We investigate the enhanced transmission of THz radiation through semiconductor gratings of subwavelength apertures. This enhanced transmission, being due to the tunnelling of surface plasmon polaritons, can be switched by modifying the temperature of the grating. We have measured the transmission of THz radiation through a grating of sub-wavelength apertures structured on a silicon wafer. A marked resonance for a wavelength fivefold larger than the size of the aperture is observed. This resonance is attributed to the excitation and tunneling of SPPs. The characteristics of SPPs are controlled by changing the carrier density, which can be done in semiconductors by varying the temperature.
Temperature switching of the extraordinary THz transmission through subwavelength apertures
2004-01-01
153791 byte
Conference paper
Electronic Resource
English
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