High resolution terahertz spectroscopy of a whispering gallery mode bubble resonator using Hilbert analysis Article Swipe

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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 Mechanics Astronomy Artificial intelligence Quantum mechanics

Dominik Walter Vogt , R. Leonhardt ·

YOU? · · 2017 · Open Access · · DOI: https://doi.org/10.1364/oe.25.016860 · OA: W2730080880

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.