None sharp corner localized surface plasmons resonance based ultrathin metasurface single layer quarter wave plate

Abstract We report on a non-sharp-corner quarter wave plate (NCQW) within the single layer of only 8 nm thickness structured by Ag hollow elliptical ring array, where strong localized surface plasmons (LSP) resonances are excited. By manipulating parameters ring, transmitted amplitude and phase two orthogonal components well controlled. The difference π/2 ratio 1 is realized simultaneously at wavelength 834 with transmission 0.46. proposed NCQW also works in an ultrawide band 110 nm, which suggests efficient way exciting LSP designing plates, provides great potential for advanced nanophotonic devices integrated photonic systems.