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Mass production-enabled computational spectrometers based on multilayer thin films.

Cheolsun Kim1, Pavel Ni1, Kang Ryeol Lee2

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Summary
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New multilayer thin film (MTF) filter arrays enable compact computational spectrometers. These devices achieve high-resolution spectral recovery and imaging, offering a wide working range for diverse applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Traditional spectrometers are often bulky and expensive.
  • Computational spectroscopy offers a path towards miniaturized spectral sensing.

Purpose of the Study:

  • To develop and demonstrate a novel multilayer thin film (MTF) filter array for computational spectroscopy.
  • To evaluate the performance of the MTF filter array in spectral recovery and imaging.

Main Methods:

  • Fabrication of MTF filter arrays using stencil lithography on a CMOS image sensor.
  • Acquisition of 36 unique light intensities with a single exposure.
  • Numerical optimization techniques for spectrum reconstruction.
  • Demonstration of computational pinhole spectral imaging.

Main Results:

  • Successful recovery of light spectra in the 500-849 nm range with 1 nm spacing.
  • Reconstructed spectra closely matched reference measurements from a grating spectrometer.
  • Reconstruction of 350 monochromatic images with 1 nm spectral spacing.

Conclusions:

  • MTF filter arrays integrated with CMOS sensors form effective computational spectrometers.
  • The developed system offers compact size, high resolution, and a wide working range.
  • Potential applications in various fields requiring advanced spectral analysis.