Titanium-based microbolometers : control of spatial profile of terahertz emission in weak power sources

Minkevičius, Linas (author), Qi, Liang (author), Siemion, Agnieszka (author), Jokubauskis, Domas (author), Sešek, Aleksander (author), Švigelj, Andrej (author), Trontelj, Janez (author), Seliuta, Dalius (author), Kašalynas, Irmantas (author), Valušis, Gintaras (author)

Terahertz (THz) imaging and spectroscopy set-ups require fine optical alignment or precise control of spatial mode profile. We demonstrate universal, convenient and easy-to-use imaging—resonant and broadband antenna coupled ultrasensitive titanium-based—dedicated to accurately adjust and control spatial mode profiles without additional focusing optical components of weak power THz sources. Versatile operation of the devices is shown using different kinds of THz—electronic multiplier sources, optical THz mixer-based frequency domain and femtosecond optoelectronic THz time-domain spectrometers as well as optically pumped molecular THz laser. Features of the microbolometers within 0.15–0.6 THz range are exposed and discussed, their ability to detect spatial mode profiles beyond the antennas resonances, up to 2.52 THz, are explored. Polarization-sensitive mode control possibilities are examined in details. The suitability of the resonant antenna-coupled microbolometers to resolve low-absorbing objects at 0.3 THz is revealed via direct, dark field and phase contrast imaging techniques as well.

• Language: English
• Keywords: microbolometer, terahertz sensing, terahertz imaging systems, dark field method, phase contrast method
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FE - Faculty of Electrical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: 12 str.
• Numbering: Vol. 10, iss. 10, art. 3400
• PID: 20.500.12556/RUL-133712
• UDC: 621.317.794
• ISSN on article: 2076-3417
• DOI: 10.3390/app10103400
• COBISS.SI-ID: 58940931
• Publication date in RUL: 10.12.2021

Record is a part of a journal

• Title: Applied sciences
• Shortened title: Appl. sci.
• Publisher: MDPI
• ISSN: 2076-3417
• COBISS.SI-ID: 522979353

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 14.05.2020

Secondary language

• Language: Slovenian
• Keywords: mikrobolometer, teraherčno zaznavanje, teraherčni slikovni sistemi, metoda temnega polja, metoda faznih kontrastov

Projects

• Funder: EC - European Commission
• Funding programme: European Regional Development Fund
• Project number: 01.2.2-LMT-K-718-01-0047
• Acronym: KOTERA-PLAZA