Cantilever-enhanced dual-comb photoacoustic spectroscopy

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL Photoacoustics Pub Date : 2024-03-21 DOI:10.1016/j.pacs.2024.100605

Jiapeng Wang , Hongpeng Wu , Xiaoli Liu , Gang Wang , Yong Wang , Chaofan Feng , Ruyue Cui , Zhenfeng Gong , Lei Dong

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Abstract

Dual-comb photoacoustic spectroscopy (DC-PAS) advances spectral measurements by offering high-sensitivity and compact size in a wavelength-independent manner. Here, we present a novel cantilever-enhanced DC-PAS scheme, employing a high-sensitivity fiber-optic acoustic sensor based on an optical cantilever and a non-resonant photoacoustic cell (PAC) featuring a flat-response characteristic. The dual comb is down-converted to the audio frequency range, and the resulting multiheterodyne sound waves from the photoacoustic effect, are mapped into the response frequency region of the optical cantilever microphone. This cantilever-enhanced DC-PAS method provides advantages such as high sensitivity, compact design, and immunity to electromagnetic interference. Through 10 seconds averaging time, the proposed approach experimentally achieved a minimum detection limit of 860 ppb for acetylene. This technology presents outstanding opportunities for highly sensitive detection of trace gases in a wavelength-independent manner, all within a compact volume.

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悬臂增强双梳状光声光谱仪

双梳光声光谱法（DC-PAS）通过提供与波长无关的高灵敏度和紧凑尺寸，推动了光谱测量的发展。在此，我们提出了一种新型悬臂增强 DC-PAS 方案，该方案采用了基于光学悬臂的高灵敏度光纤声学传感器和具有平响应特性的非共振光声电池 (PAC)。双梳频被向下转换到音频范围，由此产生的光声效应多谐声波被映射到光学悬臂麦克风的响应频率区域。这种悬臂增强型 DC-PAS 方法具有灵敏度高、设计紧凑、抗电磁干扰等优点。通过 10 秒钟的平均时间，所提出的方法在实验中达到了 860 ppb 的乙炔最低检测限。这项技术为在紧凑的体积内以不受波长影响的方式高灵敏地检测痕量气体提供了绝佳的机会。

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来源期刊

Photoacoustics Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

11.40

自引率

16.50%

发文量

审稿时长

53 days

期刊介绍： The open access Photoacoustics journal (PACS) aims to publish original research and review contributions in the field of photoacoustics-optoacoustics-thermoacoustics. This field utilizes acoustical and ultrasonic phenomena excited by electromagnetic radiation for the detection, visualization, and characterization of various materials and biological tissues, including living organisms. Recent advancements in laser technologies, ultrasound detection approaches, inverse theory, and fast reconstruction algorithms have greatly supported the rapid progress in this field. The unique contrast provided by molecular absorption in photoacoustic-optoacoustic-thermoacoustic methods has allowed for addressing unmet biological and medical needs such as pre-clinical research, clinical imaging of vasculature, tissue and disease physiology, drug efficacy, surgery guidance, and therapy monitoring. Applications of this field encompass a wide range of medical imaging and sensing applications, including cancer, vascular diseases, brain neurophysiology, ophthalmology, and diabetes. Moreover, photoacoustics-optoacoustics-thermoacoustics is a multidisciplinary field, with contributions from chemistry and nanotechnology, where novel materials such as biodegradable nanoparticles, organic dyes, targeted agents, theranostic probes, and genetically expressed markers are being actively developed. These advanced materials have significantly improved the signal-to-noise ratio and tissue contrast in photoacoustic methods.