Perfect near-infrared absorption of graphene with hybrid dielectric nanostructures
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Near-infrared perfect wave harvesting of graphene is theoretically and numerically obtained in a hybrid dielectric configuration without assistance of a reflecting mirror. The absorption is increased 43-fold compared to a suspended graphene layer at normal incidence. The mechanism of perfect absorption is based on critical coupling with a guided resonance introduced by a silicon bar array and Fabry–Perot (FP) effect of a silicon oxide layer. This lossless design is expected to find applications to allow the active area with effective generation and fast transport of photocarriers, paving a new way for on-chip small-footprint ultrahigh responsivity and ultrahigh-speed photodetection in silicon photonics.
This work is supported by the National Key Research and Development Program of China (No. 2016YFE0130000), “Strategic Priority Research Program” of Chinese Academy of Sciences (Grant No. XDB24020400), the Zhejiang Provincial Natural Science Foundation of China (No. LY17F010006), the National Natural Science Foundation of China (No. 61875174).
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