Fig. 2: Scattering properties of Si/SiO2 cuboids and the magnetic field distribution at the quasi-BIC. | Nature Communications

Fig. 2: Scattering properties of Si/SiO2 cuboids and the magnetic field distribution at the quasi-BIC.

From: Highly efficient nonlinear optical emission from a subwavelength crystalline silicon cuboid mediated by supercavity mode

Fig. 2

a Scattering spectra calculated for Si/SiO2 cuboids with variable length l and fixed width w = 300 nm and height h = 230 nm, the thicknesses of the outer SiO2 layer in the x, y, z directions are chosen to be tx = 75 nm, ty = 50 nm, and tz = 70 nm. b Scattering spectrum calculated for the Si/SiO2 cuboid with l = 596 nm, w = 300 nm and h = 230 nm, which has been decomposed into the contributions of the Mie resonances of different orders. c Scattering spectra measured for Si/SiO2 cuboids with the same width of w ~ 300 nm and different lengths. The length of the Si/SiO2 cuboid supporting the quasi-BIC is indicated by the dashed line. d Scattering spectrum measured for a Si/SiO2 cuboid with l ~ 590 nm and w ~ 300 nm. The scattering peaks corresponding to the ED, quasi-BIC, and MD resonances are marked by colored regions. e–g, Magnetic field distributions calculated for the Si/SiO2 cuboid with l = 596 nm and w = 300 nm at different wavelengths of 691, 693, and 695 nm. The magnetic vectors corresponding to the magnetic field distributions are shown in h–j. Here, ED, F-P, MD, MO represent electric dipole, Fabry-Perot mode, magnetic dipole, and magnetic octupole, respectively.

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