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

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

217
views

0
downloads

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

Suggestions

OpenMETU
Core

Applications in broadband THz spectroscopy towards material studies Türkşen, Zeynep; Altan, Hakan; Department of Physics (2011) The purpose of this work was to construct and analyze a THz time domain spectroscopy (THz-TDS) system by using a nanojoule energy per pulse ultrafast laser (non-amplified ultrafast laser or oscillator) source and a non-linear optical generation method for THz generation. First a THz-TDS system, which uses photoconductive antenna (PCA) method for THz generation, was built to understand the working principles of these types of systems. This THz-TDS system which used PCA for generation and a 2mm thick <110> Zn...
Numerical and experimental investigation on laser damage threshold of highly reflective multilayer thin films Ocak, Mustafa; Sert, Cüneyt; Okutucu Özyurt, Hanife Tuba; Department of Mechanical Engineering (2016) The laser induced temperature distributions on the optical thin films are investigated in this study. Effects of optical design modifications on thermal performance of highly reflective (HR) multilayer thin films are analyzed. Firstly, a conventional 19 layer HR coating is selected as a reference and the laser induced temperature distribution is evaluated on it. Then, alternative HR designs are developed by employing non-quarter wave layers, over coat (OC) layers and two high index materials in the coating ...
Influence of nanoparticle shape on colloidal plasmonic interface properties Sarıgül, Elif; Bek, Alpan; Department of Physics (2014) Nanoparticles bearing free charges, interact very strongly with incoming electromagnetic radiation at certain frequencies called the plasmon resonance frequencies, depending on the size, shape and material properties of the particle and the medium. In order to enhance the light scattering by a two dimensional network of such plasmonic nanoparticles several strategies can be followed. In this thesis, it was pursued the fabrication and characterization of the nanoparticle decorated surfaces by colloidal solut...
Development of Stand-Off Imaging Systems Using Low Cost Plasma Detectors That Work in the GHz to THz Range Altan, Hakan; Pavia, Joao Pedro; Ribeiro, Marco; Şahin, Asaf Behzat; Kuşoğlu-Sarıkaya, Cemre (Springer-Verlag, 2021-05-01) Technologies used to detect mm-wave/Terahertz (THz) radiation range from those that are based on temperature changes, direct/indirect transitions or those that detect through the applied electric field. However, many commercially available detectors have limitations in terms of speed and responsivity and are quite expensive. For these reasons, commercially available indicator lamps which are called glow discharge detectors (GDDs) can be a good alternative since they are low cost and can detect microwave to ...
Implementation and characterization of an absorption filter for on-chip fluorescent imaging Yıldırım, Ender; Arpali, Serap Altay (2017-04-01) Here we present fabrication and characterization of an absorption filter with superior roll-on properties and precisely tunable cut-off wavelengths for fluorescent imaging applications in lab-on-a-chip systems. The filters were fabricated by spinning dye doped photopolymer (Orasol Yellow in Norland Optical Adhesive 60) on glass substrates. The fabrication technique allowed us to precisely tune the cut-off wavelength of the filters. We showed that filters with different cut-off in the range of 386 nm-504 nm ...

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.