High-resolution terahertz spectroscopy with a noise radiation source based on high-Tc superconductors. (19th December 2016)

• Record Type: Journal Article
• Authors: Sobakinskaya, E; Vaks, V L; Kinev, N; Ji, M; Li, M Y; Wang, H B; Koshelets, V P
• Is Part Of: Journal of physics. Volume 50:Number 3(2017)
• Publication Date: 2016-12-19
• Subjects: THz spectroscopy -- high-resolution spectra -- stochastic fields -- phase-diffusion field -- superconductors; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/50/3/035305
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Stochastic fields can play a 'constructive' role in their interaction with quantum systems. In this paper, we demonstrate that the phase-diffusion field (PDF) in the terahertz range (THz) induces macroscopic polarization in molecular gas. We explain the observed effect using a simple model in which the PDF is treated as a series of ultrashort pulses of a regular signal, resulting in transient absorption in molecular gas. The experimental investigation of this effect is carried out using ammonia, and the PDF is generated by an oscillator based on stacks of Bi2 Sr2 CaCu2 O8 intrinsic Josephson junctions. These radiation sources do not require a phase-lock loop system to provide high resolution, which simplifies the spectrometer considerably. The PDF radiation sources open up new horizons for the development of compact high-resolution THz spectrometers and applications thereof.