naa a22 4500 510816401 CHVBK 20180411083509.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11468-013-9581-3 doi (NATIONALLICENCE)springer-10.1007/s11468-013-9581-3 Spectrally-Tunable Directionality of Compact Optical Nanoantennas [Elektronische Daten] [Hamed Nouri, Tavakol Pakizeh] We propose a novel design of plasmonic compact nanoantenna with an efficiently engineered spectral response for the directive emission or harvesting of light. The nanoantenna comprised of four gold nanodisks, arranged longitudinally, and appropriately spaced. Interestingly, by tuning of the inter-particle distances, it is found that the proposed nanoantenna shows either dual-band or broad-band unidirectional performances. These remarkable spectral effects are due to the tailored energies of the two hybridized out-of-phase LSPR modes and the intrinsic electromagnetic interactions. The theoretical predictions are obtained based on the modified coupled-dipole approximation method. In order to obtain more accurate theoretical results, the primary incident optical field seen by the smaller nanodisks are modified by taking into account the field-enhancement caused by the excited plasmons in the largest nanodisk when it is illuminated first. The theoretical results are confirmed by the electromagnetic simulations. Springer Science+Business Media New York, 2013 Optical Nanoantennas nationallicence Unidirectional nationallicence Plasmonics nationallicence Nano-optics nationallicence Nouri Hamed Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, 16314, Tehran, Iran aut Pakizeh Tavakol Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, 16314, Tehran, Iran aut Plasmonics Springer US; http://www.springer-ny.com 8/4(2013-12-01), 1633-1641 1557-1955 8:4<1633 2013 8 11468 https://doi.org/10.1007/s11468-013-9581-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-013-9581-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nouri Hamed Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, 16314, Tehran, Iran aut NATIONALLICENCE 700 1- Pakizeh Tavakol Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, 16314, Tehran, Iran aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/4(2013-12-01), 1633-1641 1557-1955 8:4<1633 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer