintaining the capacity of ultra-deep subwavelength mode confinement. Compared with the previous coupled nanowire pair based hybrid plasmonic structure, a lower threshold can be obtained with the same geometric parameters. The proposed nanolaser can be integrated into a miniature chip as a nanoscale light source and has the potential to be widely used in optical communication and optical sensing technology. 展开更多
关键词 surface plasmon hybrid plasmonic waveguides nanolasers
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Circular cladding waveguides in Pr:YAG fabricated by femtosecond laser inscription:Raman,luminescence properties and guiding performance 被引量:5
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作者 Quanxin Yang Hongliang Liu +3 位作者 Shan He Qingyu Tian Bin Xu Pengfei Wu 《Opto-Electronic Advances》 SCIE 2021年第2期12-18,共7页
We report on the fabrication of circular cladding waveguides with cross-section diameters of 60−120μm in Pr:YAG crystal by applying femtosecond laser inscription.The fabricated waveguides present 2D guidance on the c... We report on the fabrication of circular cladding waveguides with cross-section diameters of 60−120μm in Pr:YAG crystal by applying femtosecond laser inscription.The fabricated waveguides present 2D guidance on the cross-section and fairly low propagation losses.Multiple high-order guiding modes are observed in waveguides with different diameters.Corresponding simulation results reveal the origin of a specific kind of guiding modes.Confocal micro-Raman(μ-Raman)experiments demonstrate the modification effects in femtosecond laser affected areas and ascertain the refractive index induced guiding mechanism.In addition,luminescence emission properties of Pr3+ions at waveguide volume are well preserved during the femtosecond laser inscription process,which may result in a potential high-power visible waveguide laser. 展开更多
关键词 femtosecond laser inscription cladding waveguides Pr:YAG crystal luminescence emission
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Single Photon Scattering in a Pair of Waveguides Coupled by a Whispering-Gallery Resonator Interacting with a Semiconductor Quantum Dot 被引量:2
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作者 程木田 叶根龙 +1 位作者 纵卫卫 马小三 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第2期47-50,共4页
The single photon scattering properties in a pair of waveguides coupled by a whispering-gallery resonator in- teracting with a semiconductor quantum dot are investigated theoretically. The two waveguides support four ... The single photon scattering properties in a pair of waveguides coupled by a whispering-gallery resonator in- teracting with a semiconductor quantum dot are investigated theoretically. The two waveguides support four possible ports for an incident single photon. The quantum dot is considered a V-type system. The incident direction-dependent single photon scattering properties are studied and equal-output probability from the four ports for a single photon incident is discussed. The influences of backscattering between the two modes of the whispering-gallery resonator for incident direction-dependent single photon scattering properties are also pre- sented. 展开更多
关键词 of is from in Single Photon Scattering in a Pair of waveguides Coupled by a Whispering-Gallery Resonator Interacting with a Semiconductor Quantum Dot mode with by
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Nonlinear effect induced in thermally poled glass waveguides 被引量:1
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作者 REN Yi-tao 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第1期105-108,共4页
Thermally poled germanium-doped channel waveguides are presented. Multilayer waveguides containing a silicon oxynitride layer were used as charge trapper in this investigation on the effect of the internal field insid... Thermally poled germanium-doped channel waveguides are presented. Multilayer waveguides containing a silicon oxynitride layer were used as charge trapper in this investigation on the effect of the internal field inside the waveguide. Compared to waveguides without the trapping layer, experimental results showed that the induced linear electro-optic (EO) coefficient increases about 20% after poling, suggesting strongly that the internal field is relatively enhanced, and showed it is a promising means for improving nonlinearity by poling in waveguides. 展开更多
关键词 Electro-optic (EO) effect waveguides GLASS POLING
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Numerical Analysis of Multilayer Waveguides Using Effective Refractive Index Method 被引量:1
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作者 GAOShao-Wen CAOJun-Cheng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第3期327-330,共4页
