Fig. 4

Resonance oscillating effect by matching plasmonic resonances to second-harmonic wavelengths. (a ~ b) Experimental (a) and modeled (b) polarization-resolved SHG spectra together with corresponding reflectance spectra of Al nanorod arrays. The black solid lines are reflectance spectra, the blue and green curves are the SH spectra in p- and s-polarized light, respectively. Reprinted with permission from Nano Letters 2015, 15, 3917 − 3922. Copyright 2016 American Chemical Society. c-f Double resonant nanoantennas. The electric field distributions at the fundamental (c) and second-harmonic wavelength d. The scattering spectra (e) and SHG intensity (f) are compared between double resonant antenna (DRA) and dipole antenna (DA). Reprinted with permission from Optics express 2012, 20, 12,860–12865. Copyright 2012 Optical Society of American