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19 September 2018 Analysis of the effect of graphene integration on the coupling condition in microresonator
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Evanescent coupling between the waveguides is the most basic and generic configuration in the design of nanophotonic devices. Various photonic devices for light switching, amplification and modulation are based on this phenomenon. Recent years have witnessed an increased attentions towards microresonators due to their compact size and the wide range of possible applications. The coupling between the resonator and waveguide is dependent on the losses inside the microresonator. A switching technique can be realized by bringing the resonator in and out of the critical coupling condition by controlling the losses. Graphene has emerged as a promising candidate for the wide variety of optoelectronic applications. The tunable conductivity of graphene via electrostatic doping makes it a possible choice for modulating the losses in a waveguide. In this paper, we analyze the effect of graphene integration on silicon on insulator (SOI) waveguide. In the telecommunication range, graphene induced losses have been measured that ranges from 0.35 to 0.05 dB/μm for two graphene layers embedded in the waveguide with oxide in between. The graphene coverage length in the ring is selected as a design parameter for waveguide coupled ring resonator system with graphene induced losses affecting the output transmission. The impact of graphene integration length on the Q factor and extinction ratio has been studied, that are key performance metrics for electro-optic applications. With a radius of 4 μm, the microresonator demonstrates an extinction ratio of approximately 15 dB with Q factor decreasing to almost three times due to graphene induced losses for quarter coverage in the ring. The finite-difference time-domain (FDTD) analysis has been used to study the behavior of waveguide and resonator.
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Swati Joshi and Brajesh Kumar Kaushik "Analysis of the effect of graphene integration on the coupling condition in microresonator", Proc. SPIE 10721, Active Photonic Platforms X, 107212D (19 September 2018);

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