Zero-biased graphene photodetector with high responsivity integrated into silicon microring resonator.

ABSTRACT: This study presents a dual-core graphene-based waveguide photodetector integrated into a silicon microring resonator to achieve enhanced responsivity. The proposed photodetector operates under zero-bias condition and employs two independent graphene gates to electrostatically induce a pn junction along the graphene channel. Maximum light absorption occurs at the critical coupling point, with a graphene length of 7 μm embedded into the silicon waveguide. The responsivity, bandwidth, and noise equivalent power of 230 V/W, 17.6 GHz, and 43.3 pW/Hz^0.5, respectively, are obtained at λ = 1550 nm. Calculating voltage responsivity instead of current responsivity in the photodetector eliminates the need for transimpedance amplification. Zero-bias operation, low power consumption, and imp

SUBMITTER: Hashemnezhad H 

PROVIDER: S-EPMC12307928 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature