Fiber-based Ratiometric Optical Thermometry with Silicon-Vacancy in Microdiamonds
Abstract
Fiber optic all-optical thermometry is a promising technology to track temperature at a micro-scale while designing efficient and reliable microelectronic devices and components. In this work, we demonstrate a novel real-time ratiometric fiber optic thermometry technique based on silicon-vacancy (SiV) diamond that shows the highest temperature resolution (22.91 KHz^(-1/2) Wcm^(-2)) and spatial resolution (~7.5 um) among all-optical fiber-based thermosensors reported to date. Instead of analyzing the spectral features of temperature-dependent SiV signal, coming from SiV micro-diamond fixed on the fiber tip, an alternative parallel detection method based on filtering optics and photon counters is proposed to read out the sample temperature in real-time. The signal collection efficiency of the fiber is also investigated numerically with semi-analytic ray-optical analysis and then compared with our experimental study. We finally demonstrate the performance of the thermosensor by monitoring the temperature at distinct locations in a lab-built graphite-based microheater device. Our work introduces a reconfigurable method for temperature monitoring in microelectronic, microfluidic devices, or biological environments and unlocks a new direction for fiber-based all-optical thermometry research.
Cite
@article{arxiv.2311.17529,
title = {Fiber-based Ratiometric Optical Thermometry with Silicon-Vacancy in Microdiamonds},
author = {Md Shakhawath Hossain and Miguel Bacaoco and Thi Ngoc Anh Mai and Guillaume Ponchon and Chaohao Chen and Lei Ding and Yongliang Chen and Evgeny Ekimov and Helen Xu and Alexander S. Solntsev and Toan Trong Tran},
journal= {arXiv preprint arXiv:2311.17529},
year = {2023}
}