Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk.

ABSTRACT: Electromagnetic coupling via an evanescent field or radiative wave is a primary characteristic of light, allowing optical signal/power transfer in a photonic circuit but limiting integration density. A leaky mode, which combines both evanescent field and radiative wave, causes stronger coupling and is thus considered not ideal for dense integration. Here we show that a leaky oscillation with anisotropic perturbation rather can achieve completely zero crosstalk realized by subwavelength grating (SWG) metamaterials. The oscillating fields in the SWGs enable coupling coefficients in each direction to counteract each other, resulting in completely zero crosstalk. We experimentally demonstrate such an extraordinarily low coupling between closely spaced identical leaky SWG waveguides, suppressin

SUBMITTER: Kabir MF 

PROVIDER: S-EPMC10238401 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature