Fig. 1. (a) Schematic diagram of Au grating/TiO2 spacer/Ag mirror structure; (b) schematic diagram of FSM structure; (c), (d) absorption spectrum under different light polarization conditions corresponding to the structures in (a), (b), respectively. The inset in (c) shows the magnetic field distribution under guided mode resonance conditions at λ=442nm.

Fig. 2. Absorption in the FSM structure as a function of wavelength and width of the lines in the fishnet for the different TiO2 thicknesses h of (a) 180 nm, (b) 200 nm, and (c) 220 nm, with t=10nm and P=200nm.

Fig. 3. (a) Three-dimensional schematic view of 70 nm width of the lines in the fishnet showing the cross-section along the x–z plane (red plane); (b) calculated electric field profiles in the x–z plane for a single unit cell at FPR2 λ=444nm, FPR1 λ=690nm, and at the LSPR λ=830nm; (c) time-averaged dissipative energy density Q in the x–z plane for a single unit cell at FPR2 λ=444nm, FPR1 λ=690nm, and at the LSPR λ=830nm.

Fig. 4. (a) Energy band diagram of the Au–TiO2–Ti–Ag Schottky diode; (b) absorption spectra at the top Au fishnet and Ag mirror of the various systems with TiO2 thicknesses h=180nm, 200 nm, and 220 nm; (c) responsivity and EQE of the device with TiO2 thicknesses h=180nm, 200 nm, and 220 nm. All of the responses are under zero bias, and all widths of the lines in the fishnet are kept at 70 nm.