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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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High-resolution optical spectroscopy using multimode interference in a compact tapered fibre.

Noel H Wan1, Fan Meng2, Tim Schröder3

  • 11] Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Department of Physics, Columbia University, New York, New York 10027, USA.

Nature Communications
|July 24, 2015
PubMed
Summary

Researchers developed a compact spectrometer using multimode fiber optics. This device offers high spectral resolution and a broad operating range, overcoming limitations of previous miniaturized spectrometers.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Materials Science

Background:

  • Optical spectroscopy is vital across scientific and technological fields.
  • Miniaturizing spectrometers often compromises spectral resolution and operating range.
  • Existing compact spectrometers face limitations in performance trade-offs.

Purpose of the Study:

  • To introduce a novel compact spectrometer design.
  • To achieve both high spectral resolution and a broad operating range in a miniaturized device.
  • To demonstrate the versatility of multimode interference spectroscopy.

Main Methods:

  • Utilizing imaging multimode interference from leaky modes in a tapered optical fiber.
  • Generating spectrally distinguishable spatial patterns.
  • Operating across a wide wavelength range (500–1,600 nm).

Main Results:

  • Achieved spectral resolution down to 40 pm (visible) and 10 pm (near-infrared).
  • Demonstrated resolving powers of 10^4–10^5.
  • Confirmed suitability for various device geometries, including planar waveguides.

Conclusions:

  • The tapered fiber multimode interference spectrometer offers a significant advancement in compact spectroscopy.
  • This technology overcomes previous limitations in miniaturization, offering high performance.
  • The multimode interference spectroscopy approach is adaptable to diverse material platforms.