Fig. 3: Experimental and theoretical analysis of the spectral response associated with LIET.
From: Plasmonic biosensor enabled by resonant quantum tunnelling
a,b, Electroluminescence spectra of the optimized metasurface for various applied voltages ranging from 1.5 V to 2.3 V as obtained from experimental measurements (a) and theoretical calculations (b). c, Calculated spectrum of emission intensity (blue curve) and its correlation to the experimental emission spectrum (green curve) at Vb = 2.3 V. Insets: the calculated optical electric field amplitude distribution in the x–z plane for p-polarized plane-wave excitation at two characteristic wavelengths under a certain incident polar angle θ: 650 nm (θ = 36°; red line) and 900 nm (θ = 54°; yellow line). d, Calculated normalized spectral electronic contribution H(ω) for Vb = 2.3 V. e, Calculated normalized spectral photonic contribution G(ω). f, Calculated angle-resolved EL intensity in k0 − k∣∣ space. The emission features corresponding to the dispersive plasmonic lattice mode and the dispersionless gap mode are marked with black lines. g, Calculated spectra of emission (solid lines) along a discrete set of angles corresponding to the dashed lines of matching colour in f.
