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Low-threshold supercontinuum generation in semiconductor nanoribbons by continuous-wave pumping.

Fuxing Gu1, Huakang Yu, Wei Fang

  • 1State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.

Optics Express
|April 20, 2012
PubMed
Summary

We achieved supercontinuum generation in semiconductor nanoribbons, a first. This breakthrough enables low-threshold nanoscale light sources with potential applications in imaging and research.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Supercontinuum (SC) generation is a nonlinear optical phenomenon crucial for various applications.
  • Previous SC generation methods, particularly in glass fibers, often require high pump power thresholds.
  • Semiconductor nanostructures offer unique optical properties for light manipulation.

Purpose of the Study:

  • To demonstrate supercontinuum generation in single semiconductor nanoribbons (NRs).
  • To investigate the feasibility of low-threshold SC sources using nanoribbon waveguides.
  • To explore the potential applications of nanoribbon-based SC generation.

Main Methods:

  • Utilizing a continuous wave (CW) 532-nm pump laser.
  • Launching the pump light into a 200-μm-length Cadmium Sulfide (CdS) nanoribbon for waveguiding.

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  • Characterizing the generated supercontinuum spectrum.

    • Main Results:

    • Achieved the first observation of SC generation in single semiconductor nanoribbons.
    • Demonstrated SC generation with a threshold as low as sub-milliwatt, approximately three orders of magnitude lower than in glass fibers.
    • Identified high Raman gains, strong light confinement, and numerous optical/phonon modes as contributing factors to the low threshold.

    Conclusions:

    • Established semiconductor nanoribbons as a viable platform for low-threshold SC generation.
    • Paved the way for the development of compact and efficient nanoscale SC sources.
    • Highlighted potential applications in spectroscopic analysis, biological imaging, and material research.