Carbon Nanotubes-Based Magneto-Optically Tunable Structure for Terahertz Wave Polarization Control
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ANOPHOTONICS
Carbon Nanotubes-Based Magneto-Optically Tunable Structure for Terahertz Wave Polarization Control1 A. Kvitsinskiya, b, *, P. Demchenkoa, b, E. Litvinova, b, M. Masyukova, I. Anoshkina, A. Vozianovaa, and M. Khodzitskya, b, ** a
Terahertz Biomedicine Laboratory, ITMO University, St. Petersburg, 199034 Russia b Center for Bioengineering, ITMO University, St. Petersburg, 197101 Russia * e-mail: [email protected] ** e-mail: [email protected] Received January 18, 2020; revised January 18, 2020; accepted April 20, 2020
Abstract—Terahertz time-domain spectroscopic polarimetry (THz-TDSP) method was used to study of polarization properties of a randomly oriented single-walled carbon nanotube (SWCNT) thin film on a high resistivity monocrystalline silicon (Si) substrate in terahertz (THz) frequency range under an external optical pumping and an external static magnetic field. Frequency dependencies of azimuth and ellipticity angles of a polarization ellipse and the polarization ellipse at various frequencies of the electromagnetic waves transmitted through the Si substrate and the SWCNT on the Si substrate were obtained experimentally based on the solution of the system of the Stokes parameters. The results of the study of this magneto-optically tunable structure confirm the fact that, based on the Faraday effect in the SWCNT, it is possible to devise efficient tunable THz polarization modulators for use in physics, chemistry, medicine, and the latest security and telecommunication systems. Keywords: terahertz time-domain spectroscopic polarimetry, single-walled carbon nanotubes, high resistivity monocrystalline silicon, polarization properties, Stokes parameters, Faraday effect DOI: 10.1134/S0030400X20080214
INTRODUCTION Terahertz (THz) radiation is widely used in physics and astronomy [1–3], chemistry and medicine [4–6], security and telecommunication systems [7–9], and other fields of science and technology [10]. Currently, one of the relevant problems for development of THz photonics is the lack of efficient and affordable tunable under external influences devices for modulating the polarization of an electromagnetic (EM) radiation in the THz frequency range [11–13]. Polarization, amplitude, and frequency modulators are basic components in security and telecommunication systems, for example, for communication between geostationary satellites. The efficient polarization modulators have a fundamental importance for an investigation of properties of novel materials in physics and chemistry. A promising solution to the foregoing problem is a study of carbon nanotubes (CNT) for use as a functional medium in polarizers due to unique optical and electronic properties of these nanomaterials. From a point of view of physics, one of the ways to control 1 The 2nd International School-Conference for young researchers
“Smart Nanosystems for Life,” St. Petersburg, Russia, December 10–13, 2019.
polarization properties of carbon nanomaterials is to use the magneto-optical Faraday effect. In this regard,
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