Terahertz Gas-Phase Spectroscopy Using a Sub-Wavelength Thick Ultrahigh-Q Microresonator
| Autor: | Rainer Leonhardt, Dominik Walter Vogt, Angus Harvey Jones |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Letter Terahertz radiation 02 engineering and technology lcsh:Chemical technology terahertz spectroscopy 01 natural sciences Biochemistry Analytical Chemistry 010309 optics Quality (physics) 0103 physical sciences Broadband lcsh:TP1-1185 microresonator Electrical and Electronic Engineering Spectroscopy Instrumentation Range (particle radiation) Spectrometer business.industry water vapour sensing 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Terahertz spectroscopy and technology Optoelectronics 0210 nano-technology business Water vapor |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 20, Iss 3005, p 3005 (2020) |
| ISSN: | 1424-8220 |
| Popis: | The terahertz spectrum provides tremendous opportunities for broadband gas-phase spectroscopy, as numerous molecules exhibit strong fundamental resonances in the THz frequency range. However, cutting-edge THz gas-phase spectrometer require cumbersome multi-pass gas cells to reach sufficient sensitivity for trace level gas detection. Here, we report on the first demonstration of a THz gas-phase spectrometer using a sub-wavelength thick ultrahigh-Q THz disc microresonator. Leveraging the microresonator’s ultrahigh quality factor in excess of 120,000 as well as the intrinsically large evanescent field, allows for the implementation of a very compact spectrometer without the need for complex multi-pass gas cells. Water vapour concentrations as low as 4 parts per million at atmospheric conditions have been readily detected in proof-of-concept experiments. |
| Databáze: | OpenAIRE |
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