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Photonic crystals silk

Kyungtaek Min, Sookyoung Kim, Sunghwan Kim
Photonic crystals (PhCs) efficiently manipulate photons at the nanoscale. Applying these crystals to biological tissue that has been subjected to large deformation and humid environments can lead to fascinating bioapplications such as in vivo biosensors and artificial ocular prostheses. These applications require that these PhCs have mechanical durability, deformability, and biocompatibility. Herein, we introduce a deformable and conformal silk hydrogel inverse opal (SHIO); the photonic lattice of this 3D PhC can be deformed by mechanical strain...
June 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
Ali Mahdavi, George Sarau, Jolly Xavier, Taofiq K Paraïso, Silke Christiansen, Frank Vollmer
Photonic crystal modes can be tailored for increasing light matter interactions and light extraction efficiencies. These PhC properties have been explored for improving the device performance of LEDs, solar cells and precision biosensors. Tuning the extended band structure of 2D PhC provides a means for increasing light extraction throughout a planar device. This requires careful design and fabrication of PhC with a desirable mode structure overlapping with the spectral region of emission. We show a method for predicting and maximizing light extraction from 2D photonic crystal slabs, exemplified by maximizing silicon photoluminescence (PL)...
April 26, 2016: Scientific Reports
Sunghwan Kim, Alexander N Mitropoulos, Joshua D Spitzberg, David L Kaplan, Fiorenzo G Omenetto
We propose a biocompatible hybrid photonic platform incorporating a 3D silk inverse opal (SIO) crystal and a 2D plasmonic crystal formed on the top surface of the SIO. This hybrid photonic-plasmonic crystal (HPPC) structure simultaneously exhibits both an extraordinary transmission and a pseudo-photonic band-gap in its transmission spectrum. We demonstrate the use of the HPPC as a refractive index (RI) sensor. By performing a multispectral analysis to analyze the RI value, a sensitivity of 200,000 nm·Δ%T/RIU (refractive index unit) is achieved...
April 8, 2013: Optics Express
Jennifer MacLeod, Federico Rosei
No abstract text is available yet for this article.
February 2013: Nature Materials
Petru Ghenuche, Silke Rammler, Nicolas Y Joly, Michael Scharrer, Michael Frosz, Jérôme Wenger, Philip St J Russell, Hervé Rigneault
We demonstrate the use of a large-pitch Kagome-lattice hollow-core photonic crystal fiber probe for Raman spectroscopy. The large transmission bandwidth of the fiber enables both the excitation and Raman beams to be transmitted through the same fiber. As the excitation beam is mainly transmitted through air inside the hollow core, the silica luminescence background is reduced by over 2 orders of magnitude as compared to standard silica fiber probes, removing the need for fiber background subtraction.
November 1, 2012: Optics Letters
Silke L Diedenhofen, Olaf T A Janssen, Moïra Hocevar, Aurélie Pierret, Erik P A M Bakkers, H Paul Urbach, Jaime Gómez Rivas
We demonstrate experimentally the directional emission of light by InAsP segments embedded in InP nanowires. The nanowires are arranged in a periodic array, forming a 2D photonic crystal slab. The directionality of the emission is interpreted in terms of the preferential decay of the photoexcited nanowires and the InAsP segments into Bloch modes of the periodic structure. By simulating the emission of arrays of nanowires with the emitting segments located at different heights, we conclude that the position of this active region strongly influences the directionality and efficiency of the emission...
July 26, 2011: ACS Nano
Alberto Diaspro, Silke Krol, Omella Cavalleri, Daniela Silvano, Alessandra Gliozzi
Nanocapsules, fuzzy assemblies of polyelectrolyte, represent a comparatively new class of colloids with controlled nanostructure and tunable properties. Due to the fact that the core as well as the dissolution influences the wall texture and the properties of the hollow capsules, the use of carbonate crystals as template is most convenient. Yeast cells constitute as a core candidate as well. They are a good system for testing the protective ability of shells and the permeability of the walls with respect to the needs of biological systems, namely, feeding and stability against attacks...
September 2002: IEEE Transactions on Nanobioscience
Silke Leimkuhler, Rachael Hodson, Graham N George, K V Rajagopalan
Rhodobacter capsulatus xanthine dehydrogenase (XDH) forms an (alphabeta)2 heterotetramer and is highly homologous to homodimeric eukaryotic XDHs. The crystal structures of bovine XDH and R. capsulatus XDH showed that the two proteins have highly similar folds. We have developed an efficient system for the recombinant expression of R. capsulatus XDH in Escherichia coli. The recombinant protein shows spectral features and a range of substrate specificities similar to bovine milk xanthine oxidase. However, R. capsulatus XDH is at least 5 times more active than bovine XDH and, unlike mammalian XDH, does not undergo the conversion to the oxidase form...
June 6, 2003: Journal of Biological Chemistry
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