Development of a Compact and Robust Mid-Infrared Spectrometer by Using a Silicon/Air Hyperspectral Filter

Jeon, Taeyoon; Nateghi, Amirhossein; Jones, William M.; Choi, Changsoon; Cárdenas, Juan Pablo; Ross, Charles C.; Scherer, Axel

doi:10.1021/acsphotonics.1c01750

Cited by 13 publications

(3 citation statements)

References 22 publications

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“…The mid‐infrared optical filter with gradual change of cavity thickness can be a good solution for the light dispersion elements of miniaturized mid‐IR spectrometers. [ 22 ] In our previous work, silicon/air mirrors, utilizing free‐standing silicon films, were used to create continuously variable optical filters in the mid‐IR range. However, this approach encountered a challenge: the bowing of the silicon film.…”

Section: Introductionmentioning

confidence: 99%

Compact Mid‐Infrared Spectrometer Using Continuously Variable Infrared Filter and Microbolometer Array for Simple and Fast Measurement of Molecular Mid‐IR Spectra

Jeon,

Nateghi,

Choi

et al. 2024

Advanced Optical Materials

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The mid‐infrared (mid‐IR) region is attractive for spectroscopy because this range has molecular fingerprint information. Existing FTIR‐based systems are limited by their complex optical systems, highlighting the ongoing necessity to advance miniaturization and simplify these systems. Here, a compact mid‐IR spectroscopy is introduced in the mid‐IR range, utilizing a continuously variable mid‐IR filter. This filter is made from Germanium (Ge) and BaF2 and is produced using physical vapor deposition. Continuously varying wavelengths of mid‐IR light are transmitted from different areas of the filter. These different wavelengths of light enter each pixel of the microbolometer array. Calibration is conducted using a sample material to match each pixel of the microbolometer array to its corresponding wavelength. Additionally, a deconvolution algorithm is applied to sharpen the acquired spectrum. This results in acquisition of high signal‐to‐noise ratio mid‐IR spectra in the LWIR region. Using this technology, mid‐IR spectroscopy for several types of samples like polymer film, and gas molecules is possible. In addition, by adopting total internal reflection, it is possible to measure non‐uniform thickness samples, such as liquid droplets.

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Section: Introductionmentioning

confidence: 99%

Compact Mid‐Infrared Spectrometer Using Continuously Variable Infrared Filter and Microbolometer Array for Simple and Fast Measurement of Molecular Mid‐IR Spectra

Jeon,

Nateghi,

Choi

et al. 2024

Advanced Optical Materials

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“…Even a small perturbation in initial conditions will induce a huge impact on the reconstructed results. Thus, much attention is focused on improving the signal-to-noise ratio, while the spectral resolution is always been ignored 31,35,36 . To improve the spectral resolution, many state-of-the-art techniques have employed tunable narrowband filters 37,38,39,40 .…”

Section: Introductionmentioning

confidence: 99%

Planar photonic chips with tailored dispersion relations for high-efficient spectrographic devices

Chen¹,

Fan

Sun

et al. 2023

Preprint

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Spectral characterizations play the important roles in both scientific research and industry. Now, there is a growing demand for spectrometers that have the merits of miniaturized size, high-efficiency, and high spectral resolution. Here, a planar photonic chip containing a photonic band gap (PBG) with tailored dispersion relations is proposed to work as a high-efficient compact spectrographic device, taking advantages of its loading Bloch surface waves (BSWs). When this chip was attached to a prism, the angular dispersion power of the low-loss BSWs enhances the spectra resolving ability of this prism without any need for inversion algorithms or physical slits, thus resulting in high efficiency in utilizing the optical signals and retrieving the spectra. The spectra of various source, such as laser, white light, fluorescence emission, and even the Raman scattering light are characterized with the compact high-efficient spectrographic devices. The achieved spectral resolution can be as high as 0.6 nm.

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“…In this mid-IR region, various optical devices such as Fourier transform infrared spectroscopy (FTIR) [ 2 ] and quantum cascade laser (QCL) [ 3 ] are used for molecular detection. In addition, there have been studies to miniaturize molecular sensors in the mid-infrared region using resonators such as the Fabry–Perot filter [ 4 ], frequency comb [ 5 , 6 ], and metasurface [ 7 , 8 ]. One of the major limitations in designing mid-IR optical systems is that there are few low-refractive-index materials with low absorption in the mid-IR region.…”

Section: Introductionmentioning

confidence: 99%

Novel Deposition Method of Crosslinked Polyethylene Thin Film for Low-Refractive-Index Mid-Infrared Optical Coatings

Jeon,

Myung,

Choi

et al. 2023

Sensors

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Mid-infrared optics require optical coatings composed of high- and low-refractive-index dielectric layers for the design of optical mirrors, filters, and anti-reflection coatings. However, there are not many technologies for depositing a material with a refractive index of less than 2 and a low loss in the mid-infrared region. Here, we present a unique deposition method of crosslinked polyethylene thin film for mid-IR optical filter design. Polyethylene has a refractive index of 1.52 in the mid-infrared region and a small number of absorption peaks, so it is useful for making optical filters in the mid-infrared region. Only 1 keV of energy is required to crosslink the entire film by irradiating an electron beam while depositing polyethylene. In addition, crosslinked polyethylene thin film has high mechanical strength, so there is no cracking or peeling when used with germanium. This allows for the use of crosslinked polyethylene as a low refractive index for mid-infrared optical coating.

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Development of a Compact and Robust Mid-Infrared Spectrometer by Using a Silicon/Air Hyperspectral Filter

Cited by 13 publications

References 22 publications

Compact Mid‐Infrared Spectrometer Using Continuously Variable Infrared Filter and Microbolometer Array for Simple and Fast Measurement of Molecular Mid‐IR Spectra

Compact Mid‐Infrared Spectrometer Using Continuously Variable Infrared Filter and Microbolometer Array for Simple and Fast Measurement of Molecular Mid‐IR Spectra

Planar photonic chips with tailored dispersion relations for high-efficient spectrographic devices

Novel Deposition Method of Crosslinked Polyethylene Thin Film for Low-Refractive-Index Mid-Infrared Optical Coatings

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