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arXiv · 2311.17529

Fiber-based Ratiometric Optical Thermometry with Silicon-Vacancy in Microdiamonds

Md Shakhawath Hossain·Miguel Bacaoco·Thi Ngoc Anh Mai·Guillaume Ponchon·Chaohao Chen·Lei Ding·Yongliang Chen·Evgeny Ekimov·Helen Xu·Alexander S. Solntsev·Toan Trong Tran
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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.

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Md Shakhawath Hossain, Miguel Bacaoco, Thi Ngoc Anh Mai, Guillaume Ponchon, Chaohao Chen, Lei Ding, Yongliang Chen, Evgeny Ekimov, Helen Xu, Alexander S. Solntsev, Toan Trong Tran. 2023-11-29. Fiber-based Ratiometric Optical Thermometry with Silicon-Vacancy in Microdiamonds. https://arxiv.org/abs/2311.17529

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