We experimentally investigate the extraordinary optical transmission ofdoughnut light through a bull's eye structure. Since the intensity is vanishedin the center of the beam, almost all the energy reaches the circularcorrugations (not on the hole), excite surface plasmons which propagate throughthe hole and reradiate photons. The transmitted energy is about 57 times of theinput energy on the hole area. It is also interesting that the transmittedlight has a similar spatial shape with the input light although the diameter ofthe hole is much smaller than the wavelength of light.
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