期刊
ACS NANO
卷 10, 期 11, 页码 10275-10282出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b05855
关键词
metasurface; achromatic focusing; evolutionary algorithm; gold nanoparticles; flat lenses; predictive design
类别
资金
- Air Force Office of Scientific Research (AFOSR) [FA9550-14-1-0274]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
This paper describes an evolutionary approach to design flat multiwavelength achromatic lenses based on subwavelength plasmonic nanoparticles. Our lattice evolution algorithm achieved desired optical responses by tuning the arrangement of the phase units on a discrete square lattice. Lattice lenses consisting of a single type of nanoparticle could operate at any wavelength in the visible to near-infrared regime (540-1000 nm) by tailoring the localized surface plasmon resonance. When the unit cells were expanded to anisotropic particle shapes, the planar optics could selectively focus light depending on the polarization of incident light. Finally, the algorithm realized efficient multiobjective optimization and produced achromatic lattice lenses at up to three wavelengths lambda = 600 nm, lambda = 785 nm, and lambda = 980 nm) using multiple different nanoparticle shapes.
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