Effective Electro-Optical Modulation with High Extinction Ratio by a Graphene鈥揝ilicon Microring Resonator

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• 作者：Yunhong Ding ; Xiaolong Zhu ; Sanshui Xiao ; Hao Hu ; Lars Hagedorn Frandsen ; N. Asger Mortensen ; Kresten Yvind
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：15
• 期：7
• 页码：4393-4400
• 全文大小：550K
• ISSN：1530-6992

文摘

Graphene opens up for novel optoelectronic applications thanks to its high carrier mobility, ultralarge absorption bandwidth, and extremely fast material response. In particular, the opportunity to control optoelectronic properties through tuning of the Fermi level enables electro-optical modulation, optical鈥搊ptical switching, and other optoelectronics applications. However, achieving a high modulation depth remains a challenge because of the modest graphene-light interaction in the graphene鈥搒ilicon devices, typically, utilizing only a monolayer or few layers of graphene. Here, we comprehensively study the interaction between graphene and a microring resonator, and its influence on the optical modulation depth. We demonstrate graphene鈥搒ilicon microring devices showing a high modulation depth of 12.5 dB with a relatively low bias voltage of 8.8 V. On鈥搊ff electro-optical switching with an extinction ratio of 3.8 dB is successfully demonstrated by applying a square-waveform with a 4 V peak-to-peak voltage.