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(a) A cross-sectional view of the sample. (b) An optical microscope image of the typical sample (top view). The inset shows a blowup of the PhC electrode pattern. Here, and denote the lattice constant and the air hole radius, respectively.
Time domain THz traces measured at ; (a) sample without PhC electrode (reference sample R) and (b) sample with a PhC electrode (S2, ). Fourier spectra of the emitted THz waveforms measured at various for R (c) and S2 (d). denotes the expected midgap frequency.
Fourier spectra of the THz emission (a) and the corresponding extinction ratio (b) measured at for the samples with various Ti thicknesses (, 10, 20, and 40 nm).
The THz electric field distribution (-component) in the unit cell of the PhC calculated at the midgap frequency (1.7 THz) for S1 [; (a)] and S4 [; (b)], respectively.
Measured sheet resistivities of the Ti layers. The sheet resistivity of PhC electrode (700 nm thick Au) is .
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