Enhanced second harmonic generation in lithium niobate hexagonal micro-resonator via total internal reflection quasi-phase-matching

摘要

An efficient scheme for enhanced second harmonic generation in a nonlinear optical hexagonal microcavity by the combined mechanisms of total internal reflection and quasi-phase-matching is proposed. We demonstrate the operational principle by numerical simulation results showing resonance operation in a suitably designed hexagonal optical microresonator, revealing thus the operating feasibility of the proposed scheme in nonlinear material platforms such as Lithium Niobate. The fabrication of high optical quality hexagonal superstructures by chemical etching of inverted ferroelectric domains in this Lithium Niobate platform suggests a route for successful implementation. Design aspects, optimization issues and characteristics of the proposed device are presented.