Temporal Spectroscopic Characteristics of Terahertz Pulses Transmitted through Metal Hole Arrays

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The temporal spectroscopic characteristics of the terahertz pulse transmitted through the metal hole array is investigated by using the THz time domain spectroscopy in combination with the short-time Fourier transformation. It is found that the THz wave at around the resonant frequency of the surface plasmon-polariton (SPP) delays compared with that at higher frequency region. From the dependence of the delay time on the thickness of the metal hole array and the frequency, the delay at the SPP resonant frequency is attributed to the deceleration of the group velocity of the THz wave in the metal hole.

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