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Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture
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10.1063/1.2387984
/content/aip/journal/apl/89/20/10.1063/1.2387984
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/20/10.1063/1.2387984
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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).

Image of FIG. 5.
FIG. 5.

(a) Schematic illustration of resolution test. (b) and (c) are the measured spatial resolution curves in the direction and direction, respectively.

Image of FIG. 6.
FIG. 6.

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.

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/content/aip/journal/apl/89/20/10.1063/1.2387984
2006-11-17
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/20/10.1063/1.2387984
10.1063/1.2387984
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