Electrooptic Modulation in Thin Film Barium Titanate Plasmonic Interferometers

We demonstrate control of the surface plasmon polariton wavevector in an active metal−dielectric plasmonic interferometer by utilizing electrooptic barium titanate as the dielectric layer. Arrays of subwavelength interferometers were fabricated from pairs of parallel slits milled in silver on barium...

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Veröffentlicht in:	Nano letters 2008-11, Vol.8 (11), p.4048-4052
Hauptverfasser:	Dicken, Matthew J, Sweatlock, Luke A, Pacifici, Domenico, Lezec, Henri J, Bhattacharya, Kaushik, Atwater, Harry A
Format:	Artikel
Sprache:	eng
Schlagworte:	Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) Condensed matter: electronic structure, electrical, magnetic, and optical properties Dielectric thin films Dielectrics, piezoelectrics, and ferroelectrics and their properties Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Exact sciences and technology Physics Surface and interface electron states
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Beschreibung
Zusammenfassung:	We demonstrate control of the surface plasmon polariton wavevector in an active metal−dielectric plasmonic interferometer by utilizing electrooptic barium titanate as the dielectric layer. Arrays of subwavelength interferometers were fabricated from pairs of parallel slits milled in silver on barium titanate thin films. Plasmon-mediated transmission of incident light through the subwavelength slits is modulated by an external voltage applied across the barium titanate thin film. Transmitted light modulation is ascribed to two effects, electrically induced domain switching and electrooptic modulation of the barium titanate index.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl802981q