Search

We experimentally controlled the spectral characteristics of the extraordinary transmissions observed in metal hole arrays by analogy with spoof surface plasmon-polaritons (spoof SPPs). We constructed doubly periodic metal hole arrays. The larger and smaller periodic holes are for inducing extraordinary transmissions and modifying the spoof SPPs' characteristics, respectively. Introducing the smaller holes that surround the larger hole arrays can modify the dispersion curve of the surface waves excited on a structured metal surface analogous to the spoof SPP model, and consequently, the extraordinary transmission peak will show a redshift. [ABSTRACT FROM AUTHOR]

Complex polariton dispersion relations were determined in the congruent lithium niobate crystal using the latest terahertz time domain spectroscopy. We measured the power and phase transmission spectra by the coherent THz radiation. The complex dispersion relations of phonon polariton frequency and damping have been investigated simply by rotating the polarization plane of an incident beam. These dispersive properties have been consistently reproduced by the damped harmonic oscillator model related to the lowest frequency infrared active modes. [ABSTRACT FROM AUTHOR]

This paper reports the first application of the terahertz time domain spectroscopy to phonon polariton dispersion. In order to determine polariton-dispersion of a high-quality ferroelectric bismuth titanate crystal plate, the phase delay was determined minutely as a function of THz radiation frequency in the region between 3 cm -1 and 100 cm -1 . The polarization dependence of polariton dispersion was clearly observed on the c-plate only by switching the polarization of an incident beam from E//a to E//b. The observed polariton dispersion relations are consistently explained by the calculation using Kurosawa's formula. [ABSTRACT FROM AUTHOR]