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Effect of absorber layer placement on absorption coefficient of uncooled microbolometer detectors

ASLI SUDE YORUK1, M. YUSUF TANRIKULU1,*

Affiliation

  1. Department of Electrical-Electronics Engineering, Adana Alparslan Türkeş Science and Technology University, Adana, Turkey

Abstract

This paper investigates the effect of the placement of a thin-film absorber layer on the absorption coefficient of microbolometers. The absorption variation is analyzed by changing the absorber layer position through simulations using the cascaded transmission line model. Relocating the absorber layer increases the absorption coefficient from 69% in the classical design to 85%, which corresponds to a 23% relative increase in detector performance. The novelty of this study lies in the investigation of absorber layer placement, which has not been addressed in previous works. This improvement, achieved by a simple rearrangement of the layer sequence, offers a cost-effective method to enhance microbolometer performance..

Keywords

Thin-film absorber, Microbolometers, Absorption coefficient.

Submitted at: May 22, 2025
Accepted at: Feb. 4, 2026

Citation

ASLI SUDE YORUK, M. YUSUF TANRIKULU, Effect of absorber layer placement on absorption coefficient of uncooled microbolometer detectors, Journal of Optoelectronics and Advanced Materials Vol. 28, Iss. 1-2, pp. 15-19 (2026)