2 天之前 · This paper reviews recent advancements in second harmonic generation (SHG) within nanostructures of lithium niobate on insulator (LNOI). SHG devices are classified into in-plane and out-of-plane configurations, highlighting their suitability for different pumping conditions.

2022年11月1日 · Among a variety of nonlinear optical processes, high-efficiency second harmonic generation (SHG) on-chip is particularly appealing and yet challenging. In this work, we present efficient SHG in...

2024年7月9日 · In this paper, we theoretically propose an efficient and flat broadband second harmonic generation (SHG) in silicon nitride loaded apodized chirped periodically poled LNOI waveguides.

2018年8月20日 · We demonstrate exceptionally high normalized second harmonic generation (SHG) efficiency of up to ηnor ≈ 460% W −1 cm −2, combined with a large phase matching bandwidth of Δ λ ≈ 100 nm...

Second-harmonic generation (SHG) in a Lithium Niobite - LiNbO3 (LNO) nanophotonic waveguide is studied using temperature modulation to achieve efficient phase matching. An analytic anisotropic material model allows us to sweep over temperature and wavelength; calculating the effective index of the fundamental and 2nd harmonic mode using FDE.

2021年1月15日 · We investigate the lateral leakage losses in X-cut and Z-cut LN for the fundamental (1550 nm) and second harmonic (775 nm) wavelengths. Our findings show that Z-cut lithium niobate on insulator (LNOI) is more likely to suffer from …

In this work, we propose and simulatively demonstrate a design of a z -cut few-micron-thick LNOI waveguide for broadband and efficient SHG, which accesses type-I mode phase matching between two fundamental modes, enabling a spatial mode overlap close to unity.

Thin-film lithium niobate (LN) has emerged as an ideal platform for efficient nonlinear wave-mixing processes due to its strong quadratic nonlinearity and high optical confinement. We demonstrate unprecedentedly efficient second-harmonic generation (SHG) in …

2023年10月23日 · High-efficiency second harmonic generation (SHG) relying solely on intermodal dispersion engineering remains a challenge. Here, we realize highly efficient SHG using a double-waveguide coupled racetrack microring resonator on X-cut lithium niobate on insulator (LNOI), where both pump and second harm …

We demonstrate unprecedentedly efficient second-harmonic generation (SHG) in a double-layer thin-film LN waveguide. The modal overlap between fundamental and second-harmonic waves is significantly enhanced by the polarization-reversed double layers, leading to a normalized conversion efficiency higher than 10,000% W−1 cm− 2 in theory.