A type of molybdenum disulfide (MoS2) nanoparticles (NPs) are chemically synthesized, which possess curved features as three-dimension (3D) freedom compared with planar two-dimension (2D) materials. Due to the introduction of...
A type of MoS2 nanoparticle with a spherical‐like shape is chemically synthesized with favorable third‐order and suppressed second‐order nonlinear optical response, which results from the isotropy induced by the geometrical uniformity of nanoparticles and an artificial symmetry center. It is found that the linewidth of third harmonic signal is broadened due to the self‐phase modulation effect, another third‐order nonlinearity. Moreover, the intensity of harmonic signal can be conveniently adjusted by controlling the polarization state of applied optical field. The artificially designed material morphology may provide a reference for designing all‐optical modulation devices.
Active control of light polarization at the nanoscale is essential for integrated photonic devices. Here, an all-optical approach is proposed to tune the polarization state of near-infrared light using a nonlinear metasurface. Based on the large intensity-dependent refractive index change of epsilon-near-zero (ENZ) materials, a phase difference between two orthogonal electric fields at ENZ wavelength can be continuously tuned in a range larger than 0.61π by varying the incident light power. The polarization state of the reflected light can thus be actively tuned from linear to circular state via an all-optical approach. Notably, abundant polarization states can be obtained by altering the polarization angle of incident light. The proposed all-optical approach is promising for tunable photonic functionalities of practical applications.
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