All-optical switching of localized surface plasmon resonance in single gold nanosandwich using GeSbTe film as an active medium

T. Hira, T. Homma, T. Uchiyama, K. Kuwamura, Y. Kihara, T. Saiki

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20 Citations (Scopus)

Abstract

Localized surface plasmon resonance (LSPR) switching was investigated in a Au/GeSbTe/Au nanosandwich as a key active element for plasmonic integrated circuits and devices. Near-infrared single-particle spectroscopy was conducted to examine the interaction of a Au nanorod (AuNR) and Au film, between which a GeSbTe layer was incorporated as an active phase-change media. Numerical calculation revealed that hybridized modes of the AuNR and Au film exhibit a significant change of scattering intensity with the phase change. In particular, the antisymmetric (magnetic resonance) mode can be modulated effectively by the extinction coefficient of GST, as well as its refractive index. Experimental demonstration of the switching operation was performed by alternate irradiation with a picosecond pulsed laser for amorphization and a continuous wave laser for crystallization. Repeatable modulation was obtained by monitoring the scattering light around the LSPR peak at λ = 1070 nm.

Original languageEnglish
Article number031105
JournalApplied Physics Letters
Volume106
Issue number3
DOIs
Publication statusPublished - 2015 Jan 19

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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