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We show that terahertz waves transmit through a lambda/30,000 nanogap separating two conducting planes. The field enhancement responsible for the light funneling has a 1/f dependence, which originates from the charging time of the gap.
By using terahertz (THz) time-domain spectroscopy we measured THz-electromagnetic pulse passing through a two-by -two subwavelength hole matrix in near-field regime. Our Fourier analysis of measured data shows detection position dependent transmission maxima with respect to the polarization direction of the incident field. By comparing with numerical simulations based on finite element method, we...
We experimentally study Poynting vector flows when terahertz waves transmit through a multiple slit arrays. Our methods provide a new way of visualizing energy flows and determining different diffraction orders in the near-field.
We have achieved the nearly perfect transmission over 90% of random arrays that can be thought of as merely collective system of single rectangular holes with various length-to-width ratios and slits, using terahertz time domain spectroscopy. It is found that the terahertz transparency by the enhanced transmission can be experimentally realized even in the areal coverage less than 12% at the fundamental...
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