Figure 4.
Full investigation of the multifrequency antenna–VO2 hybrids shows resonant contribution in antenna-mediated IMT response. (a) Experimental and (b) calculated switching response ΔOD/ODAnt of antenna–VO2 hybrids for fixed Lv=210 nm and, bottom to top, varying Lh=160, 210, 260, 310 and 360 nm (calculated antennas are 20 nm shorter). Arrows indicate pump (magenta) and probe (black/red arrows, horizontal, green/blue arrows, vertical) polarizations. (c and d) Experimental (c) and calculated (d) resonance positions of the horizontal (top panel) antennas in multifrequency antenna arrays with combinations of Lh and Lv (see Supplementary Fig. S2 for helium-ion microscopy images). (e and f) Experimental (e) and calculated (f) normalized amplitude ΔOD/ODAnt for the horizontal readout (probe, black/red arrows) and for two pump polarizations, as indicated by magenta arrows. Crosses indicate arrays for which the resonance lies outside the spectral window of the probe.