Quasi-near field terahertz generation and detection

Optics Express
Reshmi ChakkittakandyPaul C Planken

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.

References

Apr 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·P U JepsenH Helm
Aug 13, 2004·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·J M Chamberlain
Oct 15, 1989·Optics Letters·M ExterD Grischkowsky

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Citations

Apr 3, 2012·The Review of Scientific Instruments·Atsushi NakanishiHironori Takahashi
Sep 1, 2009·Journal of Pharmaceutical Sciences·Reshmi ChakkittakandyPaul C M Planken
May 4, 2011·Analytical Chemistry·Jason B Baxter, Glenn W Guglietta
Sep 26, 2015·Optics Express·Tzu-Fang TsengChi-Kuang Sun
Mar 16, 2012·Optics Express·Gopakumar RamakrishnanKotaro Kajikawa
Aug 14, 2013·Optics Express·Gopakumar RamakrishnanPaul C M Planken
Jun 1, 2015·Biophysics Reviews·Katherine A NiessenA G Markelz

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