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The enhanced light transmission through an array of subwavelength holessurrounded by Bragg mirrors is studied, showing that the mirrors act to confinethe surface plasmons associated with the Extraordinary Optical Transmissioneffect, forming a surface resonant cavity. The overall effect is increasedlight transmission intensity by more than a factor of three beyond the alreadyenhanced transmission, independent of whether the Bragg mirrors are on theinput or the output side of the incident light. The geometry of the Braggmirror structures controls the enhancement, and can even reduce thetransmission in half. By varying these geometric parameters, we were able toperiodically modulate the transmission of light for specific wavelengths,consistent with the propagation and interference of surface plasmon waves in aresonant cavity. FDTD simulations and a wave propagation model verify thiseffect.

Periodic Modulation of Extraordinary Optical Transmission through Subwavelength Hole Arrays using Surrounding Bragg Mirrors