Work

Modal phase matching in z-cut dual-layered lithium niobate rib waveguide for second harmonic generation

Year: 2025

Type: article

Abstract: We report a comprehensive investigation of modal phase matching in z-cut dual-layered thin-film lithium niobate rib waveguides, emphasizing geometrical dispersion engineering for efficient second harmonic generation. Through systematic analysis, we examine the influence of waveguide cross-sectional dimensional variations on phase-matching conditions and conversion efficiency. Our findings reveal that the phase-matching wavelength exhibits substantially greater sensitivity to thickness fluctuations compared to variations in waveguide width and etch depth. By exploiting modal phase matching in z-cut thin-film lithium niobate, we demonstrate second harmonic generation with conversion efficiencies reaching the order of 10 3 % W -1 cm -2 . Our findings provide new insights into the optimization of optical frequency conversion processes and present significant potential for advancing on-chip nonlinear photonic devices based on thin-film lithium niobate platforms.

Source: Optics Express

DOI: 10.1364/oe.557287

Authors: Haoyang Du, Xiuquan Zhang, Lei Wang, Feng Chen

Institution: Shandong University

Language: English

Topic: Photorefractive and Nonlinear Optics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Natural Science Foundation of China, Natural Science Foundation of Shandong Province, National Key Research and Development Program of China