On-chip near-infrared spectroscopy of CO2 using high resolution plasmonic filter array

Chong, Xinyuan; Li, Erwen; Squire, Kenneth; Wang, Alan X.

doi:10.1063/1.4953261

Cited by 27 publications

(8 citation statements)

References 37 publications

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“…The most important example is the color camera that relies three spectral filters: Red(R), Green(G), Blue(B). To go beyond three spectral bands, Fabry-Perot 13 and plasmonic filters 12,27,29 have been developed. However, these resonant filters have simple Lorentz line shapes and lack the spectral diversity to provide high spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

Single-shot on-chip spectral sensors based on photonic crystal slabs

et al. 2019

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Miniaturized spectrometers have significant potential for portable applications such as consumer electronics, health care, and manufacturing. These applications demand low cost and high spectral resolution, and are best enabled by single-shot free-space-coupled spectrometers that also have sufficient spatial resolution. Here, we demonstrate an on-chip spectrometer that can satisfy all of these requirements. Our device uses arrays of photodetectors, each of which has a unique responsivity with rich spectral features. These responsivities are created by complex optical interference in photonic-crystal slabs positioned immediately on top of the photodetector pixels. The spectrometer is completely complementary metal–oxide–semiconductor (CMOS) compatible and can be mass produced at low cost.

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Section: Introductionmentioning

confidence: 99%

Single-shot on-chip spectral sensors based on photonic crystal slabs

et al. 2019

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“…Hole array periodicity is varied to tune the SP resonance wavelength causing spectral shifts in the corresponding spectral curves. Recently, plasmonic lters composed of periodic microhole arrays in noble metals like gold (Au), and silver (Ag) are demonstrated by exploiting SSP resonance [21][22][23]. Jang et al further demonstrated spectral imaging with a square array of micron-sized holes in Au lm on gallium arsenide dielectric as an SSP structure [24].…”

Section: Introductionmentioning

confidence: 99%

Longwave infrared multispectral image sensor system using aluminum-germanium plasmonic filter arrays

Karishma

Widdicombe

Sun

et al. 2023

Preprint

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A multispectral camera records image data in various wavelengths across the electromagnetic spectrum to acquire additional information that a conventional camera fails to capture. With the advent of high-resolution image sensors and colour filter technologies, multispectral imagers in the visible wavelengths have become popular with increasing commercial viability in the last decade. However, multispectral imaging in longwave infrared (LWIR; 8 – 14 µm) is still an emerging area due to the limited availability of optical materials, filter technologies, and high-resolution sensors. Images from LWIR multispectral cameras can capture emission spectra of objects to extract additional information that a human eye fails to capture and thus have important applications in precision agriculture, forestry, medicine, and object identification. In this work, we experimentally demonstrate an LWIR multispectral image sensor with three wavelength bands using optical elements made of an aluminum-based plasmonic filter array sandwiched in germanium. To realize the multispectral sensor, the filter arrays are then integrated into a 3D printed wheel stacked on a low-resolution monochrome thermal sensor. Our prototype device is calibrated using a blackbody and its thermal output has been enhanced with computer vision methods. By applying a state-of-the-art deep learning method, we have also reconstructed multispectral images to a better spatial resolution. Scientifically, our work demonstrates a versatile spectral thermography technique for detecting target signatures in the LWIR range and other advanced spectral analyses.

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“…We note that our approach is not limited to this wavelength range, however. As our plasmonic filters are fabricated by lithography, evaporation, and lift-off, their operating wavelength can be readily shifted from the visible to the mid-IR [24,[37][38][39][40][41][42][43][44][45][46] by adjusting the geometric parameters and, if nec-essary, the substrate material. Unlike previous works on molecular and gas sensing using infrared metasurfaces, [47][48][49][50] the working principle of our device does not rely on the analyte molecules being in the near-field of the metasurfaces, e.g.…”

Section: Introductionmentioning

confidence: 99%

Compact Chemical Identifier Based on Plasmonic Metasurface Integrated with Microbolometer Array

Meng

Weston

Balendhran

et al. 2022

Laser & Photonics Reviews

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The identification of chemicals from their mid-infrared spectra has applications that include industrial production of chemicals, food production, pharmaceutical manufacturing, and environmental monitoring. This is generally done using laboratory benchtop tools, such as the Fourier transform infrared spectrometer. Although such systems offer high performance, alternative platforms offering reduced size, weight, and cost can enable a host of new applications, e.g. in consumer personal electronics. Here a compact microspectrometer platform for chemical identification, comprising a mid-infrared metasurface integrated with a lightweight (≈1 g) and very small (≈1 cm 3 ) microbolometer-based thermal camera is experimentally demonstrated. A machine learning algorithm is trained to analyze the microspectrometer output and classify chemicals based on their mid-infrared fingerprints. High accuracy identification of four liquid chemicals, concentration quantification of ethyl lactate in cyclohexane down to subpercentage levels, and the classification of food and drug samples is demonstrated.

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On-chip near-infrared spectroscopy of CO2 using high resolution plasmonic filter array

Cited by 27 publications

References 37 publications

Single-shot on-chip spectral sensors based on photonic crystal slabs

Single-shot on-chip spectral sensors based on photonic crystal slabs

Longwave infrared multispectral image sensor system using aluminum-germanium plasmonic filter arrays

Compact Chemical Identifier Based on Plasmonic Metasurface Integrated with Microbolometer Array

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