Spatial Kramers–Kronig (KK) media are inhomogeneous materials enabling omnidirectional light absorption, but the successful experimental realizations are polarization-dependent, i.e., they absorb either transverse electric or transverse magnetic fields. Using a matryoshka metamaterial, the authors report the experimental realization of a polarization-independent omnidirectional absorber.
- Quanping Li
- Yu Luo
- Dexin Ye
