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Standing Waves in a Cavity01:28

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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:
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Few-emitter lasing in single ultra-small nanocavities.

Oluwafemi S Ojambati1, Kristín B Arnardóttir2, Brendon W Lovett2

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Area of Science:

  • Optics and Photonics
  • Nanoscience and Nanotechnology

Background:

  • Miniaturizing lasers to nanocavities is crucial for reducing energy and material consumption.
  • Plasmonic nanocavities offer the smallest mode volumes but face challenges with low gain and high losses for few emitters.

Purpose of the Study:

  • To demonstrate and understand 'few emitter lasing' in plasmonic nanocavities, approaching the single-emitter limit.
  • To develop a theoretical framework for this non-standard lasing regime.

Main Methods:

  • Experimental demonstration of lasing in a plasmonic nanocavity with a few emitters.
  • Theoretical modeling extending weak-coupling theories to account for few-emitter dynamics.

Main Results:

  • Achieved 'few emitter lasing' in a plasmonic nanocavity near the single-molecule regime.
  • Observed significant broadening of the lasing transition, dependent on emitter number and location.
  • Validated a new theoretical approach to explain the observed phenomena.

Conclusions:

  • The study overcomes previous limitations in achieving lasing with few emitters in plasmonic nanocavities.
  • The findings enable the development of novel nanolaser applications.
  • Provides fundamental insights into light-matter interactions at the few-emitter limit.