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Design and implementation of a sub-nm resolution microspectrometer based on a Linear-Variable Optical Filter.

Arvin Emadi1, Huaiwen Wu, Ger de Graaf

  • 1Faculty EEMCS, Department ME/EI, Delft University of Technology, Mekelweg 4, 2628 CD, Delft, The Netherlands. a.emadi@tudelft.nl

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This study presents a microspectrometer using a Linear Variable Optical Filter (LVOF) for visible light. Narrowband LVOF designs offer superior spectral resolution, proving beneficial for specific applications.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Instrumentation Engineering

Background:

  • Microspectrometers are crucial for spectral analysis across various scientific fields.
  • Linear Variable Optical Filters (LVOFs) offer a compact and potentially cost-effective solution for spectral filtering.
  • Developing high-resolution, miniaturized spectrometers remains an active area of research.

Purpose of the Study:

  • To introduce and evaluate a microspectrometer concept based on a Linear Variable Optical Filter (LVOF).
  • To explore LVOF performance in both narrow and wide spectral bands within the visible spectrum.
  • To assess the spectral resolution and identify limitations of the LVOF microspectrometer design.

Main Methods:

  • Design and fabrication of LVOFs for two distinct spectral bands (610-680 nm and 570-740 nm).
  • Implementation of an iterative signal processing algorithm with initial calibration to improve spectral resolution.
  • Experimental validation using a Neon lamp spectrum and analysis of measurement results.

Main Results:

  • LVOF microspectrometers were fabricated for narrowband and wideband visible spectrum applications.
  • An iterative signal processing algorithm enhanced spectral resolution.
  • The narrowband design achieved a spectral resolution of 0.7 nm, while the wideband design achieved 2.2 nm.

Conclusions:

  • LVOF-based microspectrometers are particularly advantageous for narrowband spectral applications.
  • The developed microspectrometer concept demonstrates potential for high-resolution spectral measurements.
  • Understanding operating limits and error sources is key for optimizing LVOF microspectrometer performance.