Fig. 3: Determination of the quasi-BIC. | Nature Communications

Fig. 3: Determination of the quasi-BIC.

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

Fig. 3

a Two-photon-induced absorption (TPA) spectra (\(\frac{1}{V}\int {\left|E\right|}^{4}{{{{{\rm{dV}}}}}}\) spectra) calculated for Si/SiO2 cuboids with w = 360 nm and different lengths. ED, MD, MO represent electric dipole, magnetic dipole, and magnetic octupole, respectively. The TPA and scattering spectra calculated for Si/SiO2 cuboids with l = 740 and 780 nm are shown in b, c. The excitation spectra measured for Si/SiO2 cuboids with l = 740 and 780 nm are shown in d, e, respectively. In each case, the scattering spectrum is also provided for reference.

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