Staff

SIZOV Fedir, project co-director

TSYBRII, Zinoviia
REVA, Volodymyr
GOLENKOV, Oleksandr
GUMENJUK-SICHEVSKA, Joanna
PETRYAKOV, Volodymyr
SAKHNO, Mykola
VUICHYK, Mykola
SVEZHENTSOVA, Kateryna,
SHEVCHIK, Anna
LUCHENKO Angelika

Young staff

	Luchenko Angelika researcher scientific archievements: Download CV
	Shevchik-Shekera Anna junior researcher scientific archievements: Download CV
	Shezhentsova Kateryna researcher scientific archievements: Download CV
	Vuychik Mykola senior researcher scientific archievements: Download CV
	Sakhno Mykola PhD student scientific archievements: Download CV

Equipment

Optical table (non-magnetic) Standa (Lithuania), 1HT-NM

Equipment for microwelding of contacts

Set of radioelectronic components - Сlinotron power supply

Clinotron oscillator, frequency 245-290 GHz

Set of radioelectronic components - TTL modulation extension

Power supply of 140 GHz source

Probe setup for measurements of electrical (current-voltage) characteristics of matrix photodetectors

Vacuum equipment with the magnetron module for coating of metal contacts "WUP-5M"

Photolithography equipment «Lada-Electronica»

Fourier-spectrometer

Non-contact interference 3D profilograph «Mikron-Alpha»

Equipment for vacuum deposition by the "hot wall" method. Equipment allows one to sputter thin films of A2B6 (CdTe, CdZnTe) and A4B6 (PbTe, PbSnTe, SnTe) with thicknesses varying from 5 nm to 3 microns

Setup for image acquisition at mm and sub-mm wavelengths

Setup for measuring electrical characteristics of integrated circuits (or readout schemes of multicomponent detectors)

Atomic force microscope ”FemtoScan“

Ellipsometer

Typical view of one of the chemical laboratories

Creator Flashforge Pro 3D printer

Power source for frequency 70 GHz (pulse duration - 100 ns)

Conferences

8th UK, Europe, China Conference
on Millimetre Waves & Terahertz Technologies

14 – 15 September 2015, Cardiff, UK (event web-site)

There were presented two reports:

• “Uncooled rectifying and resistive type sub-THz direct detection detectors. Upper limit performance” by F. Sizov, A. Golenkov, M. Sakhno, V. Zabudsky, Z. Tsybrii, S. Dvoretskii, N. Mikhailov. download proceedings

• “Modeling of THz Focal Plane Array on Electrically Thick Substrate” by M. Sakhno, J. Gumenjuk-Sichevska, F. Sizov. download proceedings

International Young Scientists
Forum on applied physics

29 of September - 2 of October 2015, Dripropetrovsk, Ukraine (event web-site)

There was presented the report #MTE-5: “Modeling of Printed Antennas on Electrically Thick Subtrate for THz Focal Plane Array” by Mykola Sakhno, J. Gumenjuk-Sichevska, F. Sizov.

Mykola Sakhno, who presented this work, received first place in the section "MICROWAVE & TERAHERTZ ELECTRONICS"

9483 SPIE DSS Conference
“Terahertz Physics, Devices, and Systems IX:
Advanced Applications in Industry and Defense”

22 - 23 of April 2015, Baltimore, Maryland, US (event web-site)

There will be presented the report #9483-27:

• “MCT as sub-terahertz and infrared detector” by Fiodor F. Sizov, Vyacheslav V. Zabudsky, Sergey A. Dvoretsky, Vladimir A. Petryiakov, Aleksandr G. Golenkov, Katerina V. Andreyeva, Zinoviia F. Tsybrii, Anna V. Shevchik-Shekera, Ernesto Dieguez.

