Fig. 1. Two different metasurface unit cells made of identical scattering particles arranged within (a) a square lattice and (b) a rectangular lattice.

Fig. 2. Cross-sectional view of a metasurface interacting with TE- and TM-polarized plane waves.

Fig. 3. (a) and (b) Metasurface unit cell composed of a T-shaped particle being illuminated by an obliquely incident plane wave. The metasurface lattice is a square.

Fig. 4. Representation of the symmetry-allowed multipolar components corresponding to the metasurface in Fig. 3.

Fig. 5. Two metasurfaces composed of (a) planar L-shaped structures and (b) vertical L-shaped structures. In both cases, the structures have arms of equal length.

Fig. 6. Symmetry-allowed material parameter tensors corresponding to the metasurface in (a) Fig. 5(a) and in (b) Fig. 5(b).

Fig. 7. Two metasurfaces composed of a periodic array of (a) square particles and (b) Gammadion particles.

Fig. 8. Symmetry-allowed material parameter tensors corresponding to the metasurface in (a) Fig. 7(a) and in (b) Fig. 7(b).

Fig. 9. Simulated spherical dipolar and quadrupolar components of an isolated gold Gammadion structure illuminated by an x-polarized z-propagating plane wave. The arms of the Gammadion structure have a cross section of 30nm×30nm, while the footprint of the structure is 150nm×150nm. The background medium is vacuum.