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High-contrast electrooptic modulation of a photonic crystal nanocavity by electrical gating of graphene

Cornell Affiliated Author(s)

Author

X. Gan
R.-J. Shiue
Y. Gao
K.F. Mak
X. Yao
L. Li
A. Szep
D. Walker
J. Hone
T.F. Heinz
D. Englund

Abstract

We demonstrate high-contrast electro-optic modulation of a photonic crystal nanocavity integrated with an electrically gated monolayer graphene. A silicon air-slot nanocavity provides strong overlap between the resonant optical field and graphene. Tuning the Fermi energy of the graphene layer to 0.85 eV enables strong control of its optical conductivity at telecom wavelengths, which allows modulation of cavity reflection in excess of 10 dB for a swing voltage of only 1.5 V. The cavity resonance at 1570 nm is found to undergo a shift in wavelength of nearly 2 nm, together with a 3-fold increase in quality factor. These observations enable a cavity-enhanced determination of graphene's complex optical sheet conductivity at different doping levels. Our simple device demonstrates the feasibility of high-contrast, low-power, and frequency-selective electro-optic modulators in graphene-integrated silicon photonic integrated circuits. © 2013 American Chemical Society.

Date Published

Journal

Nano Letters

Volume

13

Issue

2

Number of Pages

691-696,

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84873677338&doi=10.1021%2fnl304357u&partnerID=40&md5=f2b1b0dec099b92698817ebdf693d152

DOI

10.1021/nl304357u

Group (Lab)

Kin Fai Mak Group

Funding Source

1106225

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