Enhanced sensitivity of refractive-index-sensing optical frequency comb using frequency multiplication capability of photocarrier terahertz frequency comb for rapid measurement

被引：0
|
作者：
Higaki, Masayuki [1 ]
Miyamura, Shogo [2 ]
Taue, Shuji [3 ]
Nakajima, Yoshiaki [4 ]
Tokizane, Yu [5 ]
Hase, Eiji [5 ]
Minamikawa, Takeo [5 ,6 ]
Yasui, Takeshi [5 ]
机构：
[1] Tokushima Univ, Grad Sch Sci & Technol Innovat, 2-1 Minami Josanjima, Tokushima, Tokushima 7708506, Japan
[2] Tokushima Univ, Grad Sch Adv Technol & Sci, 2-1 Minami Josanjima, Tokushima, Tokushima 7708506, Japan
[3] Kochi Univ Technol, Sch Syst Engn, 185 Miyanokuchi, Kami, Kochi 7828502, Japan
[4] Toho Univ, Dept Phys, 2-2-1 Miyama, Funabashi, Chiba 2748510, Japan
[5] Tokushima Univ, Inst Post LED Photon PLED, 2-1 Minami Josanjima, Tokushima, Tokushima 7708506, Japan
[6] Osaka Univ, Grad Sch Engn Sci, 1-3 Machikaneyama, Toyonaka, Osaka 7708506, Japan
来源：
OPTICS EXPRESS | 2024年 / 32卷 / 27期
基金：
日本学术振兴会;
关键词：
SURFACE-PLASMON RESONANCE;
D O I：
10.1364/OE.546032
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose a refractive index (RI) sensing method that leverages the frequency multiplication capability of a photocarrier terahertz (PC-THz) comb to enhance sensitivity and speed. By incorporating a PC-THz comb as a frequency multiplier for a RI-sensing optical frequency comb (OFC), we achieve significant amplification of the RI-dependent mode spacing ( f rep ) shift. Our results show a 3100-fold increase in sensitivity, confirmed through the accurate measurement of ethanol-water solutions with varying concentrations. Additionally, we demonstrate the superiority of beat frequency measurement between PC-THz comb of f rep and a reference THz wave over the direct f rep measurements, particularly in high-speed scenarios, such as real-time gas and biosensing. The ability to perform high-resolution RI measurements on the millisecond timescale, without being constrained by RF frequency counter limitations, highlights the potential of this approach. This technique paves the way for enhanced sensitivity and speed in dynamic sensing applications using RI-sensing OFC. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码：49164 / 49175
页数：12
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