Advanced MWIR and LWIR band detection and imaging with nanostructured antireflection coating technology

Ashok K. Sood; John W. Zeller; Parminder Ghuman; Sachidananda Babu; Alexander Soibel; David Ting; Sarath Gunapala; Latika S. Chaudhary; Harry Efstathiadis

doi:10.1117/12.2679503

10 October 2023 Advanced MWIR and LWIR band detection and imaging with nanostructured antireflection coating technology

Ashok K. Sood, John W. Zeller, Parminder Ghuman, Sachidananda Babu, Alexander Soibel, David Ting, Sarath Gunapala, Latika S. Chaudhary, Harry Efstathiadis

Author Affiliations +

Proceedings Volume 12687, Infrared Sensors, Devices, and Applications XIII; 1268704 (2023) https://doi.org/10.1117/12.2679503
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

A means of enhancing transmission to enable higher efficiency detector and imaging array performance from ultraviolet (UV) to infrared (IR) bands involves deposition of novel nanostructured optical layers with tunable refractive index properties. This nanostructured antireflection (AR) coating technology provides broadband and omnidirectional suppression of light reflection/scattering to substantially increase transmission. The multilayer AR coatings can be furthermore custom-designed for operation over specific wavebands for a wide range of potential optical applications, particularly for maximizing electro-optic and IR radiation transmission onto the surfaces of detector arrays to greatly enhance sensitivity and efficiency over mid-wave infrared (MWIR) and long-wave infrared (LWIR) bands of detection. Advanced AR nanostructured coatings have been fabricated using a novel growth process and developed for high AR performance, on substrates including GaSb and Si, as well as on GaSb-based focal plane array (FPA) devices, for IR band sensing applications. These nanostructured coatings further minimize reflection losses to provide substantial improvements in increased transmission over thin film AR coating technologies such as quarter wavelength stacks, further enabling higher quantum efficiency and broadband detection of MWIR and LWIR band radiation from the AR-coated optical sensing and FPA imaging devices. Here we review recent developments of this high-performance nanostructured AR coating technology for advancing NASA Earth Science sensing and imaging applications.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Ashok K. Sood, John W. Zeller, Parminder Ghuman, Sachidananda Babu, Alexander Soibel, David Ting, Sarath Gunapala, Latika S. Chaudhary, and Harry Efstathiadis "Advanced MWIR and LWIR band detection and imaging with nanostructured antireflection coating technology", Proc. SPIE 12687, Infrared Sensors, Devices, and Applications XIII, 1268704 (10 October 2023); https://doi.org/10.1117/12.2679503

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