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URN: urn:nbn:de:swb:90-482698

Enhancing resonances of optical nanoantennas by circular gratings

Qi, J.; Kaiser, T.; Klein, A.E.; Steinert, M.; Pertsch, T.; Lederer, F.; Rockstuhl, C.

Optical plasmonic antennas allow for localizing and enhancing light at the nanoscale. To enhance the application opportunities of optical antennas, their quality factor needs to be substantially improved. Here, we numerically and experimentally demonstrate that the resonance of a dipolar metallic disc antenna can be enhanced by a circular grating that obeys the Bragg condition. The supporting grating effectively collects energy from an extended spatial domain and guides it spectrally-selected into the central antenna, leading to a significantly enhanced field intensity at resonance. Accordingly, the quality factor of the antenna is enhanced by at least five times. The approach can be applied to other plasmonic systems, hence constituting an important ingredient to a future plasmonic tool box.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen ID: 1000048269
HGF-Programm 43.23.01; LK 01
Erschienen in Optics express
Band 23
Heft 11
Seiten 14583-14595
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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