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Brillouin Scattering Selection Rules in Polarization-Sensitive Photonic Resonators
Anne Rodriguez1, Priya Priya1, Edson R Cardozo de Oliveira1
1Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France.
ACS Photonics
|June 26, 2023
Summary
Researchers manipulated light polarization using elliptical micropillars to measure acoustic phonons. This novel polarization-based filtering technique accesses previously inaccessible phonon frequencies, advancing optical spectroscopy.
Area of Science:
- Solid-state physics
- Optical spectroscopy
- Nanophotonics
Background:
- Spontaneous Brillouin scattering (SBS) in solids is limited by intrinsic polarization selection rules.
- Standard SBS and Raman spectroscopies have limitations in accessing certain acoustic phonon frequencies.
Purpose of the Study:
- To overcome polarization constraints in Brillouin scattering.
- To develop a technique for measuring high-frequency acoustic phonons.
- To enable new applications in optomechanics and quantum optics.
Main Methods:
- Utilized polarization-sensitive optical resonances in elliptical micropillars.
- Independently manipulated excitation laser and Brillouin signal polarization states.
- Employed a wavelength-dependent polarization rotation and filtering technique.
Main Results:
- Successfully measured acoustic phonons at frequencies difficult to access with conventional methods.
- Demonstrated independent control over excitation and signal polarization.
- Established a novel polarization-based filtering technique for Brillouin scattering.
Conclusions:
- The developed technique overcomes intrinsic polarization selection rules in Brillouin scattering.
- This method allows for the study of acoustic phonons at previously inaccessible frequencies.
- The technique is extendable to various polarization-sensitive nanostructures and has broad applications.
