Nanometer polarization system in ferroelectric material, polarization method and depolarization method

Abstract

The invention discloses a ferroelectric material internal nanometer polarization system, a polarization method and a depolarization method, and the polarization system comprises a femtosecond laser, a half-wave plate, a polarization beam splitter, a 4f optical system, a light shutter, a dichroscope, a microscope objective driven by a one-dimensional nanometer displacement table, a sample table driven by a three-dimensional nanometer displacement table, an illumination module and an imaging module. The polarization method and the depolarization method are realized based on the polarization system. The method is higher in precision, and three-dimensional reconstruction can be carried out.

Description

technical field [0001] The invention relates to polarization technology, in particular to a nanometer polarization system inside a ferroelectric material, a polarization method and a depolarization method. Background technique [0002] As an important branch of modern optics, nonlinear optics has a wide range of applications in the fields of information communication, information storage, imaging, and sensing. In nonlinear processes, such as frequency conversion processes, a large number of nonlinear optical materials are used. However, the inherent dispersive properties of the material greatly limit the conversion efficiency. The nonlinear photonic crystals with periodic second-order nonlinear coefficients can provide an inverse lattice vector to compensate for the wave vector mismatch in frequency conversion. This matching method is also called quasi-phase matching. The nonlinear photonic crystal needs to artificially control the ferroelectric domain orientation of the n...

AI Technical Summary

Problems solved by technology

The micron-scale domain structure can be obtained by ultraviolet exposure, and the sub-micron domain structure can be obtained by electron beam exposure. Due to the limitation of diffraction limit, it is theoretically impossible to realize infinitely small domain inversion.

In addition, techniques such as ultraviolet polarization, chemical diffusion, scanning probe polarization, electron beam polarization, and crystal growth have also been applied, but these methods can only prepare one-dimensional or two-dimensional nonlinear photonic crystals.

There are still huge challenges in the preparation of three-dimensional nano-nonlinear photonic crystals

However, the femtosecond nano-direct writing technology in the existing technology cannot be reconfigured, cannot break through the diffraction limit, and the direct writing accuracy needs to be further improved

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