Self-powered InAs nanowire detector arrays for extended-SWIR spectrometry at room temperature

Abstract

Spectral sensing in the extended shortwave infrared (e-SWIR) is important for molecular analysis, infrared imaging, and machine vision, motivating the development of compact spectrometers for broader applications. However, conventional commercial off-the-shelf spectrometers in this wavelength region are expensive and bulky due to their reliance on external dispersive optics/filters and/or cryogenic accessories. Other emerging computational spectrometers are based on Si and InGaAs photodetectors that remain focused on the visible and near-infrared, with few detector platforms operating in the e-SWIR regime that simultaneously provide broadband sensitivity, low-noise room-temperature operation, and diverse spectral signatures for accurate identification and reconstruction. Here, we report a room-temperature e-SWIR computational spectrometer based on InAs/InP core-shell nanowire photodetector arrays with geometry-encoded spectral responses. The detectors exhibit self-powered broadband photoresponse across the 1--3 μm range, with responsivity up to 0.215 A W⁻¹, detectivity up to 1.6 × 10⁹ cm Hz^1/2 W⁻¹, and microsecond response times. The excellent detector performance is leveraged to demonstrate filter-free spectral reconstruction using a compact multipixel photodetector array device. This enables high-accuracy molecular absorption spectrum reconstruction and hyperspectral imaging. Our results indicate that InAs nanowire arrays are a promising platform for compact computational spectrometry and imaging in the e-SWIR at room temperature.

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BibTeX RIS

BibTeX

@misc{yu2026selfpowered,
  title = {{Self-powered InAs nanowire detector arrays for extended-SWIR spectrometry at room temperature}},
  author = {Yang Yu and Wei Wen Wong and Zhe Li and Dawei Liu and Jinyuan Chen and Seyed Saleh Mousavi Khaleghi and Yue Bian and Kosala Dhanawansha and Li Li and Hongwei Liu and Xiaoxue Xu and Monica S. Allen and Jeffery W. Allen and Hark Hoe Tan and Chennupati Jagadish and Kenneth Crozier and Ziyuan Li and Chaohao Chen and Lan Fu},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.06952},
  eprint = {2609.06952},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.06952},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Self-powered InAs nanowire detector arrays for extended-SWIR spectrometry at room temperature
AU  - Yang Yu
AU  - Wei Wen Wong
AU  - Zhe Li
AU  - Dawei Liu
AU  - Jinyuan Chen
AU  - Seyed Saleh Mousavi Khaleghi
AU  - Yue Bian
AU  - Kosala Dhanawansha
AU  - Li Li
AU  - Hongwei Liu
AU  - Xiaoxue Xu
AU  - Monica S. Allen
AU  - Jeffery W. Allen
AU  - Hark Hoe Tan
AU  - Chennupati Jagadish
AU  - Kenneth Crozier
AU  - Ziyuan Li
AU  - Chaohao Chen
AU  - Lan Fu
PY  - 2026
DA  - 2026/09/10
PB  - arXiv
DO  - 10.48550/arxiv.2609.06952
UR  - https://arxiv.org/abs/2609.06952
AB  - Spectral sensing in the extended shortwave infrared (e-SWIR) is important for molecular analysis, infrared imaging, and machine vision, motivating the development of compact spectrometers for broader applications. However, conventional commercial off-the-shelf spectrometers in this wavelength region are expensive and bulky due to their reliance on external dispersive optics/filters and/or cryogenic accessories. Other emerging computational spectrometers are based on Si and InGaAs photodetectors that remain focused on the visible and near-infrared, with few detector platforms operating in the e-SWIR regime that simultaneously provide broadband sensitivity, low-noise room-temperature operation, and diverse spectral signatures for accurate identification and reconstruction. Here, we report a room-temperature e-SWIR computational spectrometer based on InAs/InP core-shell nanowire photodetector arrays with geometry-encoded spectral responses. The detectors exhibit self-powered broadband photoresponse across the 1--3 μm range, with responsivity up to 0.215 A W^−1, detectivity up to 1.6 × 10^9 cm Hz^1/2 W^−1, and microsecond response times. The excellent detector performance is leveraged to demonstrate filter-free spectral reconstruction using a compact multipixel photodetector array device. This enables high-accuracy molecular absorption spectrum reconstruction and hyperspectral imaging. Our results indicate that InAs nanowire arrays are a promising platform for compact computational spectrometry and imaging in the e-SWIR at room temperature.
ER  -

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