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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...
We have measured transmission properties of a composite structure consisting of nano-rods on a long (ay = 300 micron) nano gap (70 nm) on Au film in broad frequency range of 0.1 THz to 1.0 THz using THz time-domain spectroscopy. The normalized transmittance with no nano-bridge or nano-rod structure in the middle shows a half-wavelength resonance: the resonance frequency is ~c/(2nay) where n is the...
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.
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.
Polarization resolved detection of the scattered light by a gold nano-particle functionalized tip, off a propagating surface plasmon polariton wave enables quantitative studies of the image dipole orientation effects on flat metal surface.
We report on the vector mapping of optical standing waves with gold nanoparticle-functionalized tips. We can map the long- and short-axes of general elliptical polarization by performing the polarization-analyzed detection of the scattered light. The local field vectors are successfully read out independent of the tips with different scattering tensors.
We report on experimental vector mapping of optical standing waves generated in prism surface. The polarization characteristics of photons scattered by gold nanoparticle-functionalized tips are used to determine the orientation of a local electric field.
We mapped the nano-scale elliptical polarizations of an evanescent standing wave by polarization-analysis, and also by ellipsometric analysis of the scattered light off gold-nanoparticle functionalized tips. Both methods give consistent measurements of the local fields.
We report on a drastic near-to-far field spectral evolution in the transmission spectra of metallic nanoslit arrays. The far-field spectral minimum is located exactly at the near-field spectral maximum, confirming an equipartition of diffraction orders.
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