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We report huge field accumulations in rectangular aperture arrays on thin metal film by using shape resonance in THz frequency region. A large far-field transmittance enhancement is observed in the samples of various widths ranging from 10 mum to 1.8 mum which corresponds to only an order of lambda/100. Theoretical calculations based on vector diffraction theory indicates 230 times field enhancement...
We report on the terahertz modulation based on the micro- and nano- sized apertures with metal-insulator phase transition of VO2 thin film. Terahertz wave transmission through subwavelength apertures is controlled by temperature driven refractive index change of VO2 substrate.
We measure field enhancement through nanogap by using both terahertz time domain spectroscopy (TDS) and terahertz imaging technique with continuous wave (CW) radiation source. Far-field amplitude is connected to the near-field enhancement through the Kirchhoff formalism. With TDS, we found that a field enhancement of 200 at 0.1 THz for the 500 nm slit. To confirm our TDS results, we also perform the...
Optical responses of metal nano-aperture probes for the electric and the magnetic field polarization are investigated with radially and azimuthally polarized lights.
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 present results on THz near-field measurements of sub-wavelength single holes made in metal. Time and frequency dependence of the electric near-field of single sub-wavelength apertures are compared with the near-field predictions made by the well-known Bethe-Bouwkamp model.
An array of sub-wavelength circular apertures (d=60 mum), periodically distributed in a square lattice, was studied in the near field using Terahertz Time-Domain Spectroscopy (THz-TDS). Images of the complete electric field distribution (Emacrx,Emacry,Emacrz) were recorded over a subsection of the array, as well as the corresponding spectral information, with a spatial resolution Lt10 mum.
We investigate surface wave generation by a single slit, both in nano-optical and in terahertz regimes. The wave-front in optical regime separates itself into forward propagating wave and surface-bound 90-degree diffracted wave; while, no such clear separation of modes is not observed in terahertz regime. Excitation wavelength dependency is systematically studied.
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