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Plasmonic distributed feedback lasers at telecommunications wavelengths.

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|September 22, 2011
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Summary
This summary is machine-generated.

New metallic waveguides with nano-scale widths enable efficient distributed feedback (DFB) lasers. These gap-plasmon mode devices show suppressed spontaneous emission and reduced lasing thresholds, even at room temperature.

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Area of Science:

  • Optoelectronics
  • Nanophotonics
  • Materials Science

Background:

  • Distributed feedback (DFB) lasers are crucial for optical communications.
  • Conventional DFB lasers face limitations in miniaturization and efficiency.
  • Plasmonic waveguides offer sub-diffraction limit confinement but require efficient light-matter interaction.

Purpose of the Study:

  • To investigate electrically pumped DFB lasers utilizing gap-plasmon mode metallic waveguides.
  • To demonstrate the effectiveness of nano-scale metallic Bragg gratings for laser cavities.
  • To achieve reduced lasing thresholds and improved performance at room temperature.

Main Methods:

  • Fabrication of nano-scale metallic waveguides with integrated vertical groove Bragg gratings.
  • Characterization of the optical properties, including stop band bandwidth and grating coupling coefficients.
  • Experimental evaluation of spontaneous emission suppression and lasing performance under electrical pumping.

Main Results:

  • Metallic Bragg gratings exhibit a broad stop band (~500 nm) and high coupling coefficients (>5000/cm).
  • Significant suppression of spontaneous emission was observed within the Bragg grating cavities.
  • Reduced lasing thresholds, strong line narrowing, and super-linear light-current curves were achieved at room temperature.

Conclusions:

  • Gap-plasmon mode metallic waveguides with Bragg gratings are highly effective for DFB laser applications.
  • The demonstrated devices offer superior performance compared to conventional Fabry-Pérot cavities.
  • These findings pave the way for compact, efficient, and room-temperature plasmonic lasers.