Dynamic modulation in graphene-integrated silicon photonic crystal nanocavity

• 作者: Long-Pan Wang Cheng Ren De-Zhong Cao Rui-Jun Lan Feng Kang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS
• 页码范围: 379-386
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/abda2b

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.