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Proceedings Paper

Polarization controlled directional excitation of Bloch surface waves (Conference Presentation)

Paper Abstract

Bloch surface waves (BSWs) are electromagnetic surface waves which can be excited at the interface between periodic dielectric multilayer and a surrounding medium. In comparison with surface plasmon polaritons these surface states perform high quality factor due to low loss characteristics of dielectric materials and can be exited both by TE and TM polarized light. A platform consisting of periodic stacks of alternative SiO2 and Si3N4 layers is designed and fabricated to work at the wavelength of 1.55 µm. The platform has an application in sensing and in integrated optics domain. A standard way of BSW excitation is coupling via Kretschmann configuration, but in this work we investigate a grating coupling of BSWs. Grating parameters are analytically and numerically optimized by RCWA and FDTD methods in order to obtain the best coupling conditions. The light is launched orthogonally to the surface of the photonic crystal and the grating. Due to a special grating configuration we demonstrate directionality of the BSW propagation depending on polarization of the incident light. The structure was experimentally realized on the surface of the photonic crystal by FIB milling. Experimental results are in a good agreement with a theory. The investigated configuration can be successfully used as a BSW launcher in on-chip all-optical integrated systems and work as a surface wave switch or modulator.

Paper Details

Date Published: 7 November 2016
PDF: 1 pages
Proc. SPIE 9919, Nanophotonic Materials XIII, 991907 (7 November 2016); doi: 10.1117/12.2248261
Show Author Affiliations
Tatiana Kovalevich, FEMTO-ST (France)
Philippe Boyer, FEMTO-ST (France)
Maria-Pilar Bernal, FEMTO-ST (France)
Myun-Sik Kim, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Hans Peter Herzig, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Thierry Grosjean, FEMTO-ST (France)

Published in SPIE Proceedings Vol. 9919:
Nanophotonic Materials XIII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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