Fig. 3
a Current-voltage (IV) curves for the fabricated silicon PIN PDs under dark and light illumination (850 nm LED, 1.2 mW cm−2). b Comparison of the current response under 850 nm LED light illumination and c the wavelength-dependent photo responsivity in the devices with and without (control) MCAs’ decoration. The partial enlargement in shorter wavelength region (< 380 nm) was shown in the inset. d The corresponding enhancement ratio calculated from c, in which the on-resonance (Ron) and off-resonance (Roff) region referred to the reflection spectra marked as light red and light green in the background, respectively