A wide-angle metamaterial narrow-band-stop filter for 532 nm wavelength green light

TL;DR

This paper introduces a novel wide-angle metamaterial narrow-band-stop filter for 532 nm green light, effectively maintaining spectral properties at large angles of incidence, which is crucial for laser blocking applications.

Contribution

The paper presents the first design of a wide-angle metamaterial narrow-band-stop filter with high angular tolerance for green light at 532 nm.

Findings

Achieves 35-degree angular tolerance at non-normal AOIs.

Effectively inhibits spectrum shift caused by AOI changes.

First report of such a wide-angle filter for 532 nm green light.

Abstract

Traditional optical interference narrow-band-stop filters do not possess wide-angle property, because peaks and troughs of filter spectrum would be moved at a non-normal angle of incidence (AOI), which could result in functional failure in particular cases, e.g. blocking of laser for pilot in cockpit during premeditated laser pointer direct. For this reason, we designed a wide-angle metamaterial narrow-band-stop filter assembled by cross shaped units to block 532 nm green light, which is firstly reported in the world. Unnecessary shift of spectrum caused by AOI change is effectively inhibited, and angular tolerance of wide-angle capability achieves to 35 degrees non-normal AOIs.