High precision dual-modulation differential terahertz ATR sensor for liquid measurements | Zendy

Xiujun Zheng | Zendy; Thomas Gevart | Zendy; Guilhem Gallot | Zendy

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High precision dual-modulation differential terahertz ATR sensor for liquid measurements

Author(s) -

Xiujun Zheng,

Thomas Gevart,

Guilhem Gallot

Publication year - 2021

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.430324

Subject(s) - terahertz radiation , optics , attenuated total reflection , materials science , terahertz spectroscopy and technology , cascade , dynamic range , modulation (music) , reflection (computer programming) , quantum cascade laser , laser , total internal reflection , optoelectronics , physics , chemistry , infrared , chromatography , acoustics , computer science , programming language

We describe a highly sensitive and stable quantum-cascade-laser-based attenuated total reflection (ATR) terahertz sensor for the detection of very low concentration solutions, using a dual-modulation differential approach and ATR geometry. This sensor offers a very high dynamic range and a long-term stability of 40 dB, which extends the potential of terahertz radiation for the analysis of liquid and biological samples. The performance is illustrated by measurements on standard solutions of ions, sugars, and proteins, for concentrations down to 1 µM.

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