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Graphene-Based Floating-Gate Nonvolatile Optical Switch

Author:
Li, Yan   Yu, Hui   Dai, Tingge   Jiang, Jianfei   Wang, Gencheng   Yang, Longzhi   Wang, Wanjun   Yang, Jianyi   Jiang, Xiaoqing  


Journal:
IEEE Photonics Technology Letters


Issue Date:
2016


Abstract(summary):

We proposed a nonvolatile optical waveguide switch by utilizing a floating-gate (FG) configuration whose FG layer is a single-layer graphene. The switching signal can be removed after the optical switching is accomplished. The propagation state of light then can be retained by charges trapped in the graphene layer until the next erasing signal. Depending on waveforms of driving signals, the device can work as either a phase shifter or an intensity switch. In the phase shifter mode, a 646-μm-long device can achieve a phase shift of π. Corresponding energy consumptions to program/erase, the π phase shift is 82.8 and 118.2 pJ, respectively. In the intensity switch mode, a 328-μm-long device is able to attenuate the light by 20 dB. Energies consumed by the programming and the erasing operations are 35.7 and 45.4 pJ, respectively.



Page:
284-287


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