Journal
NANO LETTERS
Volume 14, Issue 1, Pages 166-171Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403681g
Keywords
Nanoantennas; split-ring resonators; directivity; electric quadrupole; magnetic dipole
Categories
Funding
- European Research Council [247330]
- forgone Spanish Ministry of Science and Innovation (MICINN) [CSD2007-046-NanoLight.es, FIS2009-08203]
- Ministry of Education through FPU
- Fundacio CELLEX Barcelona
- ICREA Funding Source: Custom
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By directing light, optical antennas can enhance light-matter interaction and improve the efficiency of nanophotonic devices. Here we exploit the interference among the electric dipole, quadrupole, and magnetic dipole moments of a split-ring resonator to experimentally realize a compact directional optical antenna. This single-element antenna design robustly directs emission even when covered with nanometric emitters at random positions, outperforming previously demonstrated nanoantennas with a bandwidth of 200 nm and a directivity of 10.1 dB from a subwavelength structure. The advantages of this approach bring directional optical antennas closer to practical applications.
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