Abstract

Fibonacci or bifocal terahertz (THz) imaging is demonstrated experimentally employing a silicon diffractive zone plate in continuous wave mode. Images simultaneously recorded in two different planes are exhibited at 0.6 THz frequency with the spatial resolution of wavelength. Multifocus imaging operation of the Fibonacci lens is compared with a performance of the conventional silicon phase zone plate. Spatial profiles and focal depth features are discussed varying the frequency from 0.3 to 0.6 THz. Good agreement between experimental results and simulation data is revealed.

© 2018 Optical Society of America

Bessel terahertz imaging with enhanced contrast realized by silicon multi-phase diffractive optics

Linas Minkevičius, Domas Jokubauskis, Irmantas Kašalynas, Sergej Orlov, Antanas Urbas, and Gintaras Valušis
Opt. Express 27(25) 36358-36367 (2019)

3D printed diffractive terahertz lenses

Walter D. Furlan, Vicente Ferrando, Juan A. Monsoriu, Przemysław Zagrajek, Elżbieta Czerwińska, and Mieczysław Szustakowski
Opt. Lett. 41(8) 1748-1751 (2016)

Terahertz multilevel phase Fresnel lenses fabricated by laser patterning of silicon

L. Minkevičius, S. Indrišiūnas, R. Šniaukas, B. Voisiat, V. Janonis, V. Tamošiūnas, I. Kašalynas, G. Račiukaitis, and G. Valušis
Opt. Lett. 42(10) 1875-1878 (2017)

Laser-processed diffractive lenses for the frequency range of 4.7 THz

Simonas Indrišiūnas, Heiko Richter, Ignas Grigelionis, Vytautas Janonis, Linas Minkevičius, Gintaras Valušis, Gediminas Račiukaitis, Till Hagelschuer, Heinz-Wilhelm Hübers, and Irmantas Kašalynas
Opt. Lett. 44(5) 1210-1213 (2019)

Diamond diffractive lens with a continuous profile for powerful terahertz radiation

Maxim Komlenok, Taras Kononenko, Dmitry Sovyk, Vladimir Pavelyev, Boris Knyazev, Evgeny Ashkinazi, Anton Reshetnikov, Gennadii Komandin, Vladimir Pashinin, Victor Ralchenko, and Vitaly Konov
Opt. Lett. 46(2) 340-343 (2021)