Thermal-demagnetization-enhanced hybrid fiber-based thermometer coupled with nitrogen-vacancy centers

• DOI: 10.1364/ome.9.004634
• Publication Date: 2019-11-12T16:37:23Z
• Authors: Shao-Chun Zhang; Shen Li; Bo Du; Yang Dong; Yu Zheng; Hao-Bin Lin; Bo-Wen Zhao; Wei Zhu; Guan-Zhong Wang; Xiang-Dong Chen; Guang-Can Guo; Fang-Wen Sun
• Keywords: Thermometer; Nitrogen-vacancy center; Atmospheric temperature range

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 permanent magnet, where the temperature sensitivity was improved by converting variation magnetic field change based on thermal-demagnetization of magnet. We have achieved both large working range (room 373 K) millikelvin (1.6 mK/sqrt(Hz)), nearly 6-fold improvement compared conventional technique. This stable compact will enable wide applications for large-area detection imaging high sensitivity.