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arXiv · 1311.2080

Enhanced Photodetection in Graphene-Integrated Photonic Crystal Cavity

Ren-Jye Shiue·Xuetao Gan·Yuanda Gao·Luozhou Li·Xinwen Yao·Attila Szep·Dennis Walker, Jr.·James Hone·Dirk Englund
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Abstract

We demonstrate the controlled enhancement of photoresponsivity in a graphene photodetector by coupling to slow light modes in a long photonic crystal linear defect cavity. Near the Brillouin zone (BZ) boundary, spectral coupling of multiple cavity modes results in broad-band photocurrent enhancement from 1530 nm to 1540 nm. Away from the BZ boundary, individual cavity resonances enhance the photocurrent eight-fold in narrow resonant peaks. Optimization of the photocurrent via critical coupling of the incident field with the graphene-cavity system is discussed. The enhanced photocurrent demonstrates the feasibility of a wavelength-scale graphene photodetector for efficient photodetection with high spectral selectivity and broadband response.

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Ren-Jye Shiue, Xuetao Gan, Yuanda Gao, Luozhou Li, Xinwen Yao, Attila Szep, Dennis Walker, Jr., James Hone, Dirk Englund. 2013-11-08. Enhanced Photodetection in Graphene-Integrated Photonic Crystal Cavity. https://doi.org/10.1063/1.4839235

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