| Issue |
EPJ Web Conf.
Volume 335, 2025
EOS Annual Meeting (EOSAM 2025)
|
|
|---|---|---|
| Article Number | 03021 | |
| Number of page(s) | 2 | |
| Section | Topical Meeting - Applications of Optics and Photonics | |
| DOI | https://doi.org/10.1051/epjconf/202533503021 | |
| Published online | 22 September 2025 | |
https://doi.org/10.1051/epjconf/202533503021
High-Sensitivity and High-Precision RI Sensing Using THz-Comb-Based Frequency Multiplication and Dual-Comb Active-Dummy Temperature Compensation
1 Institute of Post-LED Photonics (pLED), Tokushima University, 2-1, Minami-Josanjima, Tokushima, Tokushima 770-8506, Japan
2 School of System Engineering, Kochi University of Technology, 185, Miyanokuchi, Tosayamada, Kami, Kochi 782-8502, Japan
3 Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka 770-8506, Japan
* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published online: 22 September 2025
Abstract
This paper presents a novel optical-comb-based refractive index sensor that simultaneously achieves high-sensitivity and high-precision by combining THz-comb-based frequency multiplication with active-dummy temperature compensation in a dual-comb configuration. In this approach, a little RI-induced shift of the comb mode spacing ( frep) is frequency-multiplied via THz frequency comb, while the dual-comb scheme compensates for temperature drift in frep. Experimental results demonstrate a 3100-fold improvement in RI sensitivity and a 10-fold enhancement in measurement precision.
© The Authors, published by EDP Sciences, 2025
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