期刊
OPTICA
卷 3, 期 6, 页码 628-633出版社
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.3.000628
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资金
- National Science Foundation (NSF) [1512266]
- Samsung
- Defense Advanced Research Projects Agency (DARPA)
- U.S. Department of Energy (DOE) [DE-SC0001293]
- U.S. Department of Energy (DOE) [DE-SC0001293] Funding Source: U.S. Department of Energy (DOE)
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1512266] Funding Source: National Science Foundation
Metasurfaces are nanostructured devices composed of arrays of subwavelength scatterers (or meta-atoms) that manipulate the wavefront, polarization, or intensity of light. Like most other diffractive optical devices, metasurfaces are designed to operate optimally at one wavelength. Here, we present a method for designing multiwavelength metasurfaces using unit cells with multiple meta-atoms, or meta-molecules. A transmissive lens that has the same focal distance at 1550 and 915 nm is demonstrated. The lens has a NA of 0.46 and measured focusing efficiencies of 65% and 22% at 1550 and 915 nm, respectively. With proper scaling, these devices can be used in applications where operation at distinct known wavelengths is required, like various fluorescence microscopy techniques. (C) 2016 Optical Society of America
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