Broadband Surface-Enhanced Mid-Infrared Laser Spectroscopy With Adaptive Spectrum Compensation

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Photonics Technology Letters Pub Date : 2025-02-05 DOI:10.1109/LPT.2025.3539291

Jing Ni;Zhouzhuo Tang;Zihao Liu;Qijie Wang;Xia Yu

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引用次数: 0

Abstract

External cavity-quantum cascade lasers (EC-QCLs) offer high spectral power density (SPD) over several hundred wavenumbers, making them ideal for broadband mid-infrared absorption spectroscopy. Surface-enhanced infrared absorption spectroscopy (SEIRA) leverages nanoantenna structure to enhance the signal in an infrared absorption spectrum. However, the highly uneven SPD of the EC-QCL and strong absorption of the SEIRA nanoantennas challenge the limited dynamic range of the detection system and thus introduce higher noise levels. Here, an adaptive spectrum compensation (ASC) method is proposed and applied in our home-built broadband surface-enhanced mid-infrared laser absorption spectrometer. The ASC method adaptively optimizes the laser beam and adjusts the SPD of the spectra reaching the detector with minimal loss. This reduces the dynamic range noise, detector noise and shot noise of the detection system, and allows quick adaptive switching between different background spectra. For our spectrometer, the ASC method has reduced the noise level of the absorption spectrum across 1660-975 cm−1 by more than 3 times. The proposed simple and low-cost spectrum compensation method could be applied to other tunable laser absorption spectroscopies with highly uneven SPD.

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.