The Manipulation Of Light Using The Electro-Optical Effect In The Optical Supperlattice

Light, as the basic particle, in terms of photons, has power, momentum and angular momentum. Meanwhile, light, as a wave, has amplitude, polarization and phase. This paper investigated the manipulation of light, such as the intensity, polarization, and the phase, using the periodically poled lithium niobate, based on the electro-optic effect and the polarization-coupling theory.During the manipulation of light intensity, we designed two novel devices, with one the Solc-type flat-top bandpass filter and the other flat-top electro-optical switch. By employing a higher electric field, a flat-top spectrum can be formed, which, compared with the conventional Solc-type filter, is more stable.Then we investigated the evolution of polarization and spin angular momentum under both the QPM and NQPM condition, and proposed a new method to control the optical polarization and the optical spin angular momentum. Compared with the previous methods using the bulk lithium niobate, this technique has higher precision and lower driven electric fleld.Finally, we make an analogy with the SHG cascading, and discover the polarization-coupling (PC) cascading effect. This PC cascading can lead to nonlinear phase shift and effective electro-optical Kerr coefficient which is fiver orders larger than that of the lithium niobate. We also propose the cross-phase-like modulation, that is, the phase of each wave is dependent on the relative power ratio instead of the power value, having potential in low-intensity all-optical process. This effect is also accompanied with slow light and fast light, demonstrated by the experiment.