Resonance in Modulation Instability from Non-Instantaneous Nonlinearities
Ray-Ching Hong1*, Chun-Yan Lin1, You-Lin Chuang2, Chien-Ming Wu1, Yonan Su1, Chien-Chung Jeng3, Ming-Feng Shih4, Ray-Kuang Lee1,2,5
1Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, Taiwan
2Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan
3Department of Physics, National Chung-Hsing University, Taichung, Taiwan
4Department of Physics, National Taiwan University, Taipei, Taiwan
5Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
* Presenter:Ray-Ching Hong, email:s9021652@yahoo.com.tw
To explore resonance phenomena in the nonlinear region, we show by experimental measurements and theoretical analyses that resonance happens in modulation instability (MI) from non-instantaneous nonlinearities in photorefractive crystals. With a periodic modulation in the external bias voltage, corresponding to a modulation in the nonlinear strength, an enhancement in the visibility of MI at resonant frequency is reported through spontaneous optical pattern formations. By modeling a nonlinear driving force to the system, theoretical curves obtained from a nonlinear non-instantaneous Schrodinger equation give good agreement to experimental data. As MI is a universal signature of symmetry-breaking phenomena, our observation on the resonance in MI provides a control on chaotic, solitary, and turbulence waves.


Keywords: resonance, modulation instability, photo-refractive crystals