Dynamic modulation in graphene-integrated silicon photonic crystal nanocavity*
- 11 January 2021
- journal article
- research article
- Published by IOP Publishing in Chinese Physics B
- Vol. 30 (6), 064209
- https://doi.org/10.1088/1674-1056/abda2b
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 for 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 in excess of five are achieved. A modulation depth (12.8 dB) of the reflection spectra 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.Keywords
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