Fig. 5: Out-of-plane confinement of the enhanced partial local density of optical states (PLDOS). | Nature Communications

Fig. 5: Out-of-plane confinement of the enhanced partial local density of optical states (PLDOS).

From: Near-field probing of the local density of optical states enhanced by bound states in the continuum in nonlocal metasurfaces

Fig. 5

a THz transients and b THz amplitude spectra measured by the near-field microprobes Ey and Ex, respectively. The measured points are (90 μm, 250 μm) for y-polarization (y-pol) and (180 μm, 210 μm) for x-polarization (x-pol), corresponding to the position in Fig. 2b. c, d Measured PLDOS enhancements with near-field probing of y- and x-polarizations, Pyy/P0 and Pxx/P0, as a function of frequency and height. e, f Calculated Pyy/P0 and Pxx/P0 at positions (90 μm, 250 μm) and (180 μm, 210 μm), respectively, as a function of frequency and height. g Decay process of the PLDOS enhancement at the quasi-BIC frequency over h/λ0, for (i) y-polarization, and (ii) x-polarization, where h is the height above the surface of the metasurface and λ0 is the wavelength of the quasi-BIC mode. The calculated (lines) and measured (symbols) PLDOS enhancement are normalized by the maximum value.

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