A simple solution for a multilayer metallic optical waveguide by transforming it intoan equivalent three-layer slab waveguide is presented. The dispersion relation of the equivalentthree-layer slab waveguide is solved...A simple solution for a multilayer metallic optical waveguide by transforming it intoan equivalent three-layer slab waveguide is presented. The dispersion relation of the equivalentthree-layer slab waveguide is solved by using a simple iterative formula. This method itself isexact and can approach any accuracy desired. Moreover, the numerical results for four-layer andfive-layer structures show that the second-order solution is also accurate enough. It is simple andhas the same form of expressions for TE and TM modes and for different layer structures.展开更多
This paper reports that Goos-Hǎnchen （GH） shifts occurring on a symmetrical metal-cladding waveguide are experimentally identified. It was found that there exists a critical thickness of the upper metal layer, hcr,...This paper reports that Goos-Hǎnchen （GH） shifts occurring on a symmetrical metal-cladding waveguide are experimentally identified. It was found that there exists a critical thickness of the upper metal layer, hcr, above which negative shift is observed and, reversely, positive shift occurs. Both positive and negative GH shifts near the critical thickness do not vary dramatically and can achieve a maximum on the submillimeter scale, which is different from simulated results using the stationary-phase method. It also shows that this critical thickness, hcr, can be obtained at the position for zero reflectivity by setting the intrinsic damping to be the same as the radiative damping. The GH effects observed near the critical thickness are produced by extreme distortion of the reflected beam profiles, which limits the amplitude of the GH shift and, further, the sensitivity of the GH optical sensor based on the symmetrical metal-cladding waveguide.展开更多
This paper describes the fabrication of a waveguide and the analysis of its polarization characteristics by applying light-emitting diode(LED) pumping lights to its surface.By using double tubed coaxial line(DTCL) mic...This paper describes the fabrication of a waveguide and the analysis of its polarization characteristics by applying light-emitting diode(LED) pumping lights to its surface.By using double tubed coaxial line(DTCL) microwave plasma chemical vapor deposition(MPCVD) equipment,an a-Si:H/SiN multilayer waveguide was fabricated whose thickness could be controlled at nanometer order.The main structural material of the waveguide sample consisted of a combination of layers of amorphous silicon hydrogen and silicon nitrate.Once the sample was ready,another major objective of the experiment was to analyze the polarization characteristics of the fabricated waveguide.The idea of the experiment was to analyze how the waveguide reacts when three types of LED(blue,yellow,and red) are radiated onto its surface.The results showed that the fabrication of the a-Si:H/SiN sample is successful.Most effective transmission results,which accord with the polarization characteristics analysis,were obtained.展开更多
In the optical packet switching network, optical buffer is an important device. Microring resonator optical buffers provide good delay performance and flexibility in design. By cascading multiple microring resonators,...In the optical packet switching network, optical buffer is an important device. Microring resonator optical buffers provide good delay performance and flexibility in design. By cascading multiple microring resonators, higher delay-bandwidth product is obtained, but the requirements of high integration and low dispersion are hard to satisfy simultaneously. Double-slot waveguide was proposed to construct highly integrated racetrack microring resonators in this study. Based on dispersion analysis of the thickness of each layer of a waveguide, the structure ofwaveguide was optimized to reach flat and low dispersion. Average dispersions of straight and 3 μm bend waveguides were 5.1 ps/（nm·km） and 4.4 ps/（nm· km）, respectively. Besides, the additional loss from coupling was greatly reduced when applying proper relative displacement between straight and bend waveguides. Theoretical and design basis provided in this paper will help to develop multi-microring optical buffers in the future.展开更多
A metal-clad planar polymer waveguide refractive index sensor based on epoxy(EPO)polymer materials by using light intensity interrogation at 850 nm is designed.The polymethyl methacrylate(PMMA)material is deployed as ...A metal-clad planar polymer waveguide refractive index sensor based on epoxy(EPO)polymer materials by using light intensity interrogation at 850 nm is designed.The polymethyl methacrylate(PMMA)material is deployed as the low refractive index(RI)buffer layer in order to better couple the optical guided mode and the surface plasmon polaritons(SPP)mode for working in water environment.The effects of the gold film thickness,PMMA buffer layer thickness,waveguide layer thickness,waveguide width,and gold length on the sensor sensing characteristics have been comprehensively studied.Simulation results demonstrate that the normalized transmission increases quasi-linearly with the increment of RI of the analyte from 1.33 to 1.46.The sensitivity is 491.5 dB/RIU,corresponding to a high RI resolution of 2.6×10^(9)RIU.The designed SPP-based optical waveguide sensor is low-cost,wide-range,and high-precision,and has a broad application prospect in biochemical sensing with merits of miniaturization,flexibility,and multiplexing.展开更多
文摘A simple solution for a multilayer metallic optical waveguide by transforming it intoan equivalent three-layer slab waveguide is presented. The dispersion relation of the equivalentthree-layer slab waveguide is solved by using a simple iterative formula. This method itself isexact and can approach any accuracy desired. Moreover, the numerical results for four-layer andfive-layer structures show that the second-order solution is also accurate enough. It is simple andhas the same form of expressions for TE and TM modes and for different layer structures.
