Transmission of doughnut light through a bull's eye structure

摘要

We experimentally investigate the extraordinary optical transmission of doughnut light through a bull's eye structure. Since the intensity is vanished in the center of the beam, almost all the energy reaches the circular corrugations (not on the hole), and excites surface plasmons. which propagate through the hole and reradiate photons. The transmitted energy is about 32 times of the energy input on the hole area. It is also interesting that the transmitted light has a similar spatial shape with the input light even though the diameter of the hole is much smaller than the wavelength of light.