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arXiv · 1211.5946

Polarization Dependent Loss and All-Optical Modulation in Graphene on Suspended Membrane Waveguides

Zhenzhou Cheng·Hon Ki Tsang·Xiaomu Wang·Chi Yan Wong·Xia Chen·Ke Xu·Zerui Shi·Jian-Bin Xu
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Abstract

We observe a strong polarization dependent optical loss of in-plane light propagation in silicon waveguide due to the presence of graphene. Both transverse-electric (TE) and transverse-magnetic (TM) modes are efficiently (~3 dB) coupled to the graphene on suspended membrane waveguides using an apodized focusing subwavelength grating. The TE mode has 7.7 dB less excess optical loss than the TM mode at 1.5 {\mu}m for a 150 {\mu}m long waveguide in good agreement with a theoretical model. All-optical modulation of light is demonstrated. There is also a large thermally induced change in waveguide effective index because of optical absorption in graphene.

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Zhenzhou Cheng, Hon Ki Tsang, Xiaomu Wang, Chi Yan Wong, Xia Chen, Ke Xu, Zerui Shi, Jian-Bin Xu. 2012-11-26. Polarization Dependent Loss and All-Optical Modulation in Graphene on Suspended Membrane Waveguides. https://arxiv.org/abs/1211.5946

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