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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

940
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
940

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Room-temperature continuous-wave topological Dirac-vortex microcavity lasers on silicon.

Jingwen Ma1,2, Taojie Zhou2,3, Mingchu Tang3

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.

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|October 23, 2023
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Researchers developed topological Dirac-vortex microcavity lasers using quantum dots on silicon. These robust lasers demonstrate stable telecom-wavelength emission, defying conventional scaling laws for future integrated photonic systems.

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Area of Science:

  • Optics and Photonics
  • Condensed-Matter Physics
  • Materials Science

Background:

  • Topology concepts from condensed-matter physics are revolutionizing laser design for enhanced robustness.
  • Dirac-vortex states, inspired by Majorana fermions, show promise for creating stable photonic systems.
  • Developing robust, on-chip lasers is crucial for advanced information technologies.

Purpose of the Study:

  • To experimentally realize topological Dirac-vortex microcavity lasers.
  • To investigate the robustness and scaling properties of these novel laser systems.
  • To demonstrate their potential for integration into silicon photonics.

Main Methods:

  • Monolithic growth of InAs/InGaAs quantum-dot materials on a silicon substrate.
  • Fabrication of topological Dirac-vortex microcavity laser structures.
  • Experimental characterization of laser emission at room temperature.

Main Results:

  • Successful room-temperature, continuous-wave, linearly polarized vertical laser emission at a telecom wavelength.
  • Demonstrated topological robustness of the laser wavelength against cavity size variations.
  • Observed defiance of the universal inverse scaling law for the free spectral range with cavity size.

Conclusions:

  • Topological Dirac-vortex microcavity lasers are experimentally realized in quantum-dot-on-silicon material systems.
  • These lasers exhibit unique robustness and scaling properties, offering advantages over conventional designs.
  • The developed technology is vital for advancing CMOS-compatible photonic and optoelectronic systems on a chip.