基于钙钛矿纳米片激光器的高灵敏度亚微米级温度传感器

Submicron scale temperature sensors are crucial for a range of applications，particularly in micro and nanoscale environments. One promising solution involves the use of active whispering gallery mode（WGM）microresonators. These resonators can be remotely excited and read out using free-space structures，simplifying the process of sensing. In this study，we present a submicron-scale temperature sensor with a remarkable sensitivity up to 185 pm/℃ based on a triangular MAPbI₃ nanoplatelet（NPL）laser. Notably，as temperature changes，the peak wavelength of the laser line shifts linearly. This unique characteristic allows for precise temperature sensing by tracking the peak wavelength of the NPL laser. The optical modes are confined within the perovskite NPL，which measures just 85 nm in height，due to total internal reflection. Our NPL laser boasts several key features，including a high Q of ~ 2 610 and a low laser threshold of about 19. 8 μJ·cm⁻². The combination of exceptional sensitivity and ultra-small size makes our WGM device an ideal candidate for integration into systems that demand compact temperature sensors. This advancement paves the way for significant progress in the development of ultrasmall temperature sensors，opening new possibilities across various fields.