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Metacoatings for wavelength scale, high NA plano-concave focusing lenses
- Source :
- J. Opt. Soc. Am. B 33, 2120-2128 (2016)
- Publication Year :
- 2016
-
Abstract
- We design plano-concave silicon lenses with coupled gradient-index plasmonic metacoatings for ultrawide apertured focusing utilizing a reduced region of $\sim 20 \lambda^2$. The anomalous refraction induced in the planar input side of the lens and in the boundary of the wavelength-scale focal region boosts the curvature of the emerging wavefront, thus significantly enhancing the resolution of the tightly-focused optical wave. The formation of a light tongue with dimensions approaching those of the concave opening is here evidenced. This scheme is expected to have potential applications in optical trapping and detection.
- Subjects :
- Physics - Optics
Subjects
Details
- Database :
- arXiv
- Journal :
- J. Opt. Soc. Am. B 33, 2120-2128 (2016)
- Publication Type :
- Report
- Accession number :
- edsarx.1606.01499
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1364/JOSAB.33.002120