Bow-Tie Aperture

An aperture in the shape of a bow tie, also called a bow-tie slot antenna is shown in Fig. 22. This aperture is essentially a rectangular aperture with a constriction in the center. When it is illuminated with light polarized across the gap as shown in the figure, a LSPR is excited which oscillates surface charge into the two tips in the center. The sharpened tips enhance the field strength in this region via the 

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In this section the results of the previous two sections are combined to compare several NFT designs that have been suggested for use in data storage. In particular, the triangle antenna and the bow-tie antenna are compared with the circular aperture, the tapered rectangular aperture, the bow-tie aperture, and the C aperture. All NFTs are illuminated by a highly focused beam using a SIL with a refractive index of 1.5 to obtain an optical spot size with dimensions... 

Near-Field Optics for Heat-Assisted Magnetic Recording BTC2 Bow tie aperture... 

Figure 23. Peak field intensity in the medium versus wavelength for a bow-tie aperture with dimensions given in the text.

Figure 24. Field intensity from the bow-tie aperture in the medium at a wavelength of 725 nm. (Reprinted from Ref. [7]. Copyright 2006 with permission from the Institute of Pure and Applied Physics.)...

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