| 1. |
- Beiranvand, B., et al.
(author)
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A distributed terahertz metasurface with cold-electron bolometers for cosmology missions
- 2021
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In: Applied Sciences (Switzerland). - : MDPI AG. - 2076-3417. ; 11:10
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Journal article (peer-reviewed)abstract
- We developed and tested a 2D periodic array of cold-electron bolometers arranged into a wideband frequency selective metasurface that absorbs more than 70% of the incident power in the frequency range 100–800 GHz. The array had 10 × 10 unit cells, each containing four bolometers incorporated into a ring. The chip with bolometers was mounted on the back side of the silicon lens without a back-reflector. Preliminary experiments demonstrated voltage responsivity as high as 10 V/W for the current-biased series array. Simulation of the noise performance shows realization of background noise-limited performance with NEP < NEP for the optical power load P > 15 pW. Results of numerical simulation made for the unit cell of the array are presented together with the equivalent diagram based on lumped network elements. The unit cell also was developed numerically to operate in two radiation modes.
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| 2. |
- Kuzmin, Leonid, 1946, et al.
(author)
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Wideband Double-Polarized Array of Cold-Electron Bolometers for OLIMPO Balloon Telescope
- 2021
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In: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 69:3, s. 1427-1432
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Journal article (peer-reviewed)abstract
- In this article, we propose a novel type of a wideband 2-D array of cold-electron bolometers (CEBs) sensitive to both polarizations of the incoming optical signal. This array was developed for osservatorio per il lontano infrarosso e le microonde su pallone orientabile (OLIMPO) balloon telescope with a requirement on bandwidth more than 10%. Sensitivity to both polarization components was achieved by a special meander-type arrangement of orthogonal L/2 dipoles. We present theoretical estimations for the optimal arrangement of 2-D arrays of CEBs, which allows achieving maximum efficiency in a wide band with the lowest noise equivalent power (NEP). A pixel layout with an optimal density of CEBs, sensitive to dual polarizations, and having more than 10% FWHM bandwidth at around 350 GHz was proposed and numerically analyzed. The layout consists of a periodic sparse array of orthogonal dipoles sensitive to both polarization components of the incoming signal. The numerical analysis confirmed that the sparse array is the most promising for a combination of high absorbing efficiency and low noise of the system and satisfying the 10% bandwidth requirements for the OLIMPO instrument. Different combinations of series and parallel connections of bolometers were considered for better noise properties to achieve the photon noise-limited level.
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| 3. |
- Sobolev, Alexander, et al.
(author)
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Ultrawideband Metamaterial-Based Array of Cold-Electron Bolometers
- 2019
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In: Conference Proceedings - 2019 Radiation and Scattering of Electromagnetic Waves, RSEMW 2019. ; , s. 196-199
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Conference paper (peer-reviewed)abstract
- In this report we present the concept of a planar array of cold-electron bolometers, which may potentially absorb 50 to 80 percent of the incident terahertz power with linear polarization in the frequency range 50-800 GHz. The array consists of a periodically arranged unit cells each containing a ring with the four bolometers. The performance of the array unit cell is simulated numerically. The experimentally measured frequency response of the bolometric array with 10×10 unit cells in the frequency range 230-370 GHz is presented. (Abstract)
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