Improving near-field confinement of a bowtie aperture using surface plasmon polaritons
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 30, 2011
- Source ID
- 10.1063/1.3595412
Entities
People
- Okan K. Ersoy
- Pornsak Srisungsitthisunti
- Xianfan Xu
Organizations
- Air Force Office of Scientific Research
- Defense Advanced Research Projects Agency
- National Science Foundation
- Purdue University