Quasi-near field terahertz generation and detection

Journal article (2008)
Department
Imaging Science and Technology (AS) (TU Delft)
Copyright: © 2008 Optical Society of America
DOI: https://doi.org/doi:10.1364/OE.16.012794
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Published Date

07-08-2008

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Source:

Optics Express, 16 (17), 2008

Faculty

Applied Sciences

Department

Imaging Science and Technology

Abstract

We describe a simple terahertz (THz) time domain spectrometer with a bandwidth extending up to 7.5 THz. We show that by keeping the generation and detection crystals close to each other a high signal-to-noise ratio (SNR) can be achieved without using lock-in detection and dry nitrogen flushing. The observed spectra show very good agreement with the spectra calculated based on a simple model which includes phase matching and absorption in the generation and detection crystals. Using this set-up we have measured the absorption lines in D-tartaric acid from 0.5 THz up to 7 THz. We show that the high frequency region > 3 THz is the better choice to measure small changes in the water content of a hygroscopic sample compared to the low frequency region.

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