Metasurfaces for suppressing reflection over broadband

TL;DR

This paper demonstrates that quasi-periodic air-hole patterned surfaces with conical profiles can significantly reduce reflection and enhance transmittance over a broad wavelength range of 450-1350 nm, maintaining low reflectance at various angles.

Contribution

It introduces a novel quasi-periodic air-hole pattern with conical depth profiles for broadband antireflection, showing high transmittance and low reflectance in the visible to near-infrared spectrum.

Findings

Average transmittance exceeds 97% at near normal incidence.

Reflectance is maintained below 2% across the tested wavelength range.

Antireflective properties persist up to 30 degrees incidence angle.

Abstract

Surfaces patterned with arrays of quasi-periodic air holes having conical depth profile have been studied for their effectiveness in suppressing air-substrate reflection in the wavelength range of 450-1350 nm (limited by our measurement). The role of quasi-periodic air-hole pattern, depth of holes and launch angle on the observed antireflection behavior are investigated. The average optical transmittance of the patterned quartz substrate at near normal incidence is more than 97% and reflectance is less than 2%. Patterned quartz surfaces with 450 nm thin graded rarefaction region maintain the antireflective property up to 30{\deg} (limited by our measurements) angle of incidence.