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High-resolution optical spectroscopy using multimode interference in a compact tapered fibre

Author

Listed:
  • Noel H. Wan

    (Massachusetts Institute of Technology
    Columbia University)

  • Fan Meng

    (Massachusetts Institute of Technology
    State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications)

  • Tim Schröder

    (Massachusetts Institute of Technology)

  • Ren-Jye Shiue

    (Massachusetts Institute of Technology)

  • Edward H. Chen

    (Massachusetts Institute of Technology)

  • Dirk Englund

    (Massachusetts Institute of Technology)

Abstract

Optical spectroscopy is a fundamental tool in numerous areas of science and technology. Much effort has focused on miniaturizing spectrometers, but thus far at the cost of spectral resolution and broad operating range. Here we describe a compact spectrometer that achieves both high spectral resolution and broad bandwidth. The device relies on imaging multimode interference from leaky modes along a multimode tapered optical fibre, resulting in spectrally distinguishable spatial patterns over a wide range of wavelengths from 500 to 1,600 nm. This tapered fibre multimode interference spectrometer achieves a spectral resolution down to 40 pm in the visible spectrum and 10 pm in the near-infrared spectrum (corresponding to resolving powers of 104–105). Multimode interference spectroscopy is suitable in a variety of device geometries, including planar waveguides in a broad range of transparent materials.

Suggested Citation

  • Noel H. Wan & Fan Meng & Tim Schröder & Ren-Jye Shiue & Edward H. Chen & Dirk Englund, 2015. "High-resolution optical spectroscopy using multimode interference in a compact tapered fibre," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8762
    DOI: 10.1038/ncomms8762
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