Fig. 4
Meta-optics for broad THz wave generation. a Left: SEM image of the metasurface consists of SRR array. Right: spectrum of the THz wave [99]. b Left: SEM image of the metasurface consists of two oppositely oriented SRR array. Right: spatiotemporal profile of the single cycle Hermite Gauss wavepacket [100]. c Top: schematic of THz wave generation from an ITO metafilm. Bottom: THz spectrum generated from ITO (red) and the noise spectrum (grey) [45]