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Sci Rep. 2014 Jun 25;4:5428. doi: 10.1038/srep05428.

Focusing and extraction of light mediated by Bloch surface waves.

Author information

1
1] Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino IT-10129, Italy [2] Nanofacility Piemonte, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino IT-10135, Italy.
2
Optics & Photonics Technology Laboratory, Ecole Polytechnique Fédérale de Lausanne, rue de la Maladière 71b, Neuchâtel CH-2002, Switzerland.
3
Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Str. 7, Jena DE-07745, Germany.
4
Nanofacility Piemonte, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino IT-10135, Italy.
5
Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino IT-10129, Italy.

Abstract

The control of emission from localized light sources is an objective of outstanding relevance in nanophotonics. In a recent past, a large number of metallic nanostructures has been proposed to this end, wherein plasmonic modes are exploited as energy carriers on a subwavelength scale. As an interesting alternative, we present here the use of surface modes on patterned dielectric multilayers to deliver electromagnetic power from free-space to localized volumes and vice versa. Thanks to this low-loss energy transfer, proper periodic ring structures are shown to provide a subwavelength focusing of an external radiation onto the multilayer surface. By reciprocity, the radiated power from emitters within the ring center is shown to be efficiently beamed in the free-space, with a well-controlled angular divergence. This mechanism overcomes some important limitations involved in the all-plasmonic approach, while opening new opportunities for hybrid devices in photon management applications such as optical sensing and lighting.

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