Titanium-based microbolometers

control of spatial profile of terahertz emission in weak power sources

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

Abstract

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.

Keywords

mikrobolometer;teraherčno zaznavanje;teraherčni slikovni sistemi;metoda temnega polja;metoda faznih kontrastov;microbolometer;terahertz sensing;terahertz imaging systems;dark field method;phase contrast method;

Data

Language:	English
Year of publishing:	2020
Typology:	1.01 - Original Scientific Article
Organization:	UL FE - Faculty of Electrical Engineering
UDC:	621.317.794
COBISS:	58940931
ISSN:	2076-3417
Views:	166
Downloads:	61
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	mikrobolometer;teraherčno zaznavanje;teraherčni slikovni sistemi;metoda temnega polja;metoda faznih kontrastov;
Type (COBISS):	Article
Pages:	str. 1-12
Volume:	ǂiss. ǂ10
Issue:	3400
Chronology:	May.-2 2020
DOI:	10.3390/app10103400
ID:	14083834