Compact Second-Harmonic Generation in the C‑Exciton Band of 3R-MoS₂ for Integrated Quantum Photonics.

ABSTRACT: We present a novel scheme for highly efficient second-harmonic generation in the visible spectrum using minimal volumes of 3R-phase molybdenum disulfide (MoS₂) integrated on a silicon nitride (Si₃N₄) ridge waveguide. The device is designed to operate near the C-exciton resonance of MoS₂, where the material exhibits its strongest second-order nonlinear response. A periodic array of nanometric MoS₂ stripes is patterned on the waveguide surface to form a one-dimensional photonic crystal, enabling strong field localization at the pump wavelength (λ_FF ≈ 890 nm) near the photonic band edge. This leads to resonant second-harmonic emission around 445 nm, close to the highly absorbing C-exciton. To mitigate the absorption while maint

SUBMITTER: Bile A 

PROVIDER: S-EPMC12787318 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature