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Multi-directional Čerenkov second harmonic generation in two-dimensional nonlinear photonic crystal
Yan Sheng1, Vito Roppo, Mingliang Ren
1Laser Physics Center, Research School of Physics and Engineering, Australian National University, ACT 0200, Australia. ysh111@physics.anu.edu.au
Optics Express
|March 16, 2012
Summary
We demonstrate novel control over Čerenkov radiation emission angles in quasi-periodically poled lithium niobate. This nonlinear optics advance allows tailoring light direction by modifying material properties.
Area of Science:
- Nonlinear Optics
- Materials Science
- Solid State Physics
Background:
- Čerenkov radiation is a fundamental phenomenon in nonlinear optics, typically emitted in a single cone.
- Lithium niobate (LiNbO3) is a key material for nonlinear optical applications due to its strong second-order nonlinearity.
- Quasi-periodic poling offers advanced control over nonlinear optical processes.
Purpose of the Study:
- To investigate Čerenkov-type second-harmonic generation in a two-dimensional quasi-periodically poled LiNbO3 crystal.
- To explore a new interaction geometry for observing multi-directional nonlinear Čerenkov radiation.
- To demonstrate control over the emission angle of Čerenkov radiation.
Main Methods:
- Utilized a two-dimensional quasi-periodically poled LiNbO3 crystal.
- Employed a novel interaction geometry to excite nonlinear Čerenkov radiation.
- Analyzed the spectral and angular characteristics of the generated second-harmonic radiation.
Main Results:
- Observed simultaneous emission of multi-directional nonlinear Čerenkov radiation.
- Achieved comparable intensities for the multi-directional emission.
- Demonstrated that the emission angle can be controlled by tailoring the material's nonlinearity.
Conclusions:
- The study presents a new method for generating and controlling multi-directional Čerenkov radiation.
- Tailoring the material's nonlinear properties offers a pathway to precisely control Čerenkov emission angles.
- This work advances the understanding and application of nonlinear optical phenomena in engineered photonic materials.
