Open AccessTunable optical filter using phase change materials for smart IR night vision applications
Author(s) -
Remona Heenkenda,
Keigo Hirakawa,
Andrew Sarangan
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.440299
Subject(s) - optics , filter (signal processing) , optical filter , phase change , night vision , materials science , reflection (computer programming) , computer science , computer vision , physics , engineering physics , programming language
In this paper we present a tunable filter using Ge 2 Sb 2 Se 4 Te 1 (GSST) phase change material. The design principle of the filter is based on a metal-insulator-metal (MIM) cavity operating in the reflection mode. This is intended for night vision applications that utilize 850nm as the illumination source. The filter allows us to selectively reject the 850nm band in one state. This is illustrated through several daytime and nighttime imaging applications.