Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power...Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power operation.Finite element method is adopted to investigate the interaction enhancement between the graphene flake and the optical mode.The impact of multilayer graphene on the performance of phase modulator is studied comprehensively.Simulation results show that the modulation efficiency improves with the increment of graphene layer number,as well as the modulation length.The 3-dB bandwidth of around 48 GHz is independent of graphene layer number and length.Compared to modulator with two-or four-layer graphene,the six-layer graphene/silicon nitride waveguide modulator can realizeπphase shift at a low-power consumption of 14 fJ/bit when the modulation length is 240μm.展开更多
A waveguide coupled surface plasmon sensor for detection of liquid with high refractive index(RI)is designed based on polymer materials.The effects of variation of the thickness of the Au film,polymethyl methacrylate(...A waveguide coupled surface plasmon sensor for detection of liquid with high refractive index(RI)is designed based on polymer materials.The effects of variation of the thickness of the Au film,polymethyl methacrylate(PMMA)buffer,and waveguide layer on the sensing performance of the waveguide are comprehensively investigated by using the finite difference method.Numerical simulations show that a thinner gold film gives rise to a more sensitive structure,while the variation of the thickness of the PMMA buffer and waveguide layer has a little effect on the sensitivity.For liquid with high RI,the sensitivity of the sensor increases significantly.When RI of liquid to be measured increases from 1.45 to 1.52,the sensitivity is as high as 4518.14 nm/RIU,and a high figure of merit of 114.07 is obtained.The waveguide coupled surface plasmon RI sensor shows potential applications in the fields of environment,industry,and agriculture sensing with the merits of compact size,low cost,and high integration density.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
基金the National Key Research and Development Program of China(Grant No.2019YFB2203001)the National Natural Science Foundation of China(Grant Nos.61675087,61875069,and 61605057)the Science and Technology Development Plan of Jilin Province,China(Grant No.JJKH20190118KJ).
文摘Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power operation.Finite element method is adopted to investigate the interaction enhancement between the graphene flake and the optical mode.The impact of multilayer graphene on the performance of phase modulator is studied comprehensively.Simulation results show that the modulation efficiency improves with the increment of graphene layer number,as well as the modulation length.The 3-dB bandwidth of around 48 GHz is independent of graphene layer number and length.Compared to modulator with two-or four-layer graphene,the six-layer graphene/silicon nitride waveguide modulator can realizeπphase shift at a low-power consumption of 14 fJ/bit when the modulation length is 240μm.
基金Development Program(Grant Nos.2018YFJH0702 and 2019JZZY020711)Qingdao Postdoctoral Applied Research Project(Grant No.6242007311086).
文摘A waveguide coupled surface plasmon sensor for detection of liquid with high refractive index(RI)is designed based on polymer materials.The effects of variation of the thickness of the Au film,polymethyl methacrylate(PMMA)buffer,and waveguide layer on the sensing performance of the waveguide are comprehensively investigated by using the finite difference method.Numerical simulations show that a thinner gold film gives rise to a more sensitive structure,while the variation of the thickness of the PMMA buffer and waveguide layer has a little effect on the sensitivity.For liquid with high RI,the sensitivity of the sensor increases significantly.When RI of liquid to be measured increases from 1.45 to 1.52,the sensitivity is as high as 4518.14 nm/RIU,and a high figure of merit of 114.07 is obtained.The waveguide coupled surface plasmon RI sensor shows potential applications in the fields of environment,industry,and agriculture sensing with the merits of compact size,low cost,and high integration density.
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.
