Optical antennas direct single-molecule emission
T. H. TAMINIAU, F. D. STEFANI, F. B. SEGERINK AND N. F. VAN HULST,
Volume: 2, 16 March 2008
Antennas have been used for more than a century to control emission and collection of radio and microwave radiation1. optical analogue is of great interest as it will allow unique control of absorption and emission2,3 at the nanometre scale4. Despite the intense recent research on optical antennas5–8, of the main functions of traditional antennas, the directing radiation, remains a challenge at optical frequencies. Here experimentally demonstrate control of the emission direction of individual molecules by reversible coupling to an optical monopole antenna. We show how the angular emission of coupled system is determined by the dominant antenna mode—that is, the antenna design—regardless of molecular orientation. This result reveals the role of the plasmon mode in the emission process and provides a clear guideline how exploit the large available library of radio antennas to direct emission in nano-optical microscopy9,10, spectroscopy11,12 light-emitting devices, including single-photon sources13–15.
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