Investigation of effective medium absorbers for possible sensing applications in the sub-1 THz region

Download

Oytun Demirörs Tez 5319543731.pdf

Date

2022-9-2

Author

Demirörs, Oytun

Metadata

Show full item record

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

Item Usage Stats

210
views

0
downloads

Imaging in the terahertz (THz) region has receiving great attention in recent years with its very attractive diverse application possibilities from security to health, from bio to material inspection. However, the nature of the THz frequency region brings many challenges to development of sources and sensors for imaging applications. Some of the challenges are requirement of large pixel-pitches, high fabrication and maintenance costs, and low emission levels of the sources at room temperature. Due to the strong atmospheric attenuation of THz waves above 1 THz, it is better to produce a sensing pixel operating in frequencies below 1 THz. Large pixel pitches for long wavelengths and thicker absorber layers due to the low absorption coefficients that result in higher thermal mass causes challenges in microfabrication and, thus, in sensing applications. Because of these limitations, a unique absorber design for the THz region is required to get lighter antenna structures for THz sensors. In this study, with an aim of tuning THz response of absorber and antenna structures, TiAlV periodic elements with various sizes embedded into SixNy films were designed, prepared on p-type silicon substrate, and evaluated using THz time- domain spectroscopy. The designs were supported in silico with Bruggeman Effective Medium Theory simulations. The experimental properties were found to be in agreement with the simulations in part. The deviation is possibly due to the limitation in the making of the model structure and also possibly due to the simplification of the model relative to the experimental structure. Overall, effects of fabrication parameters on the THz response of the thin films are compared and reported. Further optimization of the process flow for appropriate wafer level uniformity is needed for the thin films with higher (around 30%, volumetric) metal content.

Subject Keywords

Absorber, Thin film, Effective medium, Terahertz

URI

https://hdl.handle.net/11511/99597

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Optimization of a microbolometer pixel for operation in the sub-1 THz region Demirörs, Oytun; Atik, Bahar; Dirican, Emrah; Altan, Hakan; Esentürk, Okan; Ylldlrlm, Mustafa; Akın, Tayfun (2021-01-01) 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 l...
Evaluation of [In-111]-Labeled Zinc-Dipicolylamine Tracers for SPECT Imaging of Bacterial Infection Rice, Douglas R.; Plaunt, Adam J.; Türkyılmaz, Serhan; Smith, Miles; Wang, Yuzhen; Rusckowski, Mary; Smith, Bradley D. (2015-04-01) This study prepared three structurally related zinc-dipicolylamine (ZnDPA) tracers with [In-111] labels and conducted biodistribution and single-photon emission computed tomography/computed tomography (SPECT/CT) imaging studies of a mouse leg infection model.
Measuring infiltration in building envelopes Taner Düzyol, Özün; Koç, Havva Elif; Elias Özkan, Soofia Tahira(2013-12-31) Yapı ısıtma yükü ve buna bağlı olarak ısınma maaliyetine etki eden önemli etmenlerden biri de yapı kabuğundan sızan hava miktarıdır (Infiltration). Bu çalışmada amaç bina ısıl performansına etki eden bu faktörün secilen çalışma alanında gerekli cihazlarla ölçüm yapmak ve alınan kayıtların öngörülen yazılım yardımıyla ısıtma enerji analizi hesaplamasına girdi olarak kullanmak ve analiz sonuçlarını bu bağlamda değerlendirmek olacaktır. Çalışma alanı olarak ODTÜ Mimarlık Fakültesi seçilmiştir. Yakın tarihte y...
GROWTH, CHARACTERIZATION AND DEVICE APPLICATIONS OF CADMIUM ZINC TELLURIDE THIN FILMS Doğru Balbaşı, Çiğdem; Parlak, Mehmet; Department of Physics (2022-5-25) CdZnTe is an II-VI group semiconductor material with significant properties used in many critical industrial applications, such as photovoltaic devices, photodiodes, photoconductors, room temperature gamma-ray spectroscopy, X-ray imaging, and infrared detectors. In Particular, CdZnTe is a promising material for solar cell application as an absorber layer due to its direct tunable bandgap property, high atomic number with strong absorption, excellent optoelectronic properties, and long-term stability. Howeve...
Design of a Novel THz Sensor for Structural Health Monitoring Applications Pavia, J. P.; Ribeiro, M. A.; Sarikaya, C. K.; Akbar, D.; Altan, Hakan; Souto, N. (2019-01-01) In this paper, we propose a study on the characterization, design and simulation of a THz sensor for applications in Structural Health Monitoring (SHM). The proposed sensor is assembled using two frequency selective surfaces (FSSs) based on metamaterial wire resonators. We present a theoretical model to describe its electromagnetics which is used not only to understand the physical principles underlying the functioning of the sensor but also to determine a set of optimized parameters for its operation in th...

Citation Formats

O. Demirörs, “Investigation of effective medium absorbers for possible sensing applications in the sub-1 THz region,” M.S. - Master of Science, Middle East Technical University, 2022.