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Metacoatings for wavelength scale, high NA plano-concave focusing lenses

Authors :
Naserpour, Mahin
Zapata-Rodríguez, Carlos J.
Díaz-Aviñó, Carlos
Hashemi, Mahdieh
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

Subjects :
Physics - Optics

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