Fabry-Perot interferometer for sensing polar liquids at terahertz frequencies

被引：12

作者：

Jahn, David ^{[1
,2
]}

Soltani, Amin ^{[1
,2
]}

Balzer, Jan C. ^{[1
,2
]}

Withayachumnankul, Withawat ^{[3
]}

Koch, Martin ^{[1
,2
]}

机构：

[1] Philipps Univ Marburg, Fac Phys, Renthof 5, D-35032 Marburg, Germany

[2] Philipps Univ Marburg, Mat Sci Ctr, Renthof 5, D-35032 Marburg, Germany

[3] Univ Adelaide, Sch Elect & Elect Engn, Adelaide, SA 5005, Australia

来源：

JOURNAL OF APPLIED PHYSICS | 2017年 / 121卷 / 20期

关键词：

TIME-DOMAIN SPECTROSCOPY; THZ REFLECTION SPECTROSCOPY; WAVE GENERATION; WATER; TEMPERATURE; RELAXATION; CHIPS; GUIDE;

D O I：

10.1063/1.4983780

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We propose and validate a sensor for polar liquids that operates in conjunction with terahertz time-domain spectroscopy. The sensor is constructed from an optically thick silicon wafer and a ground plane, separated by a gap into which the liquid is injected. This arrangement represents a Fabry-Perot interferometer that causes a sharp minimum in the reflection spectrum. Compared to resonance-based sensors, this sensor design can maintain its sharp spectral response when loaded with highly absorbing polar liquids. This overcomes an issue of damped resonance caused by material losses in resonance-based sensors. We report a reflection minimum shift of 8 GHz per percent ethanol in water. The sensor can be readily integrated with a microfluidic channel for real-time fluid monitoring. Published by AIP Publishing.

引用

页数：5

共 39 条

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