Sensing at terahertz frequency domain using a sapphire whispering gallery mode resonator

被引：14
|
作者：
Mathai, C. [1 ]
Jain, Ravikumar [2 ]
Achanta, V. G. [2 ]
Duttagupta, S. P. [1 ]
Ghindani, D. [2 ]
Josh, N. R. [3 ]
Pinto, R. [4 ]
Prabhu, S. S. [2 ]
机构：
[1] Indian Inst Technol, Bombay 400076, Maharashtra, India
[2] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[3] Sahyadri Coll Engn & Management, Mangalore 575007, India
[4] Alvas Inst Engn & Technol, Shobhavana Campus, Mijar 574225, Moodbidri, India
来源：
OPTICS LETTERS | 2018年 / 43卷 / 21期
关键词：
D O I：
10.1364/OL.43.005383
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this Letter, we experimentally demonstrate a terahertz (THz) whispering gallery mode (WGM) sensor based on a sapphire WGM resonator. The fundamental mode at 129.49 GHz with a Q-factor of 4.63 x 10(3) is used to study its sensitivity to adsorbed molecules. The efficiency of our sensor to detect rhodamine 6G dye molecules in a polyvinyl alcohol matrix at room temperature has been manifested, and a detection sensitivity of 25 parts per million has been achieved. Also, we report an analytical approach based on coupled-mode theory between the waveguide mode and the spherical resonator mode to evaluate the absorption coefficient of the adsorbed molecule on the resonator. The model is modified to evaluate optical constants of materials. The results obtained have been verified by continuous-wave THz transmission results. The results are of importance in sensing, metrology, and material characterization. (C) 2018 Optical Society of America
引用
收藏
页码：5383 / 5386
页数：4
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