Polarization and angular insensitive perfect metasurface absorber in near-ultraviolet region

Optical perfect absorbers have attracted much attention due to their wide applications in areas including optical sensors, energy utilization, and photocatalysis. We present the design, characterization, and experimental demonstration of a narrowband, polarization- and angular-insensitive, high-performance plasmonic metasurface absorber in near-ultraviolet region. A measured absorption peak of 89% is achieved at the wavelength of ∼380 nm, though the calculated results give near-perfect absorption at the resonance wavelength. Our findings will promote more research on metasurface absorbers in near-ultraviolet region.