Integrated Photonic Sources and Circuits in Lithium Niobate Platform

Lin, Yixin; Lee, Chieh-Hsun; Chung, Hung-Pin; Younesi, Mohammadreza; Kumar, Pawan; Wang, Kai; Bernard, Olivier; Shirpurkar, Chinmay; Su, Wen-Chiuan; Geiß, Reinhard; Pertsch, Thomas; Sukhorukov, Andrey A.; Setzpfandt, Frank; Chen, Yen-Hung

doi:10.1364/oecc.2021.t2d.2

Cited by 1 publication

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“…These applications include the efficient generation of entangled photon pairs [14], efficient frequency conversion [15] and modulation, as well as precise photon detection. These effects can be realized by exploiting the exceptional properties of LNOI [16], [17] which rely on the phase matching condition. The condition can be relaxed through the quasi-phase matching in periodically poled structures, which allows the compensation of the phase mismatch due to the refractive index dispersion by periodically arranged domains of the LNOI crystal [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Phase Matching in Microstructured Lithium Niobate on Insulator Waveguides

et al. 2023

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The recent development of the Lithium Niobate on Insulator (LNOI) fabrication process has opened a bright future for integrating ultra-compact photonic circuits. Due to its excellent nonlinear properties, as a waveguide material, Lithium Niobate supports nonlinear optical processes including efficient sum frequency generation and second harmonic generation. To enhance these effects, precise control of mode confinement and modal phase matching is required. In this work, we engineer an LNOI waveguide to match the effective refractive indices of the fundamental mode, TE 00 at the fundamental wavelength and secondorder mode, TE 20 at the second harmonic wavelength. As waveguide geometry plays an essential role, optimization of waveguide parameters is crucial for the design of high-performance, feasible devices. Here, we numerically engineer and characterize the influence of rib waveguide geometry parameters including etching depth, D, width, W and sidewall angle, θ on the phase matching condition. We find that the waveguide phase matching condition is most susceptible to variations in the sidewall angle. For the optimized parameter values of {D, θ} = {450 nm, 10 o }, the phase-matching wavelength tunability is achieved through the waveguide width control.

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