Optical Absorption and Emission of Nanomaterials Integrated in One Dimensional Photonic Crystals

Department of Physics of Condensed Matter/University of Seville Institute of Materials Science of SevilleTese arquivada ao abrigo da Portaria nº227/2017 de 25 de julho

Molding with nanoparticle-based one-dimensional photonic crystals: A route to flexible and transferable Bragg mirrors of high dielectric contrast

Self-standing, flexible Bragg mirror films of high refractive index contrast and showing intense and wide Bragg peaks are herein presented. Nanoparticle-based one-dimensional photonic crystals are used as templates to infiltrate a polymer, which provides the multilayer with mechanical stability while preserving the dielectric contrast existing in the mold. Such films can be lifted off the substrate and used to coat another surface of arbitrary shapeMinisterio de Ciencia y Educación MAT2008-02166Junta de Andalucía FQM-357

Angular emission properties of a layer of rare-earth based nanophosphors embedded in one-dimensional photonic crystal coatings

The angular properties of light emitted from rare-earth based nanophosphors embedded in optical resonators built in one-dimensional photonic crystal coatings are herein investigated. Strong directional dependence of the photoluminescence spectra is found. Abrupt angular variations of the enhancement caused by the photonic structure and the extraction power are observed, in good agreement with calculated polar emission patterns. Our results confirm that the optical cavity favors the extraction of different wavelengths at different angles and that integration of nanophosphors within photonic crystals provides control over the directional emission properties that could be put into practice in phosphorescent displays.Ministerio de Ciencia e Innovación MAT2008- 02166, CSD2007-00007Junta de Andalucía FQM3579, FQM524

Environmentally responsive nanoparticle-based luminescent optical resonators

In this work, we demonstrate that optical resonators built using all-nanoparticle-based porous building blocks provide a responsive multifunctional matrix, totally different emission spectra being attained from the same embedded luminescent nanophosphors under varying environmental conditions. We show a clear correlation between modifications in the ambient surroundings, the induced changes of the resonant modes, and the resulting variations in the emission response. The method is versatile and allows nanophosphors of arbitrary shape to be integrated in the cavity. By precise control of the spectral features of the optical resonances, luminescence is strongly modulated in selected and tuneable wavelength ranges. Applications in the fields of sensing and detection are foreseen for these materialsEspaña Ministerio de Ciencia e Innovación MAT2008-02166 CONSOLIDER HOPE CSD2007-00007Junta de Andalucía FQM357

Molding with nanoparticle-based one-dimensional photonic crystals: A route to flexible and transferable Bragg mirrors of high dielectric contrast

Self-standing, flexible Bragg mirror films of high refractive index contrast and showing intense and wide Bragg peaks are herein presented. Nanoparticle-based one-dimensional photonic crystals are used as templates to infiltrate a polymer, which provides the multilayer with mechanical stability while preserving the dielectric contrast existing in the mold. Such films can be lifted off the substrate and used to coat another surface of arbitrary shape. © The Royal Society of Chemistry 2009.Peer Reviewe

Versatility and multifunctionality of highly reflecting Bragg mirrors based on nanoparticle multilayers

The use of both supported and flexible self-standing nanoparticle-based one dimensional photonic crystal films as effective frequency selective filters in the UV-vis-NIR is herein evaluated. The requirements to achieve a flat spectral response at the desired frequency range are analyzed and a synthetic route to realize materials with such properties presented. Strict control over the structural parameters yields multilayers in which the opening or closing of higher order photonic band gaps can be devised, thus leading to films capable of blocking the UV and NIR ranges simultaneously. Furthermore, the physico-chemical properties of the mirror can be modified to yield either moisture-repelling or, on the contrary, environmentally responsive optical filters. These materials present a great potential to be used as versatile and multifunctional optical elements. © 2010 The Royal Society of Chemistry.We thank the Spanish Ministry of Science and Innovation for funding provided under grants MAT2008-02166 and CONSOLIDER HOPE CSD2007-00007, as well as Junta de Andalucía for grant FQM3579 and FQM5247. The methods and materials herein presented are protected under patent ES P200900275.Peer Reviewe

Interplay of resonant cavity modes with localized surface plasmons: Optical absorption properties of bragg stacks integrating gold nanoparticles

A procedure to prepare porous photonic crystal resonators containing gold nanoparticles is reported. The optical absorption of the ensemble, resulting from the excitation of the localized surface plasmon of the metallic beads, is finely tuned by a gradual shift of the cavity mode. This is achieved by infiltration of the void network with different guest compounds. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.The authors thank the Spanish Ministry of Science and Innovation for funding provided under grants MAT2008–02166 and CONSOLIDER HOPE CSD2007–00007 and Junta de Andalucía for grants FQM3579 and FQM5247. M.E.C. thanks the Junta de Andalucía for funding of his contract. L.M.L.-M. acknowledges fi nancial support from MiCInn/FEDER (MAT2010–15374) and Xunta de Galicia (09TMT011314PR).Peer Reviewe

Control over the Structural and Optical Features of Nanoparticle-Based One-Dimensional Photonic Crystals

Herein we present a detailed analysis of the effect of the spin-coating protocol over the optical properties of nanoparticle-based one-dimensional photonic crystals. Based on these results, we provide a reliable synthetic route to attain high-quality porous multilayers in which the effect of imperfections is minimized and whose Bragg diffraction can be precisely tuned over the entire visible and near-infrared spectrum. We present a systematic study of the effect of the acceleration ramp and final rotation speed over the structural and optical quality of these materials. This allows us to relate the structural variations observed with the different relative importance of fluid flow and solvent evaporation on the thinning of each layer in the stack for the different deposition conditions employedPeer reviewe

Angular emission properties of a layer of rare-earth based nanophosphors embedded in one-dimensional photonic crystal coatings

The angular properties of light emitted from rare-earth based nanophosphors embedded in optical resonators built in one-dimensional photonic crystal coatings are herein investigated. Strong directional dependence of the photoluminescence spectra is found. Abrupt angular variations of the enhancement caused by the photonic structure and the extraction power are observed, in good agreement with calculated polar emission patterns. Our results confirm that the optical cavity favors the extraction of different wavelengths at different angles and that integration of nanophosphors within photonic crystals provides control over the directional emission properties that could be put into practice in phosphorescent displays. © 2011 American Institute of Physics.We acknowledge the Spanish Ministry of Science and Innovation for funding provided under grants MAT2008-02166 and CONSOLIDER HOPE CSD2007-00007, to Junta de Andalucía for grants FQM3579 and FQM5247. M.E.C. acknowledges the Junta de Andalucía for funding of his contract. These results are within the scope of C’Nano IdF and were partially supported by the Région Ile-de-France. C’Nano IdF is a CNRS, CEA, MESR, and Région Ile-de-France Nanosciences Competence Center.Peer Reviewe