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Bidimensional near-field sampling spectrometry.

Mikael Renault1, Yassine Hadjar, Sylvain Blaize

  • 1Laboratoire de Nanotechnologie et d’instrumentation optique, Institut Charles Delaunay, Université de Technologie de Troyes, BP2060, Troyes, 10010, France.

Optics Letters
|October 5, 2010
PubMed
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We developed a compact Fourier-transform spectrometer using 2D spatial sampling of light interference. This novel optical sensor achieves high spectral resolution across a wide visible bandwidth, enabling detailed light spectrum analysis.

Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Nanotechnology

Background:

  • Traditional Fourier-transform spectrometers can be bulky.
  • Miniaturization is crucial for portable spectroscopic applications.
  • Developing compact devices with high spectral resolution remains a challenge.

Purpose of the Study:

  • To introduce a novel concept for a compact optical Fourier-transform spectrometer.
  • To demonstrate the feasibility of using bidimensional (2D) spatial sampling for spectral analysis.
  • To achieve wide spectral bandwidth and high spectral resolution in a miniaturized device.

Main Methods:

  • Utilized a nanostructured glass surface for light interference under total internal reflection.
  • Employed subwavelength spatial sampling of the interferogram near field using a 2D array of optical nanoantennas.

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  • Recorded scattered light intensity with a 2D CCD camera.
  • Applied a one-dimensional Fourier transform to recover the input light spectrum.

    • Main Results:

    • Demonstrated a wide spectral bandwidth, covering the visible range down to 380 nm.
    • Achieved a spectral resolution of 1.6 nm at 780 nm.
    • Successfully recovered the input light spectrum from the sampled interferogram.

    Conclusions:

    • The proposed compact Fourier-transform spectrometer concept is viable.
    • 2D spatial sampling of confined interferograms offers an effective approach for miniaturized spectroscopy.
    • The device shows potential for various applications requiring portable, high-resolution spectral analysis.