Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 166-171 |
| Number of pages | 6 |
| Journal | Nano Letters |
| Volume | 14 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 8 Jan 2014 |
| Externally published | Yes |
Keywords
- directivity
- electric quadrupole
- magnetic dipole
- Nanoantennas
- split-ring resonators