Journal
OPTICS LETTERS
Volume 36, Issue 4, Pages 451-453Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.000451
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Funding
- United States Army Research Office (USARO) [50342-PH-MUR, W911NF-09-1-0539]
- National Science Foundation (NSF) [DMR 0611430]
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We present comprehensive studies on thin diffraction lenses made of arrays of subwavelength, parallel nanoslits in a gold film. Such a nanoslit lens can operate either as a conventional convex or concave lens. The lenses can be designed to focus linearly polarized light with polarization either perpendicular (TM-lens) or parallel to the slits (TE-lens), while the orthogonal polarization diverges when passing through the lens. The designs of each lens are initially built on the dispersion relations for wave propagation through a parallel-plate waveguide. Both TM- and TE-lenses were realized experimentally, and full-wave numerical simulations fully support the experimental results. (C) 2011 Optical Society of America
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