Optical-induced dielectric tunability properties of DAST crystal in THz range*

Abstract

The optical-induced dielectric tunability properties of DAST crystal in THz range were experimentally demonstrated. The DAST crystal was grown by the spontaneous nucleation method (SNM) and characterized by infrared spectrum. With the optimum wavelength of the exciting optical field, the transmission spectra of the DAST crystal excited by 532 nm laser under different power were measured by terahertz time-domain spectroscopy (THz-TDS) at room temperature. The transmitted THz intensity reduction of 26 % was obtained at 0.68 THz when the optical field was up to 80 mW. Meanwhile, the variation of refractive index showed an approximate quadratic behavior with the exciting optical field, which was related to the internal space charge field of photorefractive phenomenon in the DAST crystal caused by the photogenerated carrier. A significant enhancement of 13.7 % for THz absorption coefficient occurred at 0.68 THz due to the photogenerated carrier absorption effect in the DAST crystal.

Scattering and absorption characteristics of non-spherical cirrus cloud ice crystal particles in terahertz frequency band*

“…However, the terahertz frequency band is a vital research field for both pure research and its applications. [15][16][17][18] In order to provide a theoretical basis for the detection of non-spherical ice crystals in cirrus clouds, the use of the DDA method to study the scattering characteristics of terahertz non-spherical ice crystal particles is crucial. Therefore, the scattering characteristics of spherical ice crystal particles and water droplets at 94 GHz, 220 GHz, and 340 GHz were calculated using the Mie scattering results as the standard values for the accuracy test.…”