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Dielectric shielded nanoscale patch laser resonators.

Qian Ding1, Amit Mizrahi, Yeshaiahu Fainman

  • 1Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.

Optics Letters
|May 20, 2011
PubMed
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Researchers developed new nanoscale patch laser resonators using dielectric shielding to minimize losses. These compact lasers can operate at room temperature and integrate with waveguides for chip-scale applications.

Area of Science:

  • Photonics and Nanotechnology
  • Optoelectronics

Background:

  • Conventional nanoscale lasers suffer from significant optical losses, limiting their efficiency and performance.
  • Radiation and metal losses are key challenges in designing compact laser resonators.

Purpose of the Study:

  • To introduce dielectric shielded nanoscale patch laser resonators.
  • To demonstrate significant reduction in optical losses using low-index dielectric shielding.
  • To enable room-temperature lasing in sub-wavelength resonators.

Main Methods:

  • Fabrication of nanoscale patch resonators with a high-index core and low-index dielectric shield.
  • Theoretical and experimental analysis of optical losses (metal and radiation).
  • Investigation of resonator structures for optical and electrical pumping.

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Main Results:

  • Low-index dielectric shields effectively reduce both metal and radiation losses.
  • Sub-wavelength resonators achieve low threshold gain for room-temperature lasing.
  • Tunable radiation patterns and waveguide coupling are achieved by shifting the gain medium.

Conclusions:

  • Dielectric shielding is a promising strategy for efficient nanoscale laser design.
  • These resonators offer a pathway towards compact, integrated photonic circuits.
  • The technology supports both optical and electrical pumping for versatile applications.