Linear absorption coefficient of in-plane graphene on a silicon microring resonator

TL;DR

This paper introduces a method to determine the linear absorption coefficient of graphene on silicon microring resonators using transmission spectra, offering a more precise alternative to traditional methods for optoelectronic device optimization.

Contribution

The study presents a novel optical transmission-based approach to measure graphene's absorption coefficient on silicon microring resonators, independent of coupling efficiency.

Findings

LAC of graphene on silicon microring is about 0.23 dB/um

Method provides accurate measurements unaffected by fiber coupling efficiency

Enables better design of compact, low-power optoelectronic devices

Abstract

We demonstrate that linear absorption coefficient (LAC) of a graphene-silicon hybrid waveguide (GSHW) is determined by the optical transmission spectra of a graphene coated symmetrically coupled add-drop silicon microring resonator (SC-ADSMR), of which the value is around 0.23 dB/um. In contrast to the traditional cut-back method, the measured results are not dependent on the coupling efficiency of the fiber tip and the waveguide. Moreover, precision evaluation of graphene coated silicon microring resonator (SMR) is crucial for the optoelectronic devices targeting for compact footprint and low power consumption.