With the help of the effective refractive index method we have numerically analyzed a multilayer planar waveguide structure and calculated the propagation constants, confinement factors, and transverse electric (TE) m... With the help of the effective refractive index method we have numerically analyzed a multilayer planar waveguide structure and calculated the propagation constants, confinement factors, and transverse electric (TE) modes. A five-layer waveguide model has been provided to analyze the electro-magne tic wave propagation process. The analysis method has been applied to the 980 nm laser with active layer of GaInAs/GaInAsP strained quantum wells, GaInAsP confinement layers and GaInP cap layers. By changing the thickness of confinement layers, we obtained confinement factor as high as 95% with higher TE modes TE1 and TE2. The results are in good agreement with the experiment by A. Al-Muhanna et al. and give the new idea to enhance output power of semiconductor lasers. The analysis method can also be extended to any other slab multilayer waveguide structures, and the results are useful to the fabrication of optic-electronic devices. 展开更多
关键词 multilayer waveguides semiconductor laser
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Supercontinuum Generation in Lithium Niobate Ridge Waveguides Fabricated by Proton Exchange and Ion Beam Enhanced Etching 被引量:1
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作者 Bing-Xi Xiang Lei Wang +3 位作者 Yu-Jie Ma Li Yu Huang-Pu Han Shuang-Chen Ruan 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第2期34-38,共5页
We report on the fabrication of the lO-mm-long lithium niobate ridge waveguide and its supercontinuum gen- eration at near-visible wavelengths (around 800hm). The waveguides are fabricated by a combination of MeV co... We report on the fabrication of the lO-mm-long lithium niobate ridge waveguide and its supercontinuum gen- eration at near-visible wavelengths (around 800hm). The waveguides are fabricated by a combination of MeV copper ion implantation followed by wet etching in a proton exchanged lithium niobate planar waveguide. Using a mode-locked Ti:sapphire laser with a central wavelength of 800nm, the generated broadest supereontinuum through the ridge waveguides spans 302 nm (at -30 dB points), from 693 to 995 nm. Temporal coherence proper- ties of the supercontinuum are experimentally studied by a Michelson interferometer and the coherence length of the broadest supercontinuum is measured to be 5.2 μm. Our results offer potential for a compact and integrated supercontinuum source for applications including bio-imaging, spectroscopy and optical communication. 展开更多
关键词 LENGTH Supercontinuum Generation in Lithium Niobate Ridge waveguides Fabricated by Proton Exchange and Ion Beam Enhanced Etching
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Fabrication and Evaluation of Bragg Gratings on Optimally Designed Silicon-on-Insulator Rib Waveguides Using Electron-Beam Lithography
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作者 武志刚 张伟刚 +5 位作者 王志 开桂云 袁树中 董孝义 宇高胜之 和田恭雄 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第8期1347-1350,共4页
The fabrication of Bragg gratings on silicon-on-insulator (SOI) rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental ... The fabrication of Bragg gratings on silicon-on-insulator (SOI) rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental and theoretical evaluations of the Bragg grating are demonstrated. By thinning the SOl device layer and deeply etching the Bragg grating, a large grating coupling coefficient of 30cm^-1 is obtained. 展开更多
关键词 integrated optics Bragg grating SILICON-ON-INSULATOR rib waveguide
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SOI Waveguides Fabricated by Wet-Etching Method
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作者 王小龙 严清峰 +2 位作者 刘敬伟 陈少武 余金中 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2003年第10期1025-1029,共5页
SOI waveguides fabricated by wet-etching method are demonstrated.The single mode waveguide and 1×2 3dB MMI splitter are analyzed and designed by three dimensional beam propagation method to correct the error of e... SOI waveguides fabricated by wet-etching method are demonstrated.The single mode waveguide and 1×2 3dB MMI splitter are analyzed and designed by three dimensional beam propagation method to correct the error of effective index method and guided mode method.The devices are fabricated.Excellent performances,such as low propagation loss of -1.37dB/cm,low excess loss of -2.2dB,and good uniformity of 0.3dB,are achieved. 展开更多
关键词 SOI wet-etching multimode interference single mode waveguide
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Design of a Broadband E-Plane Power Combiner Based on Quarter-Arc Bent Rectangular Waveguides for Sub-THz and THz Wave
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作者 唐效频 杨梓强 +1 位作者 史宗君 兰峰 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第8期135-138,共4页
