Ultrasensitive detection of local acoustic vibrations at room temperature by plasmon-enhanced single-molecule fluorescence

Mingcai Xie, Hanyu Liu, Sushu Wan, Xuxing Lu, Daocheng Hong, Yu Du, Weiqing Yang, Zhihong Wei, Susu Fang, Chen-Lei Tao, Dan Xu, Boyang Wang, Siyu Lu, Xue-Jun Wu, Weigao Xu, Michel Orrit () and Yuxi Tian ()
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Mingcai Xie: Nanjing University
Hanyu Liu: Nanjing University
Sushu Wan: Nanjing University
Xuxing Lu: Nanjing University
Daocheng Hong: Nanjing University
Yu Du: Nanjing University
Weiqing Yang: Nanjing University
Zhihong Wei: Nanjing University
Susu Fang: Nanjing University
Chen-Lei Tao: Nanjing University
Dan Xu: Nanjing University
Boyang Wang: Zhengzhou University
Siyu Lu: Zhengzhou University
Xue-Jun Wu: Nanjing University
Weigao Xu: Nanjing University
Michel Orrit: Leiden University
Yuxi Tian: Nanjing University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Sensitive detection of local acoustic vibrations at the nanometer scale has promising potential applications involving miniaturized devices in many areas, such as geological exploration, military reconnaissance, and ultrasound imaging. However, sensitive detection of weak acoustic signals with high spatial resolution at room temperature has become a major challenge. Here, we report a nanometer-scale system for acoustic detection with a single molecule as a probe based on minute variations of its distance to the surface of a plasmonic gold nanorod. This system can extract the frequency and amplitude of acoustic vibrations with experimental and theoretical sensitivities of 10 pm Hz−1/2 and 10 fm Hz−1/2, respectively. This approach provides a strategy for the optical detection of acoustic waves based on molecular spectroscopy without electromagnetic interference. Moreover, such a small nano-acoustic detector with 40-nm size can be employed to monitor acoustic vibrations or read out the quantum states of nanomechanical devices.

Date: 2022
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DOI: 10.1038/s41467-022-30955-8

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