Tunable plasmon-enhanced second-order optical nonlinearity in transition metal dichalcogenide nanotriangles

Article

关键词: SCHRODINGER-EQUATION;    HARMONIC-GENERATION;    LITHIUM-NIOBATE;    MOS2;    COHERENT;    PARTICLE;   

DOI  :  10.1103/PhysRevB.103.L161401

来源: SCIE

【 摘 要 】

The development of nanomaterials with a large nonlinear susceptibility is essential for nonlinear nanophotonics. We show that transition metal dichalcogenide (TMD) nanotriangles have a large effective second-order susceptibility [chi((2))] at midinfrared to near-infrared frequencies owing to their broken centrosymmetry. chi((2)) is calculated within the density-matrix formalism that accounts for dissipation and screening. chi((2)) peaks in the vicinity of both two-photon resonances (specified by the geometry) and plasmon resonances (tunable via the carrier density). Aligning the resonances yields the values of chi((2)) as high as 10(-6) m/V. These findings underscore the potential of TMD nanotriangles for nonlinear nanophotonics, particularly second-harmonic generation.

【 授权许可】

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