Full text loading...
Schematic illustration of bow-tie aperture with bull’s eye structure. In the illustration, the number of concentric grooves is 3, but was used in the fabricated one.
Calculated transmission spectra for (a) bow-tie aperture without bull’s eye (BE) with different values of aperture diameter and for (b) bow-tie aperture and circular aperture with and without BE, with -diameter aperture. BE consists of six periodic concentric grooves wide and deep with periodicity on the resin substrate with a refractive index of 1.5 and is covered by a -thick gold film. Bow-tie aperture gap is . -polarized wave is incident from substrate side.
(a) Calculated time-averaged distribution in logarithmic scale for bow-tie aperture with bull’s eye in Fig. 2(b). -polarized Gaussian beam at is incident to the direction from bottom side (substrate side). (b) and (c) are distributions on the exit plane ( plane) at distance from aperture for the bow-tie aperture and the circular aperture with bull’s eye with -diameter aperture, respectively.
(a) Photograph of bow-tie aperture with bull’s eye, and (b) measured transmission spectra for bow-tie aperture with BE and circular aperture with BE (conventional bull’s eye).
(a) Schematic illustration of resolution test. (b) and (c) are the measured spatial resolution curves in the direction and direction, respectively.
THz-wave near-field image of -wide Cr pattern using bow-tie aperture with bull’s eye structure at wavelength of . The image consists of with a size.
Article metrics loading...