Topological boundary state regulation and control and harmonic frequency generation device based on voltage regulation

Abstract

The invention discloses a topological boundary state and harmonic frequency generation device based on lithium niobate voltage regulation and control. The lithium niobate is orderly arranged in a free space according to a specific interval period. Positive voltage and negative voltage are respectively applied to the left side and the right side of lithium niobate, and the refractive index of the lithium niobate material can be changed by utilizing an electro-optical modulation effect. Different from previous researches, the nonlinear optical effect is enhanced due to the fact that the topological structure has a strong local field at the boundary. Besides, topological boundary states generated by the structure are uniformly distributed in an arithmetic progression manner, which means that when the fundamental frequency light is in one boundary mode, the harmonic frequency light is also in a topological boundary state mode, so that all generated harmonic frequency light is immune to impurities or defects in the structure and has no backscattering, and the structure is protected by topology. The nonlinear optical effect based on the topology protection state provides a new way for generation of higher harmonics and generation of other nonlinear optical effects.

Description

technical field [0001] Specifically, the present invention relates to the field of nonlinear topological photonics. In particular, a device for topological boundary state regulation and harmonic frequency generation based on voltage regulation. Background technique [0002] In recent years, the proposal of optical topology has aroused strong research interest. The concept of optical topology derives from topological insulators, which are bulk-insulating, surface-conducting structures. The topological properties of this structure are determined by the bulk structure, and it has the unique property of being immune to structural impurities and defects, and has been used in many optical studies, such as laser cavities, gratings, metasurfaces, and waveguide structures. The application of topology in optics enables light to turn at any angle or transmit around obstacles, and suppresses backscattering, reduces heat loss, and greatly improves light transmission efficiency. Topolo...

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Problems solved by technology

Different from previous studies, the topological boundary states generated by this patent are uniformly distributed at equal intervals, which makes it possible to generate high-order harmonics protected by topology

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