Report abstract: Development of infrared and sub-terahertz radiation detectors at the same sensitive elements on the base of mercury-cadmium-telluride (MCT) is reported. Two-color un-cooled and cooled to 78 K narrow-gap MCT semiconductor thin layers, grown by liquid phase epitaxy or molecular beam epitaxy method on high resistivity CdZnTe or GaAs substrates, with bow-type antennas were considered both as sub-terahertz direct detection bolometers and 3 to 10 mkm infrared photoconductors. Their room temperature noise equivalent power (NEP) at frequency ~ 140 GHz and signal-to-noise ratio (S/N) in the spectral sensitivity maximum under the monochromatic (spectral resolution of ~0.1 mkm) globar illumination were reached NEP ~4.5*10^-10 W/Hz^1/2 and S/N~50, respectively.

8th Terahertz Days Conference

31 March - 2 April 2015, Arêches Beaufort (Savoie, France) (event web-site)

There was presented the report:

• “Mercury-Cadmium-Telluride thin layers as sub-THz and IR detectors” by F. Sizov, V. Zabudsky, S. Dvoretskii, V. Petryakov, O. Golenkov, Z. Tsybrii, E. Dieguez, E. Repiso.

Report abstract:: Bi-color un-cooled and cooled to 78 K narrow-gap mercury-cadmium-telluride (MCT) semiconductor thin layers with antennas were considered both as sub-terahertz (sub-THz) direct detection bolometers, and 3 to 10 mkm infrared (IR) photoconductors. Noise equivalent power (NEP) of MCT sub-THz detectors at frequency ~ 140 GHz was estimated as well as its IR response at T = 78 K and 300 K. The characteristics of such bi-color detectors can be controlled and improved by selection of parameters of initial layers and of the antennas configuration. Download full report.

Download full report.

Conference "20th International Conference
on Microwaves, Radar, and
Wireless Communications (MIKON)"

16-18 of June 2014, Gdansk, Poland (event web-site)

There were presented two talks:

• Fiodor Sizov. Invited talk "THz/sub-THz direct detector challenges: rectification and thermal detectors for active imaging" (download presentation)
• Mykola Sakhno. Talk "How to achieve a homogeneous sensitivity in THz detector arrays" (download presentation)

Sakhno Mykola, PhD student of 38 department was awarded the second Prize of European Microwave Association (EuMA). The team of the department congratulates Mykola with bright scientific achievement and wishes him further achievements and accomplishments!

Experiments

CdZnTe samples preliminary investigations

Transmission band edge of CdZnTe bulk crystals measured at 300K
by using Shimadzu UV-3600 two-beam spectrophotometer.

IR transmission spectra of CdZnTe bulk crystals measured at 300K
by using FTIR „Perkin Elmer” Spectrum BXII

2D and 3D AFM images of CdZnTe polished surface
made by using scanning probe microscope “Femtoscan”

Developments

MCT detectors for sub-THz region

To apply MCT layers in sub-THz regions, the detectors with the active area of ~50x25 mkm in size were prepared. The rectangular form of sensitive elements was chosen for increasing the detector resistance of the active area to approach the antenna impedance Z to the values 100…200 Ohm for a bow-tie antenna.

For the sub-THz/THz radiation energy transfer into active area, the antennas with dimensions about the wavelength are used. The design of the detector was improved, as compared with that earlier developed, so that electric contacts were formed outside the antenna to avoid their influence on the detected signal.

Photo of MCT chips assembled on the testing board

Electronic circuit for controlling the current (voltage) bias
and preliminary signal amplification

Electronic circuit for controlling the current (voltage) bias and preliminary signal amplification from the linear arrays was developed. The multichannel system for preliminary signal treatment from the linear arrays was fabricated (Fig. 11). Here the scheme conditionally divided in two parts. The first part specifies the stabilized current for the heating of MCT bolometers. The second part serves as amplifier of the output signal from a bolometer. For obtaining the same signals at the output of receivers the gain of amplifier is controlled.

The multichannel system for preliminary signal treatment from the linear arrays

Optical system
for THz detectors linear arrays

To obtain the image using THz detectors linear arrays, it is important to create an optical system, which allows the focusing of THz radiation into each detector simultaneously. This configuration of optical system reduces the scanning time. For this aim we modelled and manufactured such system which consists of two parts. The first part includes the pair of lenses that focus the radiation on the object, the second ones - on THz detectors. We used for the first pair of lenses spherical and cylindrical ones for obtaining THz radiation distribution in the line. Efficiency of this type of lenses was tested on set-up presented in Fig. 1. The scheme consists of a sub-THz source, lenses, MCT sub-THz detectors, registration system and computer with software.

