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Optical trirefringence in photonic crystal waveguides.
M C Netti1, A Harris, J J Baumberg
1Department of Physics & Astronomy, University of Southampton, SO17 1BJ, United Kingdom.
Physical Review Letters
|April 6, 2001
Summary
We discovered optical trirefringence in 2D photonic crystals, a property impossible in standard materials. This allows light to pass through without disturbance at specific orientations, enabled by unique submicron patterning.
Area of Science:
- Photonics and Materials Science
- Optics and Electromagnetism
Background:
- Homogeneous nonmagnetic dielectrics exhibit optical birefringence, limiting light interaction.
- Photonic crystals offer unique optical properties due to their subwavelength structure.
Purpose of the Study:
- To demonstrate and experimentally verify optical trirefringence in 2D photonic crystals.
- To explore the potential of photonic crystals beyond conventional birefringence.
Main Methods:
- Fabrication of silicon-based mesostructures featuring photonic crystal waveguides within a Fabry-Perot cavity.
- Utilizing exact scattering matrix theory to analyze light-matter interactions.
Main Results:
- Experimental confirmation of optical trirefringence in 2D photonic crystals.
- Identification of six specific field orientations where incident light remains unperturbed.
- Demonstration that submicron dielectric patterning controls multirefringence.
Conclusions:
- 2D photonic crystals exhibit optical trirefringence, a phenomenon forbidden in homogeneous dielectrics.
- This advanced optical property arises from engineered subwavelength structures.
- The findings open new avenues for light manipulation in optical devices.