Dual-comb optomechanical spectroscopy

Xinyi Ren, Jin Pan, Ming Yan (), Jiteng Sheng (), Cheng Yang, Qiankun Zhang, Hui Ma, Zhaoyang Wen, Kun Huang, Haibin Wu () and Heping Zeng ()
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Xinyi Ren: East China Normal University
Jin Pan: East China Normal University
Ming Yan: East China Normal University
Jiteng Sheng: East China Normal University
Cheng Yang: East China Normal University
Qiankun Zhang: East China Normal University
Hui Ma: East China Normal University
Zhaoyang Wen: East China Normal University
Kun Huang: East China Normal University
Haibin Wu: East China Normal University
Heping Zeng: East China Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Optical cavities are essential for enhancing the sensitivity of molecular absorption spectroscopy, which finds widespread high-sensitivity gas sensing applications. However, the use of high-finesse cavities confines the wavelength range of operation and prevents broader applications. Here, we take a different approach to ultrasensitive molecular spectroscopy, namely dual-comb optomechanical spectroscopy (DCOS), by integrating the high-resolution multiplexing capabilities of dual-comb spectroscopy with cavity optomechanics through photoacoustic coupling. By exciting the molecules photoacoustically with dual-frequency combs and sensing the molecular-vibration-induced ultrasound waves with a cavity-coupled mechanical resonator, we measure high-resolution broadband ( > 2 THz) overtone spectra for acetylene gas and obtain a normalized noise equivalent absorption coefficient of 1.71 × 10−11 cm−1·W·Hz−1/2 with 30 GHz simultaneous spectral bandwidth. Importantly, the optomechanical resonator allows broadband dual-comb excitation. Our approach not only enriches the practical applications of the emerging cavity optomechanics technology but also offers intriguing possibilities for multi-species trace gas detection.

Date: 2023
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DOI: 10.1038/s41467-023-40771-3

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