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Optical vortices at Fano resonances
Yi Xu1, Andrey E Miroshnichenko, Anton S Desyatnikov
1Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia.
Optics Letters
|December 4, 2012
Summary
We found that Fano resonance in coupled systems creates optical vortices with controllable handedness. This interference effect links energy flux vorticity and resonance phenomena in various optical structures.
Area of Science:
- Condensed matter physics
- Photonics
- Wave phenomena
Background:
- Fano resonance arises from quantum interference, leading to sharp asymmetric spectral lines.
- Optical vortices are beams with helical wavefronts, carrying orbital angular momentum.
- Understanding energy flux behavior in structured media is crucial for optical device design.
Purpose of the Study:
- To investigate the relationship between Fano resonance and optical vortex generation in a 1D array.
- To demonstrate geometry-induced vorticity of energy flux.
- To explore the tunability of optical vortex handedness via Fano resonance.
Main Methods:
- Theoretical analysis of a one-dimensional array with an intersite side-coupled defect.
- Numerical simulations to observe energy flux patterns and optical vortex formation.
- Examination of transmission properties across a range of frequencies.
Main Results:
- Sharp Fano resonance was observed in the transmission spectrum.
- Geometry-induced vorticity of the energy flux was demonstrated.
- The optical vortex inverted its handedness precisely at the Fano resonance frequency.
- A strong link between Fano resonance and optical vortex handedness, both originating from interference, was established.
Conclusions:
- Fano resonance can induce and control optical vortex handedness in coupled systems.
- The observed phenomena are rooted in interference effects and are generalizable.
- The approach is applicable to diverse systems, including photonic crystals.
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