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Optical Control over Surface-Plasmon-Polariton-Assisted THz Transmission through a Slit Aperture

2008; American Physical Society; Volume: 100; Issue: 12 Linguagem: Inglês

10.1103/physrevlett.100.123901

1092-0145

E. Hendry, F. J. García‐Vidal, L. Martı́n-Moreno, Jaime Gómez Rivas, Mischa Bonn, Alastair P. Hibbins, Matthew J. Lockyear,

Terahertz technology and applications

We demonstrate optical control over the transmission of terahertz (THz) radiation through a single subwavelength slit in an otherwise opaque silicon wafer. The addition of periodic corrugation on each side of the wafer allows coupling to surface plasmon polaritons, so that light not impinging directly on the slit can contribute to the transmission. A significant enhancement of the THz transmission can be achieved through control of the surface wave propagation length by excitation at optical wavelengths. The observed transmission increase is in distinct contrast to the reduction reported for photoexcitation of arrays of holes in semiconductors.