講演情報
[10p-N203-3]Terahertz Time-Domain Ellipsometry of Liquids Without a Liquid Cell
〇Atsuki Kamio1, Verdad C. Agulto1, Zixi Zhou1, Kosaku Kato1, Thanh Nhat Khoa Phan1, Toshiyuki Iwamoto1,2, Makoto Nakajima1 (1.ILE, Univ. of Osaka, 2.Nippo Precision Co., Ltd)
キーワード：
terahertz wave、ellipsometry、liquid
This research demonstrates a high-precision method for evaluating volatile liquids using Terahertz Time-Domain Ellipsometry (THz-TDE) without a liquid cell.
Conventional transmission THz-TDS requires extremely thin cells for highly absorbing liquids, which can cause measurement errors. This study applies THz-TDE by directly irradiating the liquid surface. However, experiments revealed that evaporation of the water sample caused its surface level to decrease, leading to delays and amplitude reductions in the reflected THz wave and introducing errors.
To solve this, a new frequency-domain analysis method was developed to correct for the effects of the changing surface level. The absorption coefficient of water, calculated using this correction, showed good agreement with previously reported data, confirming the method's validity. This approach successfully evaluated the optical constants of water up to 3 THz, a range difficult to measure with conventional methods due to strong absorption. This study highlights the potential of THz-TDE with this new analysis as a robust technique for accurately characterizing volatile liquids without a cell.
Conventional transmission THz-TDS requires extremely thin cells for highly absorbing liquids, which can cause measurement errors. This study applies THz-TDE by directly irradiating the liquid surface. However, experiments revealed that evaporation of the water sample caused its surface level to decrease, leading to delays and amplitude reductions in the reflected THz wave and introducing errors.
To solve this, a new frequency-domain analysis method was developed to correct for the effects of the changing surface level. The absorption coefficient of water, calculated using this correction, showed good agreement with previously reported data, confirming the method's validity. This approach successfully evaluated the optical constants of water up to 3 THz, a range difficult to measure with conventional methods due to strong absorption. This study highlights the potential of THz-TDE with this new analysis as a robust technique for accurately characterizing volatile liquids without a cell.