Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3595412
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Funding
- National Science Foundation [DMI-0707817]
- Defense Advanced Research Projects Agency [N66001-08-1-2037]
- AFOSR-Multidisciplinary University Research Initiative [FA9550-08-1-0379]
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Bowtie aperture is known to produce subdiffraction-limited optical spot with high intensity. In this work, we investigate integrating a bowtie aperture with circular grooves to reduce the divergence of the near-field produced by the bowtie aperture. Numerical results indicate that surface waves reflected from circular grooves improve the field confinement of a bowtie aperture along the polarization axis. These circular grooves with period near half the wavelength of surface plasmon polaritons reduce the spot size by as much as 40% at distances between 20 and 100 nm from the surface and create a more symmetrical optical spot. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3595412]
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