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An optical antenna can convert a propagative optical radiation into alocalized excitation, and reciprocally. Although optical antennas can bereadily created using resonant nanoparticles (metallic or dielectric) aselementary building blocks, the realization of antennas sustaining multipleresonances over a broad range of frequencies remains a challenging task. Here,we use aluminum self-similar, fractal-like structures as broadband opticalantennas. Using electron energy loss spectroscopy, we experimentally evidencethat a single aluminum Cayley tree, a simple self-similar structure, sustainsmultiple plasmonic resonances. The spectral position of these resonances isscalable over a broad spectral range spanning two decades, from ultraviolet tomid-infrared. Such multi-resonant structures are highly desirable forapplications ranging from non-linear optics to light harvesting andphotodetection, as well as surface-enhanced infrared absorption spectroscopy.

Aluminum Cayley trees as scalable, broadband, multi-resonant optical antennas