Coupled surface plasmon-phonon polariton nanocavity arrays for enhanced mid-infrared absorption.

ABSTRACT: Resonant optical cavities are essential components in mid-infrared applications. However, typical film-type cavities require multilayer stacks with a micron-thick spacer due to mid-infrared wavelengths, and their performance is limited by narrow frequency tunability and angular sensitivity. We propose and experimentally demonstrate the subwavelength-scale (≈λ ₀/150) resonant nanocavity arrays that enhance the absorption spectrum of the device in the mid-infrared (10-12 microns) via excitation of coupled surface plasmon-phonon polaritons. The proposed metal-insulator-polar dielectric (gold-silicon-silicon carbide) structure supports a guided mode of the coupled surface polaritons in the lateral direction while vertically confining the mid-infrared wave within the 80 nm thi

SUBMITTER: Kachiraju SR 

PROVIDER: S-EPMC11501734 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature