Wide-aperture aspherical lens for high-resolution terahertz imaging.
In this paper, we introduce wide-aperture aspherical lens for high-resolution terahertz (THz) imaging. The lens has been designed and analyzed by numerical methods of geometrical optics and electrodynamics. It has been made of high-density polyethylene by shaping at computer-controlled lathe and characterized using a continuous-wave THz imaging setup based on a backward-wave oscillator and Golay detector. The concept of image contrast has been implemented to estimate image quality. According to the experimental data, the lens allows resolving two points spaced at 0.95λ distance with a contrast of 15%. To highlight high resolution in the THz images, the wide-aperture lens has been employed for studying printed electronic circuit board containing sub-wavelength-scale elements. The observed results justify the high efficiency of the proposed lens design.
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Nikita V
0000000325533797
NV
Chernomyrdin
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Maxim E
0000000324476858
ME
Frolov
A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova St. 38, Moscow 119991, Russia.
Sergey P
SP
Lebedev
I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya St. 2-4, Moscow 119991, Russia.
Igor V
IV
Reshetov
A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova St. 38, Moscow 119991, Russia.
Igor E
IE
Spektor
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Viktor L
VL
Tolstoguzov
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Valeriy E
0000000231126285
VE
Karasik
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Alexei M
AM
Khorokhorov
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Kirill I
KI
Koshelev
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Aleksander O
AO
Schadko
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Stanislav O
000000016821904X
SO
Yurchenko
Bauman Moscow State Technical University, 2nd Baumanskaya St. 5, Moscow 105005, Russia.
Kirill I
0000000210670978
KI
Zaytsev