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Published on: November 30, 2012
Nonlinear Cerenkov radiation in nonlinear photonic crystal waveguides
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China.
Physical Review Letters
|June 4, 2008
Summary
Researchers observed novel nonlinear Cerenkov radiation in photonic crystal waveguides. This phenomenon, driven by nonlinear polarization, results in unique harmonic wave emissions and multiple radiation spots.
Area of Science:
- Nonlinear optics
- Photonics
- Condensed matter physics
Background:
- Nonlinear Cerenkov radiation is a key phenomenon in optics.
- Photonic crystal waveguides offer unique light manipulation properties.
- Ferroelectric domain modulation influences nonlinear optical effects.
Purpose of the Study:
- To investigate nonlinear Cerenkov radiation in a nonlinear photonic crystal waveguide.
- To explore the impact of ferroelectric domain modulation on harmonic wave generation.
- To observe and analyze novel nonlinear optical phenomena.
Main Methods:
- Utilizing a nonlinear photonic crystal waveguide with ferroelectric domain modulation.
- Analyzing nonlinear polarization driven by an incident light field.
- Observing harmonic wave emission along Cerenkov angles.
Main Results:
- Coherent emission of harmonic waves at new frequencies was observed.
- Multiple radiation spots with different azimuth angles were simultaneously exhibited.
- A novel scattering-involved nonlinear Cerenkov arc was observed for the first time.
Conclusions:
- Quasi-phase matching in nonlinear Cerenkov radiation leads to novel nonlinear phenomena.
- Hexagonally poled waveguides enable unique multi-spot radiation patterns.
- The study demonstrates new possibilities for nonlinear optical devices.
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