Three-dimensional study of planar optical antennas made of split-ring architecture outperforming dipole antennas for increased field localization
Date
2012-01-09
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Source Title
Optics Letters
Print ISSN
0146-9592
Electronic ISSN
Publisher
Optical Society of America
Volume
37
Issue
2
Pages
139 - 141
Language
English
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Journal Title
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Abstract
Optical antennas are of fundamental importance for the strongly localizing field beyond the diffraction limit. We report that planar optical antennas made of split-ring architecture are numerically found in three-dimensional simulations to outperform dipole antennas for the enhancement of localized field intensity inside their gap regions. The computational results (finite-difference time-domain) indicate that the resulting field localization, which is of the order of many thousandfold, in the case of the split-ring resonators is at least 2 times stronger than the one in the dipole antennas resonant at the same operating wavelength, while the two antenna types feature the same gap size and tip sharpness.