Fig. 1: The schematic of dielectric metalenses for at-will dispersion engineering in an ultra-broad bandwidth. | Nature Communications

Fig. 1: The schematic of dielectric metalenses for at-will dispersion engineering in an ultra-broad bandwidth.

From: Asymptotic dispersion engineering for ultra-broadband meta-optics

Fig. 1

a The schematic wavefronts of two different compensation methods: linear phase compensation and asymptotic phase compensation, for arbitrary dispersion manipulation. The left and the right embedded figure are the phase profiles of different wavelengths of the two methods, respectively. The wavelength decreases from gray to blue. b The comparison between the intrinsic phase dispersion of the meta-unit and constructed phase dispersion of linear phase compensation method in two narrow bands. c The comparison between the intrinsic phase dispersion of the meta-unit and constructed phase dispersion of asymptotic phase compensation method in the ultra-broadband range. d Scanning electron microscope image of the four types polarization-insensitive meta-units and the waveguide modes at two different wavelengths. e The relationship between the effective refractive index of four meta-units and the wavenumber.

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