Optimization of a microbolometer pixel for operation in the sub-1 THz region

Date

2021-01-01

Author

Demirörs, Oytun
Atik, Bahar
Dirican, Emrah
Altan, Hakan
Esentürk, Okan
Ylldlrlm, Mustafa
Akın, Tayfun

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Imaging in the Terahertz (THz) region has drawn attention in recent years, but the nature of the THz frequency regime causes some drawbacks in imaging such as long wavelength, high cost, and low emission levels at room temperature. Because of the high atmospheric absorption of THz waves, fabrication of a microbolometer pixel that works in the sub-1 THz frequency regime is necessary. Large pixel pitches due to longer wavelengths and the resulting higher thermal mass pose a difficult challenge. Due to those limitations, a unique design of an absorber is essential for THz microbolometers. This study investigates the use of absorbers based on novel materials and alloys with the goal of developing efficient absorbers in small pixel pitches. First, thin layer metal absorbers typically used in commercial IR microbolometers are characterized in terms of absorption performance in the sub-1 THz region. Thin films based on metal alloys such as TiAlV show a markedly lower absorption in this region than in the IR. To improve the performance of these absorbing layers and reduce pixel pitches. Use of effective media based on the mixture of dielectric materials and metals with patterned thin films are investigated to develop unique absorbing thin layers. It is seen that with the use of an effective medium whose complex dielectric constant is tailored appropriately, efficient absorption of sub-1 THz radiation can be achieved.

Subject Keywords

Terahertz, Absorber, Thin-film, Effective medium, Resonant, Absorption

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85116005021&origin=inward
https://hdl.handle.net/11511/94132

DOI

https://doi.org/10.1117/12.2594067

Conference Name

Terahertz Emitters, Receivers, and Applications XII 2021

Collections

Department of Physics, Conference / Seminar

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Citation Formats

O. Demirörs et al., “Optimization of a microbolometer pixel for operation in the sub-1 THz region,” California, Amerika Birleşik Devletleri, 2021, vol. 11827, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85116005021&origin=inward.