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A Microlens Array Grating for Miniature Multi-Channel Spectrometers.

Shuonan Shan1, Jingwen Li1,2, Peiyuan Liu1

  • 1Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

Sensors (Basel, Switzerland)
|October 28, 2023
PubMed
Summary
This summary is machine-generated.

A novel microlens array grating (MLAG) enables miniaturized multi-channel spectrometers. This compact design integrates focusing and dispersion, achieving high performance for advanced spectral analysis.

Keywords:
PDMSfabricationgratingmicrolens arrayminiature multi-channel spectrometersoft lithography

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Micro-optics

Background:

  • Existing multi-channel spectrometers are bulky due to stacked single-channel units.
  • Miniaturization is critical for broader spectrometer applications.
  • Current designs face limitations in channel count and portability.

Purpose of the Study:

  • To design and fabricate a compact microlens array grating (MLAG) for miniature multi-channel spectrometers.
  • To integrate focusing and dispersion functionalities into a single transmissive element.
  • To demonstrate the feasibility of MLAG for high-performance, miniaturized spectral analysis.

Main Methods:

  • Designed a transmissive microlens array grating (MLAG) integrating microlens arrays and gratings.
  • Fabricated the MLAG using soft lithography with high precision (<2.2% deviation).
  • Developed a miniature multi-channel spectrometer utilizing the fabricated MLAG.

Main Results:

  • The MLAG measures 10 mm × 10 mm × 4 mm, offering over 2000 units.
  • The spectrometer operates in the 400-700 nm range with 6 nm resolution.
  • Experimental verification confirmed independently valid cells with ~0.5 nm wavelength repeatability.

Conclusions:

  • The developed MLAG is a viable solution for creating compact, high-performance multi-channel spectrometers.
  • The integrated design significantly reduces size and weight compared to traditional spectrometers.
  • The MLAG enables precise spectral measurements with excellent repeatability for advanced applications.