Open AccessHigh resolution terahertz spectroscopy of a whispering gallery mode bubble resonator using Hilbert analysis
Author(s) -
Dominik Walter Vogt,
R. Leonhardt
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.016860
Subject(s) - terahertz radiation , whispering gallery wave , optics , spectrometer , resonator , terahertz spectroscopy and technology , spectroscopy , bubble , continuous wave , whispering gallery , laser , materials science , spectral resolution , resolution (logic) , physics , spectral line , computer science , quantum mechanics , astronomy , mechanics , artificial intelligence
We report on data processing for continuous wave (CW) terahertz (THz) spectroscopy measurements based on a Hilbert spectral analysis to achieve MHz resolution. As an example we investigate the spectral properties of a whispering gallery mode (WGM) THz bubble resonator at critical coupling. The experimental verification clearly demonstrates the significant advantages in relative frequency resolution and required acquisition time of the proposed method over the traditional data analysis. An effective frequency resolution, only limited by the precision and stability of the laser beat signal, can be achieved without complex extensions to a standard commercially available CW THz spectrometer.