中国物理B ›› 2021, Vol. 30 ›› Issue (6): 64209-064209.doi: 10.1088/1674-1056/abda2b

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Dynamic modulation in graphene-integrated silicon photonic crystal nanocavity

Long-Pan Wang(汪陇盼)1, Cheng Ren(任承)1,†, De-Zhong Cao(曹德忠)1, Rui-Jun Lan(兰瑞君)1, and Feng Kang(康凤)2   

  1. 1 School of Opto-Electronic Information Science and Technology, Yantai University, Yantai 264005, China;
    2 Wenjing College, Yantai University, Yantai 264005, China
  • 收稿日期:2020-09-29 修回日期:2021-01-08 接受日期:2021-01-11 出版日期:2021-05-18 发布日期:2021-06-01
  • 通讯作者: Cheng Ren E-mail:cren@ytu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11674273) and the Science and Technology Plan Projects of Colleges and Universities of Shandong Province, China (Grant No. J15LJ52).

Dynamic modulation in graphene-integrated silicon photonic crystal nanocavity

Long-Pan Wang(汪陇盼)1, Cheng Ren(任承)1,†, De-Zhong Cao(曹德忠)1, Rui-Jun Lan(兰瑞君)1, and Feng Kang(康凤)2   

  1. 1 School of Opto-Electronic Information Science and Technology, Yantai University, Yantai 264005, China;
    2 Wenjing College, Yantai University, Yantai 264005, China
  • Received:2020-09-29 Revised:2021-01-08 Accepted:2021-01-11 Online:2021-05-18 Published:2021-06-01
  • Contact: Cheng Ren E-mail:cren@ytu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11674273) and the Science and Technology Plan Projects of Colleges and Universities of Shandong Province, China (Grant No. J15LJ52).

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摘要： Silicon-based electro-optic modulators are the key devices in integrated optoelectronics. Integration of the graphene layer and the photonic crystal (PC) cavity is a promising way of achieving compact modulators with high efficiency. In this paper, a high-quality (Q) acceptor-type PC nanocavity is employed to integrate with a single-layer graphene for realizing strong modulation. Through tuning the chemical potential of graphene, a large wavelength shift of 2.62 nm and a Q factor modulation of larger than 5 are achieved. A modulation depth (12.8 dB) of the reflection spectrum is also obtained. Moreover, the optimized PC nanocavity has a large free spectral range of 131.59 nm, which can effectively enhance the flexibility of the modulator. It shows that the proposed graphene-based PC nanocavity is a potential candidate for compact, high-contrast, and low-power absorptive modulators in integrated silicon chips.

关键词: graphene, photonic crystal nanocavity, tunable

Abstract: Silicon-based electro-optic modulators are the key devices in integrated optoelectronics. Integration of the graphene layer and the photonic crystal (PC) cavity is a promising way of achieving compact modulators with high efficiency. In this paper, a high-quality (Q) acceptor-type PC nanocavity is employed to integrate with a single-layer graphene for realizing strong modulation. Through tuning the chemical potential of graphene, a large wavelength shift of 2.62 nm and a Q factor modulation of larger than 5 are achieved. A modulation depth (12.8 dB) of the reflection spectrum is also obtained. Moreover, the optimized PC nanocavity has a large free spectral range of 131.59 nm, which can effectively enhance the flexibility of the modulator. It shows that the proposed graphene-based PC nanocavity is a potential candidate for compact, high-contrast, and low-power absorptive modulators in integrated silicon chips.

Key words: graphene, photonic crystal nanocavity, tunable

中图分类号:  (Photonic bandgap materials)

  • 42.70.Qs
42.82.Gw (Other integrated-optical elements and systems) 42.25.Bs (Wave propagation, transmission and absorption)