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Optical circulation in a multimode optomechanical resonator.

Freek Ruesink1, John P Mathew1, Mohammad-Ali Miri2

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This study demonstrates a novel optical circulator using radiation pressure in an optomechanical system. This non-magnetic approach achieves efficient, reconfigurable light routing for integrated nanophotonics.

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Area of Science:

  • Photonics
  • Quantum Optics
  • Nanotechnology

Background:

  • Circulators are essential nonreciprocal components for directional light routing in photonic circuits.
  • Existing circulators often rely on magnetic fields, limiting miniaturization and reconfigurability.
  • Developing compact, magnetic-field-free circulators is crucial for advanced photonic applications.

Purpose of the Study:

  • To demonstrate optical circulation using radiation pressure interactions in an on-chip optomechanical system.
  • To achieve efficient and reconfigurable nonreciprocal light routing without external magnetic fields.
  • To explore the potential of optomechanical systems for integrated nanophotonic circuits.

Main Methods:

  • Utilizing a silica microtoroid to create an on-chip multimode optomechanical system.
  • Employing mechanically mediated optical mode conversion to induce synthetic gauge bias for light.
  • Exploiting tailored interference between light paths under specific sideband conditions.

Main Results:

  • Experimental demonstration of four-port optical circulation.
  • Achieved approximately 10 dB isolation and less than 3 dB insertion loss across relevant channels.
  • Showcased active control over circulator properties.

Conclusions:

  • Optomechanical systems can effectively break electromagnetic wave propagation symmetry for circulation.
  • The demonstrated method offers a promising, magnetic-field-free approach for compact and reconfigurable circulators.
  • This work opens opportunities for advanced integrated nanophotonic circuits and fundamental research in electromagnetic transport.