Self-optimized single-nanowire photoluminescence thermometry  

作　　者：Zhang Liang Jinhua Wu Ying Cui Hao Sun Cun-Zheng Ning 

机构地区：[1]Department of Electronic Engineering,Tsinghua University,100084 Beijing,China [2]College of Integrated Circuits and Optoelectronic Chips,Shenzhen Technology University,518118 Shenzhen,Guangdong,China

出　　处：《Light(Science & Applications)》2023年第2期259-271,共13页光（科学与应用)（英文版）

基　　金：The authors acknowledge financial support from the National Natural Science Foundation of China(Grant Nos.91750206,61861136006,and 61975252);Beijing Innovation Center for Future Chips,Tsinghua University Initiative Scientific Research Program(No.20141081296).

摘　　要：Nanomaterials-based photoluminescence thermometry(PLT)is a new contact-free photonic approach for temperature sensing,important for applications ranging from quantum technology to biomedical imaging and diagnostics.Even though numerous new materials have been explored,great challenges and deficiencies remain that hamper many applications.In contrast to most of the existing approaches that use large ensembles of rare-earth-doped nanomaterials with large volumes and unavoidable inhomogeneity,we demonstrate the ultimate size reduction and simplicity of PLT by using only a single erbium-chloride-silicate(ECS)nanowire.Importantly,we propose and demonstrate a novel strategy that contains a self-optimization or "smart"procedure to automatically identify the best PL intensity ratio for temperature sensing.The automated procedure is used to self-optimize key sensing metrics,such as sensitivity,precision,or resolution to achieve an all-around superior PLT including several record-setting metrics including the first sensitivity exceeding 100%K^(-1)(~138%K^(-1)),the highest resolution of 0.01 K,and the largest range of sensible temperatures 4-500 K operating completely within 1500-1800 nm(an important biological window).The high-quality ECS nanowire enables the use of well-resolved Stark-sublevels to construct a series of PL intensity ratios for optimization in infrared,allowing the completely Boltzmann-based sensing at cryogenic temperature for the frst time.Our single-nanowire PLT and the proposed optimization strategy overcome many existing challenges and could fundamentally impact PL nano-thermometry and related applications such as single-cell thermometry.

关 键 词：optimization EXCEEDING SIMPLICITY 

分 类 号：O43[机械工程—光学工程]