Multiwavelength polarization-insensitive lenses based on dielectric metasurfaces with meta-molecules

作者：Arbabi, Ehsan; Arbabi, Amir; Kamali, Seyedeh Mahsa; Horie, Yu; Faraon, Andrei^*

来源：Optica, 2016, 3(6): 628-633.

DOI：10.1364/OPTICA.3.000628

• BINARY DIFFRACTIVE ELEMENTS
• HOLOGRAM OPTICAL-ELEMENTS
• HIGH-TRANSMISSION
• EFFICIENCY
• PHASE
• WAVELENGTHS
• ABERRATIONS
• APERTURES
• SYSTEMS
• DESIGN

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.

• 出版日期2016-6-20