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• W4308462482 abstract "The GaSe/silicon metasurface bilayer system allows a much wider range of wavelengths for sum-frequency generation, enabling the detection of longer wavelength infrared photons by firstly converting them to shorter wavelength photons, where the detection and imaging technology is mature. • Silicon metasurface with Toroidal dipole resonance in the infrared band is studied. A high Q value is obtained without breaking the symmetry. • The toroidal dipole radiation is studied at different geometries of the metasurface, to analyze the effect of structural parameters on the Toroidal dipole resonance effect. • The sum-frequency generation is studied in the silicon metasurface/two-dimensional nonlinear material (GaSe) bilayer structure, to efficiently upconvert long-wave infrared to short-wave infrared light realized by the toroidal dipole resonance. • The sum-frequency generation in combination with the toroidal dipole resonance allows a huge enhancement in the upconversion efficiency by a factor of nearly a thousand times, paving the way to detect long-wave infrared by detecting the short-wave infrared light using mature technologies. Optical resonances supported by subwavelength nanostructures have significant local-field enhancement effects and are important in the field of nanophotonics such as photoemission and nonlinear optics. In this paper, silicon metasurface with toroidal dipole resonance in the short-wave infrared band is investigated. The formation and properties of the high-quality toroidal dipole resonance are analyzed in detail by the near- and far-field analysis, and the electromagnetic multipole decomposition methods in the metasurface with different structural parameters. In addition, a layer of two-dimensional nonlinear material GaSe is combined with the silicon metasurface, to enhance the long-wave infrared to short-wave infrared upconversion by the nonlinear sum-frequency generation (SFG) process through toroidal dipole resonance. The upconversion efficiency in the GaSe/ silicon metasurface bilayer system is nearly a thousand times more than that in the GaSe/planar silicon bilayer system, indicating the effectiveness of the toroidal dipole resonance generated by the metasurface. This method provides a feasible and viable strategy for upconverting mid-wave infrared or long-wave infrared to near- or short-wave infrared by the nonlinear process induced by the metasurface, which is potentially very attractive for the sensing and imaging of long-wavelength photons that beyond the capability of mature silicon/germinium detectors." @default.
• W4308462482 created "2022-11-12" @default.
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• W4308462482 date "2023-02-01" @default.
• W4308462482 modified "2023-10-04" @default.
• W4308462482 title "Long-wave infrared to short-wave infrared upconversion through sum-frequency generation in a silicon symmetric metasurface integrated with two-dimensional material" @default.
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• W4308462482 doi "https://doi.org/10.1016/j.apsusc.2022.155619" @default.
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