Thermal-demagnetization-enhanced hybrid fiber-based thermometer coupled with nitrogen-vacancy centers
OPTICAL MATERIALS EXPRESS(2019)
Abstract
Nitrogen-vacancy centers in diamond are attractive as quantum sensors owing to their remarkable optical and spin properties under ambient conditions. Here we experimentally demonstrated a hybrid fiber-based thermometer coupled with nitrogen-vacancy center ensemble and a permanent magnet, where the temperature sensitivity was improved by converting the temperature variation to the magnetic field change based on the thermal-demagnetization of the permanent magnet. We have achieved both large temperature working range (room temperature to 373 K) and millikelvin sensitivity (1.6 mK/root Hz), nearly 6-fold improvement compared with conventional technique. This stable and compact hybrid thermometer will enable a wide range of applications for large-area detection and imaging with high temperature sensitivity. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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Key words
thermometer,thermal-demagnetization-enhanced,fiber-based,nitrogen-vacancy
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