Monday, February 23, 2015

Abstract-Terahertz range complex refractive index determinations for liquids using ATR

Adrian Dobroiu
Tohuku Univ. (Japan)
Petre C. Logofătu
National Institute for Laser, Plasma and Radiation Physics (Romania)
Proc. SPIE 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII, 925818 (February 21, 2015); doi:10.1117/12.2072174

In this paper we discuss a study and application of the optical properties of liquids in the terahertz range and a possible technique for identifying liquids. The optical properties are the reflection and transmission of the radiation at various interfaces between known media and between a known medium and the unknown medium and the complex refractive index which is to be determined from measurements of the change in radiation signal after multiple optical interactions inside a silicon prism. For this purpose we use an attenuated total reflection experimental arrangement. We show that one can identify liquids placed on the top of the prism turned upside down using this method. Terahertz waves are especially useful in this context because they allow the determination of the liquid content of containers that are difficult to open or that simply cannot be opened, such as luggage in airports. Some explosives are liquids and the identification of the liquids using terahertz waves may help detecting hidden explosives. 
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