Fig. 1. Photo of set-up for pair of spherical and cylindrical lenses testing.

The sub-THz source was used as the emitter that generates a continuous, linearly polarized, essentially monochromatic wave at 140 GHz. This scheme was chosen as an intermediate for scanning simulating the illumination in the plane of installation of object.

Manufactured cylindrical lens and spot diagram, created by passing a sub-THz beam through the pair of spherical and cylindrical lenses are presented in Fig. 2-3, respectively. A lens spot diagram is the best overall evaluation for a quick check of image quality. Aspects such as astigmatism, coma, spherical aberration, chromatic aberration and more can be viewed instantly.

Fig. 2. Photo of the lens, made on a computer-controlled lathe. Lens material was PTFE.

 

Fig. 2. Photo of the lens, made with using 3D print. Lens material was ABS.

For all of the lenses presented here, we have chosen a focal length of 25 mm and a diameter of 60 mm, therefore the numerical aperture was 1.2 for all lenses (NA = d/(2 f)). These lenses have unique profile which eliminates monochromatic aberrations. All of the lenses were tested on the manufactured set-up and showed satisfactory quality for THz imaging system. 3D print of the THz lenses has perspective for their using in THz vision systems.

Download more detailed description
of this Optical system

Publications

2015 year publications and proceedings

1. F. Sizov, V. Zabudsky, S. Dvoretskii, V. Petryakov, O. Golenkov, K. Andreyeva, Z. Tsybrii. Two-color detector: Mercury-Cadmium-Telluride as a terahertz and infrared detector, Applied Physics Letters, 106, p. 082104-1 – 182104-4 (2015); doi: 10.1063/1.4913590.

2. Fiodor F. Sizov, Vyacheslav V. Zabudsky, Sergey A. Dvoretsky, Vladimir A. Petryiakov, Aleksandr G. Golenkov, Katerina V. Andreyeva, Zinoviia F. Tsybrii, Anna V. Shevchik-Shekera, Ernesto Dieguez. MCT as sub-terahertz and infrared detector, Proc. SPIE 9483, Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense, 94830V (May 13, 2015); doi: 10.1117/12.2176854.

3. F. Sizov,1V. Zabudsky, S. Dvoretskii, V. Petryakov, O. Golenkov, Z. Tsybrii, E. Dieguez, E. Repiso. Mercury-Cadmium-Telluride thin layers as sub-THz and IR detectors, 8th THz Days - - 31 March – 2 April 2015, Areches, France, p. 135.

4. Fiodor F. Sizov, Vyacheslav V. Zabudsky, Sergey A. Dvoretsky, Vladimir A. Petryiakov, Aleksandr G. Golenkov, Katerina V. Andreyeva, Zinoviia F. Tsybrii, Anna V. Shevchik-Shekera, Ernesto Dieguez. MCT as sub-terahertz and infrared detector, SPIE DSS Conference 9483: Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense, 20-24 April 2015, Baltimore, USA, p. 310.

5. Fedir Sizov, Zinoviia Tsybrii, Vyacheslav Zabudsky, Oleksandr Golenkov, Volodymyr Petryakov, Sergei Dvoretskii. MCT thin layers as sub-terahertz and infrared bi-color detector, Int. Scient. And tech. conf. “Laser technologies. Lasers and their application”, 17-19 June 2015, Truskavets, Ukraine, p.98-100.

6. F. Sizov, A. Golenkov, M. Sakhno, V. Zabudsky,Z. Tsybrii, S. Dvoretskii, N. Mikhailov. Uncooled rectifying and resistive type sub-THz direct detection detectors. Upper limit performance, Proc. of 8th UK, Europe, China Conference on Millimetre Waves & Terahertz Technologies , Cardiff, UK, 14 – 15 September 2015, p.14-17.