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Tailoring Čerenkov second-harmonic generation in bulk nonlinear photonic crystal
Yan Sheng1, Vito Roppo, Qian Kong
1Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia. ysh111@physics.anu.edu.au
Optics Letters
|July 5, 2011
Summary
We theoretically demonstrate Čerenkov-type second-harmonic generation in nonlinear photonic crystals. This method enables simultaneous multi-directional emission, with controllable angles and maximized efficiency through specific domain patterns.
Area of Science:
- Nonlinear optics
- Photonics
- Materials science
Background:
- Čerenkov radiation is a fundamental phenomenon in nonlinear optics.
- Second-harmonic generation (SHG) is crucial for frequency conversion.
- Controlling SHG emission directionality is key for photonic device applications.
Purpose of the Study:
- To theoretically investigate Čerenkov-type SHG in a 2D nonlinear photonic crystal.
- To explore the effect of longitudinal modulation of nonlinear susceptibility (χ((2))) on SHG.
- To achieve controllable, efficient, and multi-directional SHG emission.
Main Methods:
- Theoretical modeling of nonlinear optical phenomena.
- Analysis of Čerenkov radiation in periodically poled nonlinear photonic crystals.
- Simulation of second-harmonic generation with modulated nonlinear susceptibility.
Main Results:
- Demonstrated simultaneous Čerenkov-type SHG in multiple directions with comparable intensities.
- Showed that emission angles are controllable via spatial modulation of the nonlinear susceptibility.
- Proposed a periodically poled domain pattern design to maximize SHG efficiency.
Conclusions:
- Longitudinal modulation of nonlinear susceptibility offers precise control over SHG emission.
- The proposed design provides a pathway for highly efficient, multi-directional frequency conversion.
- This work advances the understanding and application of nonlinear photonic crystals.