基金Project supported by the Research Fund for Selecting and Training Excellent Young Teachers in Universities of Shanghai, Shanghai Municipal Education Commission (Grant No slg08006)"Chen Guang" project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation (Grant No 09CG49)+2 种基金Dawn Project of Education Committee of Shanghai and Shanghai Education Development Foundation (Grant No 08SG48)Innovation Program of Shanghai Municipal Education Commission (Grant No 09YZ221)the Program from Shanghai Committee of Science and Technology, China (Grant Nos 07DZ22026 and 08ZR1415400)
文摘This paper reports that Goos-Hǎnchen （GH） shifts occurring on a symmetrical metal-cladding waveguide are experimentally identified. It was found that there exists a critical thickness of the upper metal layer, hcr, above which negative shift is observed and, reversely, positive shift occurs. Both positive and negative GH shifts near the critical thickness do not vary dramatically and can achieve a maximum on the submillimeter scale, which is different from simulated results using the stationary-phase method. It also shows that this critical thickness, hcr, can be obtained at the position for zero reflectivity by setting the intrinsic damping to be the same as the radiative damping. The GH effects observed near the critical thickness are produced by extreme distortion of the reflected beam profiles, which limits the amplitude of the GH shift and, further, the sensitivity of the GH optical sensor based on the symmetrical metal-cladding waveguide.
基金supported by the Waseda University Undergraduate Fund,Japan, and Malaysia Majlis Amanah Rakyat (MARA) through the MARA Scholarship Foundation
文摘This paper describes the fabrication of a waveguide and the analysis of its polarization characteristics by applying light-emitting diode(LED) pumping lights to its surface.By using double tubed coaxial line(DTCL) microwave plasma chemical vapor deposition(MPCVD) equipment,an a-Si:H/SiN multilayer waveguide was fabricated whose thickness could be controlled at nanometer order.The main structural material of the waveguide sample consisted of a combination of layers of amorphous silicon hydrogen and silicon nitrate.Once the sample was ready,another major objective of the experiment was to analyze the polarization characteristics of the fabricated waveguide.The idea of the experiment was to analyze how the waveguide reacts when three types of LED(blue,yellow,and red) are radiated onto its surface.The results showed that the fabrication of the a-Si:H/SiN sample is successful.Most effective transmission results,which accord with the polarization characteristics analysis,were obtained.
文摘In the optical packet switching network, optical buffer is an important device. Microring resonator optical buffers provide good delay performance and flexibility in design. By cascading multiple microring resonators, higher delay-bandwidth product is obtained, but the requirements of high integration and low dispersion are hard to satisfy simultaneously. Double-slot waveguide was proposed to construct highly integrated racetrack microring resonators in this study. Based on dispersion analysis of the thickness of each layer of a waveguide, the structure ofwaveguide was optimized to reach flat and low dispersion. Average dispersions of straight and 3 μm bend waveguides were 5.1 ps/（nm·km） and 4.4 ps/（nm· km）, respectively. Besides, the additional loss from coupling was greatly reduced when applying proper relative displacement between straight and bend waveguides. Theoretical and design basis provided in this paper will help to develop multi-microring optical buffers in the future.
基金The authors gratefully acknowledge the financial support from the Shandong Provincial Key Research and Development Program(Grant Nos.2018YFJH0702 and 2019JZZY020711)Shandong Postdoctoral Innovation Project,and Qingdao Postdoctoral Applied Research Project.
文摘A metal-clad planar polymer waveguide refractive index sensor based on epoxy(EPO)polymer materials by using light intensity interrogation at 850 nm is designed.The polymethyl methacrylate(PMMA)material is deployed as the low refractive index(RI)buffer layer in order to better couple the optical guided mode and the surface plasmon polaritons(SPP)mode for working in water environment.The effects of the gold film thickness,PMMA buffer layer thickness,waveguide layer thickness,waveguide width,and gold length on the sensor sensing characteristics have been comprehensively studied.Simulation results demonstrate that the normalized transmission increases quasi-linearly with the increment of RI of the analyte from 1.33 to 1.46.The sensitivity is 491.5 dB/RIU,corresponding to a high RI resolution of 2.6×10^(9)RIU.The designed SPP-based optical waveguide sensor is low-cost,wide-range,and high-precision,and has a broad application prospect in biochemical sensing with merits of miniaturization,flexibility,and multiplexing.
