Open AccessTerahertz waves polarization rotation in photoexcited single-wall carbon nanotube thin film
Author(s) -
Anatoly Kvitsinskiy,
Petr Demchenko,
Mikhail G. Novoselov,
Ilya V. Anoshkin,
K. V. Bogdanov,
А. В. Баранов,
Mikhail K. Khodzitsky
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1695/1/012097
Subject(s) - terahertz radiation , materials science , carbon nanotube , polarization (electrochemistry) , polarizer , optics , azimuth , wavelength , optoelectronics , birefringence , physics , nanotechnology , chemistry
Terahertz time-domain spectroscopic polarimetry (THz-TDSP) method was used to experimental study polarization properties of unaligned single-wall carbon nanotube thin films with di˙erent geometric parameters on transparent float glass substrates in a frequency range from 0.2 THz to 0.8 THz (corresponding to a wavelength range from ∼1.50 mm to ∼0.37 mm) at a controlled room temperature of 291–293 K, and a relative humidity of 40–45 %. Frequency dependences of azimuth and ellipticity angles of a polarization ellipse (PE) of electromagnetic waves transmitted through the samples, and PEs at the frequencies of 0.2 THz, 0.5 THz, and 0.8 THz were obtained for values of 0.2 Wcm − 2, 0.6 Wcm − 2, and 1.0 Wcm − 2 of an external 980 nm near infrared optical pumping, with an external static magnetic field of ∼0.3 T. Polarization properties were calculated from temporal waveforms of signals transmitted through the samples at the parallel and the crossed by 45° positions to a transmission direction of the polarizers. A change of 15° in the azimuth angle, and of 10° in the ellipticity angle was achieved. The results show that by using carbon nanomaterials-based structures it is possible to devise efficient and affordable magneto-optically tunable polarization modulators that can be used in the advanced areas of terahertz nanoscience and nanotechnologies.