Emergence of point defect states in a plasmonic crystal

Hikaru Saito, Hugo Lourenço-Martins, Noémie Bonnet, Xiaoyan Li, Tracy C. Lovejoy, Niklas Dellby, Odile Stéphan, Mathieu Kociak, Luiz Henrique Galvão Tizei

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

Plasmonic crystals are well known to have band structure including a band gap, enabling the control of surface plasmon propagation and confinement. The band dispersion relation of bulk crystals has been generally measured by momentum-resolved spectroscopy using far field optical techniques while the defects introduced in the crystals have separately been investigated by near field imaging techniques so far. Particularly, defect related energy levels introduced in the plasmonic band gap have not been observed experimentally. In order to investigate such a localized mode, we performed electron energy-loss spectroscopy (EELS) on a point defect introduced in a plasmonic crystal made up of flat cylinders protruding out of a metal film and arranged on a triangular lattice. The energy level of the defect mode was observed to lie within the full band-gap energy range. This was confirmed by a momentum-resolved EELS measurement of the band gap performed on the same plasmonic crystal. Furthermore, we experimentally and theoretically investigated the emergence of the defect states by starting with a corral of flat cylinders protrusions and adding sequentially additional shells of those in order to eventually form a plasmonic band-gap crystal encompassing a single point defect. It is demonstrated that a defectlike state already forms with a crystal made up of only two shells.

本文言語英語
論文番号245402
ジャーナルPhysical Review B
100
24
DOI
出版ステータス出版済み - 12 2 2019

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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