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Cross-sectional schematics of the metallic hole array samples on GaAs and ErAs:GaAs substrates. The substrates in the hole areas, labeled “Photo-conductive layer,” become conductive under illumination.
(a) Terahertz transmission spectra through hole array on GaAs. (b) Comparison of the terahertz transmission at 0.8 THz (SPP resonance) through the blank GaAs slab and the hole array on GaAs as a function of the pump fluence: Solid circles represent the measured data and the lines are the biexponential decay fittings. Inset shows the flat transmission through the GaAs slab.
Resonant terahertz transmission spectra through a metallic hole array on an ErAs:GaAs superlattice substrate. Optical pump delay was carefully set to zero to obtain maximum modulation depth.
Pump delay dependent transmission spectra with an optical pump fluence of . The light blue line (gray in print) indicates zero delay.
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