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28 March 2024 |
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Multi-slot Nanoantenna for Unidirectional Visible Radiation to Free-space | Jineun Kim
; Young-Geun Roh
; Sangmo Cheon
; Jong-Ho Choe
; Jongcheon Lee
; Jaesoong Lee
; Un Jeong Kim
; Yeonsang Park
; Chang-Won Lee
; In Yong Song
; Q-Han Park
; Sung Woo Hwang
; Kinam Kim
; | Date: |
7 Jan 2013 | Abstract: | Plasmonic nanoantennas are key elements in nanophotonics capable of directing
radiation or enhancing the transition rate of a quantum emitter. The
magnetic-dipole-type nanoantennas, which are the Babinet complementary
structures of typical electric-dipole-type, have received little attention
leaving their antenna properties largely unexplored. We present a multi-slot
nanoantenna with a magnetic dipole feed exhibiting highly unidirectional
free-space radiation. This antenna does not suffer from the directivity limit
arising from a natural tendency to radiate into high-refractive-index
substrates. Its geometry is engineered to achieve an optimal front-to-back
ratio by adjusting the phase of the plasmon field and couplings between slot
elements. We achieve a maximum front-to-back ratio of 8.5 (9.2 dB) with a
five-slot structure at 664 nm. A multi-slot nanoantenna provides a new
possibility of an electrically excitable feed and of energy transfer from one
waveguide to another by working as a future optical via. | Source: | arXiv, 1301.1075 | Services: | Forum | Review | PDF | Favorites |
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