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Fabrication of Silica Ultra High Quality Factor Microresonators
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Published on: July 2, 2012

Berry phase magnification in optical microcoil resonators.

Timothy Lee1, Neil G R Broderick, Gilberto Brambilla

  • 1Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United Kingdom. tl305@orc.soton.ac.uk

Optics Letters
|August 3, 2011
PubMed
Summary

The Berry phase significantly magnifies optical shifts in microcoil resonators, causing measurable polarization rotation. These findings reveal new insights into optical activity and resonator performance.

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Area of Science:

  • Optics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Optical microcoil resonators are key components in various photonic devices.
  • Understanding polarization effects is crucial for optimizing resonator performance.
  • Previous models often neglected the Berry phase's influence on resonator properties.

Purpose of the Study:

  • To investigate the impact of the Berry phase on the linear transmission properties of optical microcoil resonators.
  • To analyze resonant behavior considering various input polarizations and coil geometries.
  • To evaluate the Berry phase's contribution to polarization rotation and its effect on resonator performance metrics.

Main Methods:

  • Theoretical modeling of optical microcoil resonators.
  • Analysis of resonant behavior under different polarization states.
  • Inclusion of elasto-optic bend birefringence and polarization-dependent coupling coefficients in the model.

Main Results:

  • The Berry phase shift is significantly magnified on resonance, leading to measurable polarization rotation in specific geometries.
  • Observable Berry phase effects persist even when considering previously neglected factors like elasto-optic bend birefringence.
  • A three-turn microcoil demonstrated nearly 100% cross-polarization coupling due to Berry phase effects.

Conclusions:

  • The Berry phase plays a significant role in the optical activity of microcoil resonators.
  • Cross-polarization coupling, influenced by the Berry phase, impacts extinction ratio and quality factor.
  • This research highlights the importance of considering the Berry phase for advanced optical resonator design.