Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 2, Issue -, Pages -Publisher
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2013.28
Keywords
metalens; nano-antennas; plasmonics; wavefront shaping
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Funding
- Air Force Office of Scientific Research [FA9550-12-1-0024]
- U.S. Army Research Office [57981-PH]
- NSF [DMR-1120923]
- AFRL Materials and Manufacturing Directorate Applied Metamaterials Program with UES, Inc.
- Japan Society for the Promotion of Science Postdoctoral Fellowships for Research Abroad
- [W911NF-11-1-0359]
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We experimentally demonstrate the focusing of visible light with ultra-thin, planar metasurfaces made of concentrically perforated, 30-nm-thick gold films. The perforated nano-voids-Babinet-inverted (complementary) nano-antennas-create discrete phase shifts and form a desired wavefront of cross-polarized, scattered light. The signal-to-noise ratio in our complementary nano-antenna design is at least one order of magnitude higher than in previous metallic nano-antenna designs. We first study our proof-of-concept 'metalens' with extremely strong focusing ability: focusing at a distance of only 2.5 mu m is achieved experimentally with a 4-mu m-diameter lens for light at a wavelength of 676 nm. We then extend our work with one of these 'metalenses' and achieve a wavelength-controllable focal length. Optical characterization of the lens confirms that switching the incident wavelength from 676 to 476 nm changes the focal length from 7 to 10 mm, which opens up new opportunities for tuning and spatially separating light at different wavelengths within small, micrometer-scale areas. All the proposed designs can be embedded on-chip or at the end of an optical fiber. The designs also all work for two orthogonal, linear polarizations of incident light.
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