Dynamic modulation in graphene-integrated silicon photonic crystal nanocavity*

被引:2
作者
Wang, Long-Pan [1 ]
Ren, Cheng [1 ]
Cao, De-Zhong [1 ]
Lan, Rui-Jun [1 ]
Kang, Feng [2 ]
机构
[1] Yantai Univ, Sch Optoelect Informat Sci & Technol, Yantai 264005, Peoples R China
[2] Yantai Univ, Wenjing Coll, Yantai 264005, Peoples R China
基金
中国国家自然科学基金;
关键词
graphene; photonic crystal nanocavity; tunable; CAVITY;
D O I
10.1088/1674-1056/abda2b
中图分类号
O4 [物理学];
学科分类号
0702 ;
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.
引用
收藏
页数:7
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