Optical whispering-gallery-mode microcavities have attracted significant attention for their potential in ultrasensitive ultrasound sensing,despite always relying on expensive tunable lasers in applications.In this st...Optical whispering-gallery-mode microcavities have attracted significant attention for their potential in ultrasensitive ultrasound sensing,despite always relying on expensive tunable lasers in applications.In this study,we integrated an electrothermal tuning function inside the microcavity,enabling fast scanning of modes by applying voltages,which helps provide real-time searching and tracking of the optimal mode.Our device demonstrated a quality factor exceeding 10^(6)with a broad tuning range over 33 GHz.This structure achieved high sensitivity in ultrasound detection,with a noise equivalent pressure(NEP)of 3.35 m Pa/Hz^(1/2)at 20 MHz.We further reported the advantages of the mode thermal broadening effect for ultrasound detection,with successfully obtaining high-contrast photoacoustic images.Our research introduces an innovative approach for cost-effective,high-stability ultrasound detection with microcavity,showing great value for application in photoacoustic imaging.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.62305006,and 61701261)the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20230287,BK20230286,and BK20160417)Nantong Social Livelihood Science and Technology Planning Project(Grant Nos.MS12022003,and MS2023071)。
文摘Optical whispering-gallery-mode microcavities have attracted significant attention for their potential in ultrasensitive ultrasound sensing,despite always relying on expensive tunable lasers in applications.In this study,we integrated an electrothermal tuning function inside the microcavity,enabling fast scanning of modes by applying voltages,which helps provide real-time searching and tracking of the optimal mode.Our device demonstrated a quality factor exceeding 10^(6)with a broad tuning range over 33 GHz.This structure achieved high sensitivity in ultrasound detection,with a noise equivalent pressure(NEP)of 3.35 m Pa/Hz^(1/2)at 20 MHz.We further reported the advantages of the mode thermal broadening effect for ultrasound detection,with successfully obtaining high-contrast photoacoustic images.Our research introduces an innovative approach for cost-effective,high-stability ultrasound detection with microcavity,showing great value for application in photoacoustic imaging.
