• Photonics Research
  • Vol. 13, Issue 6, 1497 (2025)
Naiquan Yan1,2,†, Feng Shi3,†, Xiaomeng Xue1,†, Kenan Zhang2..., Cheng Huo1,2 and Menglu Chen1,2,4,5,*|Show fewer author(s)
Author Affiliations
  • 1School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 2Zhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization, Westlake Institute for Optoelectronics, Hangzhou 311421, China
  • 3Laboratory of Science and Technology on Integrated Logistics Support, Changsha 410073, China
  • 4State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 5National Key Laboratory on Near-Surface Detection, Beijing 100012, China
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    DOI: 10.1364/PRJ.546383 Cite this Article Set citation alerts
    Naiquan Yan, Feng Shi, Xiaomeng Xue, Kenan Zhang, Cheng Huo, Menglu Chen, "Cavity-enhanced infrared quantum dot homojunction arrays," Photonics Res. 13, 1497 (2025) Copy Citation Text show less

    Abstract

    Infrared spectroscopy has wide applications in the medical field, industry, agriculture, and other areas. Although the traditional infrared spectrometers are well developed, they face the challenge of miniaturization and cost reduction. Advances in nanomaterials and nanotechnology offer new methods for miniaturizing spectrometers. However, most research on nanomaterial-based spectrometers is limited to the visible wavelength or near infrared region. Here, we propose an infrared spectrometer based on diffraction gratings and colloidal quantum dot (CQD) homojunction photodetector arrays. Coupled with a Fabry-Perot cavity, the CQD photodetector covers the 1.4–2.5 μm spectral range, with specific detectivity 4.64×1011 Jones at 2.5 μm at room temperature. The assembled spectrometer has 256 channels, with total area 2.8mm×40mm. By optimizing the response matrix from machine learning algorithms, the CQD spectrometer shows high-resolution spectral reconstruction with a resolution of approximately 7 nm covering the short-wave infrared.
    G(xn)=λminλmaxr(λ)f(xn,λ)dλ,n=1,2,,256,

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    G=RF.

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    (G(x1),G(x2),,G(xn))=(r(λ1),r(λ2),,r(λc))(f(x1,λ1)f(x2,λ1)f(xn,λ1)f(x1,λ2)f(x2,λ2)f(xn,λ2)f(x1,λc)f(x2,λc)f(xn,λc)).

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    h(xn,λ)r(λ)=f(xn+1,λ)r(λ)f(xn,λ)r(λ).

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