Terahertz pyroelectric detectors based on tetraaminodiphenyl thin films
V.V. Gerasimov1,2, S.A. Kuznetzov2,3, V.S. Vanda1,2, A.G. Lemzyakov1,4, D.V. Fromichev5,
N.M. Shemyagin5, V.A. Stepanov5 and A.K. Nikitin6
1- Budker Institute of Nuclear Physics of SB RAS, 11, Lavrentiev prospect, 630090, Novosibirsk, Russia
2- Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia
3- Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev Aven., Novosibirsk 630090, Russia
4-Synchrotron Radiation Facility SKIF, 1, pr. Nikolsky, 630559 Kol’tsovo, Russia
5 - Joint Stock Company " Novosibirsk factory of semiconductor devise EAST ", Krasny Ave., 18б Novosibirsk, 630007, Russia
6- Scientific and Technological Centre of Unique Instrum. of RAS, 15, Butlerova str., 117342, Moscow, Russia
Abstract
A technology for fabricating pyroelectric detectors with optimal parameters was developed using nichrome and resistive electrodes deposited by vacuum sputtering methods. Using this technology, a series of prototype pyroelectric detectors were manufactured, and their performance was tested in the spectral range under study. The sensitivity of detectors with optimized parameters of the absorbing MDM structure was found to be more than an order of magnitude higher than that of standard commercial detectors of this type. The speed, noise characteristics, NEP and detection capability of the pyrodetectors were also characterized, surpassing foreign commercial available analogues in the IR and THz ranges, and are comparable with the parameters of other types of uncooled thermal detectors.
To improve the detection efficiency of THz beams measuring tens of millimeters, a miniature polypropylene lens optimized for the THz range was placed instead of the standard flat germanium window. As a result, the beam detection efficiency increased tenfold.
Thus, by optimizing the detection structure and radiation collection optical schema of the TADPh-based pyroelectric detector, its detection capability becomes comparable to that of the Golay cell, the most sensitive uncooled optoacoustic detector in the THz range. Moreover, its response speed exceeds that of the Golay cell by 2-3 orders of magnitude. This makes it a highly promising single-element THz radiation detector for scientific research and different applications.
Speaker
V.V.Gerasimov
Novosibirsk state university
Russia
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