Open AccessFrequency modulation based continuous-wave terahertz homodyne system
Author(s) -
Il-Min Lee,
Namje Kim,
Eui Su Lee,
Shihui Han,
Kiwon Moon,
Kyung Hyun Park
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.000846
Subject(s) - terahertz radiation , optics , homodyne detection , direct conversion receiver , continuous wave , terahertz spectroscopy and technology , modulation (music) , photomixing , frequency modulation , refractive index , materials science , laser , physics , optoelectronics , terahertz metamaterials , far infrared laser , computer science , telecommunications , bandwidth (computing) , acoustics
In this study, inspired by the frequency-modulated continuous-wave (FMCW) method, an operation scheme of continuous-wave (CW) terahertz (THz) homodyne system is proposed and evaluated. For this purpose, we utilized the fast and stable wavelength tuning characteristics of a dual-mode laser (DML) as a beating source. Using the frequency-modulated THz waves generated by DML, a cost-effective and robust operation of CW THz system to be applicable to the measurements of thickness or refractive index of a sample is demonstrated. We believe that the proposed scheme shows a potential to the implementations of compact and fast CW THz measurement systems that can be useful in many THz applications.