Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 4, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2116833119
Keywords
plasmonics; nanoantennas; fractal; aluminum
Categories
Funding
- Region Grand Est
- Graduate School NANO-PHOT Grant [ANR-18-EURE-0013]
- National Agency for Research [QUENOT ANR-20-CE30-0033, TEMPOS-CHROMATEM ANR-10-EQPX-50]
- European Union [823717, 101017720]
- CNRS-CEA METSA French Network Grant FR CNRS 3507 on the platform LPS-STEM
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This article introduces the use of aluminum self-similar structures as broadband optical antennas and experimentally demonstrates that these structures can support multiple resonances that can be scaled over a broad spectral range. Such multiresonant structures are highly valuable for applications in nonlinear optics, light harvesting and photodetection, as well as surface-enhanced infrared absorption spectroscopy.
An optical antenna can convert a propagative optical radiation into a localized excitation and the reciprocal. Although optical antennas can be readily created using resonant nanoparticles (metallic or dielectric) as elementary building blocks, the realization of antennas sustaining multiple resonances over a broad range of frequencies remains a challenging task. Here, we use aluminum self-similar, fractal-like structures as broadband optical antennas. Using electron energy loss spectroscopy, we experimentally evidence that a single aluminum Cayley tree, a simple self-similar structure, sustains multiple plasmonic resonances. The spectral position of these resonances is scalable over a broad spectral range spanning two decades, from ultraviolet to midinfrared. Such multiresonant structures are highly desirable for applications ranging from nonlinear optics to light harvesting and photodetection, as well as surface-enhanced infrared absorption spectroscopy.
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