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SpringerOpen, Nanoscale Research Letters, 1(7), 2012

DOI: 10.1186/1556-276x-7-497

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Porous silicon microcavities: synthesis, characterization, and application to photonic barcode devices

Journal article published in 2012 by Fernando Ramiro-Manzano, Roberto Fenollosa ORCID, Elisabet Xifré-Pérez, Moises Garín ORCID, Francisco Meseguer
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

10.1186/1556-276X-7-497 ; We have recently developed a new type of porous silicon we name as porous silicon colloids. They consist of almost perfect spherical silicon nanoparticles with a very smooth surface, able to scatter (and also trap) light very efficiently in a large-span frequency range. Porous silicon colloids have unique properties because of the following: (a) they behave as optical microcavities with a high refractive index, and (b) the intrinsic photoluminescence (PL) emission is coupled to the optical modes of the microcavity resulting in a unique luminescence spectrum profile. The PL spectrum constitutes an optical fingerprint identifying each particle, with application for biosensing. In this paper, we review the synthesis of silicon colloids for developing porous nanoparticles. We also report on the optical properties with special emphasis in the PL emission of porous silicon microcavities. Finally, we present the photonic barcode concept.