Selective bright and dark mode excitation in coupled nanoantennas

Suyeon Lee, Yeonsang Park, Jineun Kim, Yeoung Geun Roh, Q Han Park

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Coupled nanoantennas as metamaterial unit elements possess peculiar spectral and radiational behaviors. We show that nanoantennas made of two identical plasmonic slot resonators can greatly enhance the quality factors of resonance spectra and control radiation patterns through the selective excitation of bright and dark coupled modes. We confirm experimentally the enhanced quality factor of a bright mode in coupled nanoantennas. Adding phase modulators to the coupled microwave antennas, we demonstrate the “dark mode only” excitation of coupled microwave antennas with an incident plane wave. We also show that the bright-to-dark mode conversion and the related changes in radiation patterns can be controlled by the polarization of incident waves. In particular, we achieve leftward or rightward unidirectional radiation upon the injection of left or right circularly polarized waves.

Original languageEnglish
Pages (from-to)21537-21545
Number of pages9
JournalOptics Express
Volume26
Issue number17
DOIs
Publication statusPublished - 2018 Aug 20

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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