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High-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55??m.

ABSTRACT: Graphene has attracted much attention for the realization of high-speed photodetection for silicon photonics over a wide wavelength range. However, the reported fast graphene photodetectors mainly operate in the 1.55??m wavelength band. In this work, we propose and realize high-performance waveguide photodetectors based on bolometric/photoconductive effects by introducing an ultrathin wide silicon-graphene hybrid plasmonic waveguide, which enables efficient light absorption in graphene at 1.55??m and beyond. When operating at 2??m, the present photodetector has a responsivity of ~70?mA/W and a setup-limited 3?dB bandwidth of >20?GHz. When operating at 1.55??m, the present photodetector also works very well with a broad 3?dB bandwidth of >40?GHz (setup-limited) and a high responsivity of ~0.4?A/W even with a low bias voltage of -0.3?V. This work paves the way for achieving high-responsivity and high-speed silicon-graphene waveguide photodetection in the near/mid-infrared ranges, which has applications in optical communications, nonlinear photonics, and on-chip sensing.

SUBMITTER: Guo J

PROVIDER: S-EPMC7048841 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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High-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm.

Guo Jingshu J Li Jiang J Liu Chaoyue C Yin Yanlong Y Wang Wenhui W Ni Zhenhua Z Fu Zhilei Z Yu Hui H Xu Yang Y Shi Yaocheng Y Ma Yungui Y Gao Shiming S Tong Limin L Dai Daoxin D

Light, science & applications 20200228

Graphene has attracted much attention for the realization of high-speed photodetection for silicon photonics over a wide wavelength range. However, the reported fast graphene photodetectors mainly operate in the 1.55 μm wavelength band. In this work, we propose and realize high-performance waveguide photodetectors based on bolometric/photoconductive effects by introducing an ultrathin wide silicon-graphene hybrid plasmonic waveguide, which enables efficient light absorption in graphene at 1.55 μ ...[more]

PMID: 32140220

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Project description:In this paper, a circular hybrid plasmonic waveguide-fed nano-antenna (CHPWFNA) has been introduced for operating at the standard telecommunication wavelength of 1,550 nm. For the first time, the dispersion relation of a circular hybrid plasmonic waveguide as the feed line of the proposed nano-antenna has been derived, analytically. To verify the accuracy of the analytical solution, two numerical techniques of finite element method (FEM) and finite-difference time-domain (FDTD) method have been used. Numerical results are well-matched with the theoretical ones. The characteristics of the CHPWFNA have been studied by two mentioned methods. The obtained realized gains (directivities) by the FDTD and FEM simulations are 9.03 dB (9.38 dBi) and 10.00 dB (10.32 dBi), respectively, at 1,550 nm wavelength. For on-chip point-to-point wireless link performance, the obtained quality factor by the FDTD method (FEM) is 63.97 (100). The obtained radiation characteristics and link performance reveal that at 1,550 nm, the proposed antenna has the best performance. Besides, the frequency bandwidth of the antenna (185-200 THz) covers the low-loss optical frequency range. Also, paying attention to the laser eye safety is so important. Consequently, the wavelength of 1,550 nm has been chosen as the target wavelength. Moreover, the array configuration has been studied and the directivity and realized gain have been obtained based on the array factor theory and numerical methods, which are agree with each other. The attained realized gain by the FDTD method (FEM) for the considered single row array, at 1,550 nm, is 11.20 dB (11.30 dB). There is a little difference between the numerical results due to the total mesh size, the grid size refinement and the relative error of the numerical methods convergence. Finally, as one of the most important challenges in fabrication is the gold surface quality, we have studied the effect of gold surface roughness and its pentagonal cross section on the antenna performance.

Dataset Information

High-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55??m.

Publications

High-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm.

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