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Optically Controlled Orbital Angular Momentum Generation in a Polaritonic Quantum Fluid.

S M H Luk1, N H Kwong2, P Lewandowski3

  • 1Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.

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|September 27, 2017
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Summary

We developed a micron-sized semiconductor source creating predefined orbital angular momentum (OAM) light pairs. This novel polaritonic quantum fluid system harnesses modulational instabilities for spontaneous OAM generation and unique flow patterns.

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Area of Science:

  • Quantum optics
  • Semiconductor physics
  • Photonics

Background:

  • Orbital angular momentum (OAM) of light has diverse applications in optical communications, imaging, and particle manipulation.
  • Existing methods for generating OAM light often rely on specific laser sources and configurations.

Purpose of the Study:

  • To propose and demonstrate a novel micron-sized semiconductor source for generating predefined orbital angular momentum (OAM) pairs.
  • To investigate the control of modulational instabilities in a polaritonic quantum fluid for spontaneous OAM pair formation.

Main Methods:

  • Utilizing a micron-sized semiconductor source based on a polaritonic quantum fluid.
  • Controlling modulational instabilities within the quantum fluid.
  • Observing the spontaneous formation of OAM pairs not present in the pump laser.

Main Results:

  • Demonstrated spontaneous formation of OAM pairs in a polaritonic quantum fluid.
  • Observed unique generation-annihilation flow patterns of OAM states.
  • Highlighted that these phenomena occur in open systems, distinct from equilibrium condensates.

Conclusions:

  • The proposed semiconductor source offers a new pathway for generating tailored OAM light.
  • The control of modulational instabilities in polaritonic fluids enables novel OAM manipulation.
  • The observed exotic flow patterns in open quantum systems expand our understanding of light-matter interactions.