Fig. 1. Design concept of transversely dispersive multi-foci metalens. (a) Metalens focusing green light to PG point; (b) metalens focusing blue light to PB point; (c) metalens focusing red light to PR point; (d) transversely dispersive multi-foci metalens focused on PG,PB,PR, respectively

Fig. 2. Design principle of transversely dispersive multi-foci metalens. (a) Geometric phase unit structure; (b) structure parameters of RectB, RectG, and RectR; (c) polarization conversion efficiencies of RectB, RectG and RectR in independent modulation versus wavelength of incident light; (d) phase modulation curves of RectB; phase distribution and random matrix under (e) blue, (f) green, and (g) red light incidence; (h) final phase distribution and matrix of transversely dispersive multi-foci metalens

Fig. 3. Focusing results of transversely dispersive multi-foci metalens. (a)(d)(g) Axial light field distributions of metalens with focus positions shown by white dotted lines; (b)(e)(h) foci of metalens; (c)(f)(i) one-dimensional horizontal transversals of metalens at focus position

Fig. 4. Crosstalk result of transversely dispersive multi-foci metalens in each wave band. Axial light field distributions of metalens at target focus and crosstalk focus under (a) blue, (e) green, and (i) red light incidence; (b)-(d) transverse light field distributions of metalens under blue light incidence; (f)-(h) transverse light field distribution of metalens under green light incidence; (j)-(l) transverse light field distribution of metalens under red light incidence