Quantum second harmonic generation in terms of elementary processes

Article Optics

Modelling second harmonic generation at mid-infrared frequencies in waveguide integrated Ge/SiGe quantum wells

Giovanni Chesi et al.

Summary: A promising alternative to bulk materials for nonlinear optical field coupling is photonic integrated circuits based on asymmetric-coupled quantum wells, which have a huge nonlinear susceptivity but are affected by strong absorption. This study focuses on Second-Harmonic Generation in the mid-infrared spectral region using Ge-rich waveguides hosting p-type Ge/SiGe asymmetric-coupled quantum wells, and explores the efficiency in terms of phase mismatch effects and the trade-off between nonlinear coupling and absorption. The optimal density of quantum wells is identified to maximize SHG efficiency at feasible propagation distances, with conversion efficiencies of & AP; 0.6%/W achievable in waveguides of lengths of a few hundred μm only.

OPTICS EXPRESS (2023)

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Article Engineering, Electrical & Electronic

Efficient Second-Harmonic Generation in Si-GaP Asymmetric Coupled-Quantum-Well Waveguides

Francesco De Leonardis et al.

Summary: We present a theoretical investigation of efficient second harmonic generation in the cubic lattice-matched N-doped Si/GsP multiple quantum well system integrated in a strip waveguide in the silicon-on-insulator platform. The results show a giant second-order nonlinear optical susceptibility and a maximum conversion efficiency, obtained by engineering the quantum well structure and optimizing the resonance conditions.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2022)

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Article Physics, Multidisciplinary

Strongly Enhanced Second Harmonic Generation in a Thin Film Lithium Niobate Heterostructure Cavity

Shuai Yuan et al.

Summary: This study demonstrates strongly enhanced second harmonic generation on thin film lithium niobate, achieving a record high conversion efficiency compared to conventional thin film materials, which could inspire the miniaturization and integration in this field.

PHYSICAL REVIEW LETTERS (2021)

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Article Nanoscience & Nanotechnology

Second Harmonic Generation in Germanium Quantum Wells for Nonlinear Silicon Photonics

Jacopo Frigerio et al.

Summary: The study demonstrates strong second-harmonic generation in Ge-rich quantum wells grown on Si wafers, achieving double resonance through asymmetric coupled quantum wells. The giant second-order nonlinearity with high nonlinear susceptibility offers potential for more efficient optical devices on silicon photonics platforms.

ACS PHOTONICS (2021)

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Article Optics