A method of designing an E-plane power combiner composed of two quarter-arc bent rectangular waveguides is proposed for sub-THz and THz waves. The quarter-arc bent-waveguide power combiner has a simple geometry which ... A method of designing an E-plane power combiner composed of two quarter-arc bent rectangular waveguides is proposed for sub-THz and THz waves. The quarter-arc bent-waveguide power combiner has a simple geometry which is easy to design and fabricate. By HFSS codes, the physical mechanism and performance of the power combiner are analyzed, and the relationship between the output characteristics and the structure/operating parameters is given. Simulation results show that our power combiner is suitable for the combining of two equalpower and reversed-phase signals, the bandwidth of the combiner is wide and can be adjusted by the radius of the quarter-arc, and the isolation performance of the combiner can be improved by adding thin film resistive septa at the junction of two quarter-arc bent waveguides. Meanwhile, an approximate method based on the analytic geometrical analysis is given to design this power combiner for different frequency bands. 展开更多
关键词 of in is THZ Design of a Broadband E-Plane Power Combiner Based on Quarter-Arc Bent Rectangular waveguides for Sub-THz and THz Wave for on
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Analysis and engineering of coupled cavity waveguides based on coupled-mode theory
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作者 林旭升 陈雄文 兰胜 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第10期2033-2040,共8页
The analytical expression for the transmission spectra of coupled cavity waveguides (CCWs) in photonic crystals (PCs) is derived based on the coupled-mode theory (CMT). Parameters in the analytical expression ca... The analytical expression for the transmission spectra of coupled cavity waveguides (CCWs) in photonic crystals (PCs) is derived based on the coupled-mode theory (CMT). Parameters in the analytical expression can be extracted by simple numerical simulations. We reveal that it is the phase shift between the two adjacent PC defects that uniquely determines the flatness of the impurity bands of CCWs. In addition, it is found that the phase shift also greatly affects the bandwidth of CCWs. Thus, the engineering of the impurity bands of CCWs can be realized through the adjustment of the phase shift. Based on the theoretical results, an interesting phenomenon in which a CCW acts as a single PC defect and its impurity band possesses a Lorentz lineshape is predicted. Very good agreement between the analytical results and the numerical simulations based on transfer matrix method has been achieved. 展开更多
关键词 photonic crystals coupled cavity waveguides coupled-mode theory phase shift
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The Transmission Modes and Losses of the Poled Nano-crystal and Polymer Composite PbTiO_3 / PEK-c Thin-film Waveguides
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作者 任诠 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第1期66-69,共4页
Composite thin films of PbTiO3 nano-crystals and high transparency polymer polyetherketone (PEK-c) for application of non-linear optical devices were prepared by spin coating. The size of PbTiO3 nano-crystals was es... Composite thin films of PbTiO3 nano-crystals and high transparency polymer polyetherketone (PEK-c) for application of non-linear optical devices were prepared by spin coating. The size of PbTiO3 nano-crystals was estimated to be 30-40 nm using a transmission electron microscope. The refractive index and the mode propagation losses at 633 nm were measured using the prism coupling technique and improved photographic technique respectively. They were found to be 1.6545 and 2.00 dB cm^-1 (fundamental mode),respectively. Moreover, it is observed that this loss is increased at higher mode indices. 展开更多
关键词 optical properties NANO-CRYSTALS thin-film waveguides mode propagation losses
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Phase-matched second-harmonic generation in hybrid polymer-LN waveguides
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作者 Zijie Wang Bodong Liu +1 位作者 Chunhua Wang Huakang Yu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第10期171-176,共6页
Here we propose a hybrid polymer-LN waveguide for achieving phase-matched second-harmonic generation(SHG).From the aspect of super-mode theory,the geometric parameters of the hybrid semi-nonlinear waveguide were optim... Here we propose a hybrid polymer-LN waveguide for achieving phase-matched second-harmonic generation(SHG).From the aspect of super-mode theory,the geometric parameters of the hybrid semi-nonlinear waveguide were optimized to utilize both symmetric(even)and antisymmetric(odd)modes of the pump and SHG waves so as to facilitate phase matching with large modal overlap.Phase matching between a fundamental even(TE_(00)-like)mode at 1320 nm and a fundamental odd(TE_(01)-like)mode at 660 nm was found with a calculated modal overlap integral of 0.299,while utilizing the largest nonlinear coefficient d_(33),and achieving an efficient calculated normalized conversion efficiency of 148%W^(-1)·cm^(-2).Considering the fabrication feasibility of such hybrid waveguide with features including etchless,large dimension,and low structural sensitivity,we believe our findings would provide a useful reference for future on-chip efficient nonlinear conversion devices. 展开更多
关键词 nonlinear waveguides super-mode theory phase matching second harmonic generation
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