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Fabrication of cost-effective, highly reproducible large area arrays of nanotriangular pillars for surface enhanced Raman scattering substrates

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Nano Research 2016年第10期9卷 3075-3083页

作者： Kudilatt Hasna Aldrin Antony joaquim puigdollers Kumaran Rajeev Kumar Madambi Kunjukuttan Jayaraj Nanophotonic & Optoelectronic Devices Laboratory Department of Physics Cochin University of Science & Technology Kochi 682 022 India Department of Instrumentation Cochin University of Science & Technology Kochi 682 022 India Department of Energy Science and Engineering Indian Institute of Technology Bombay Maharashtra 400 076 India Department of Enginyeria Electronica Universitat Politecnica Catalunya C/Jordi Girona 31 Modul C4 Barcelona 08034 Spain

Development of cost-effective, highly reproducible non-conventional fabrication techniques for anisotropic metal nanostructures is essential to realizing potential applications of plasmonic devices, photonic devices, and surface enhanced Raman scattering （SERS） phenomenon based sensors. This report highlights the fabrication of nanotriangle arrays via nanoimprinting to overcome difficulties in creating large-area SERS active substrates with uniform, reproducible Raman signals. Electron beam lithography of anisotropic nanostructures, formation of arrays of nanotriangles in silicon and the transfer of triangular shapes to polymethylmethacrylate （PMMA） sheets via nanoimprinting have not been reported elsewhere. The reuse of silicon masters offers potential for production of low cost SERS substrates. The SERS activity and reproducibility of nanotriangles are illustrated and a consistent average enhancement factor of up to -2.9 × 1011, which is the highest value reported for a patterned SERS substrate, is achieved.

关键词： metal nanostructures localized surface plasmon resonance (LSPR) surface enhanced Ramanscattering (SERS) substrate enhancement factor

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Intermittent chaos for ergodic light trapping in a photonic fiber plate

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Light(Science & Applications) 2016年第1期5卷 209-215页

作者： Marina Mariano Gregory Kozyreff Luis G Gerling Pablo Romero-Gomez joaquim puigdollers Jorge Bravo-Abad Jordi Martorell ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)08860Spain Département de Physique UniversitéLibre de Bruxelles(ULB)Campus de la PlaineBruxelles B-1050Belgium Departament Enginyeria Electrònica Universitat Politècnica de CatalunyaBarcelona 08034Spain Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center(IFIMAC) Universidad Autónoma de MadridMadrid 28049Spain Departament de Física Universitat Politècnica de CatalunyaTerrassa 08222Spain

Extracting the light trapped in a waveguide,or the opposite effect of trapping light in a thin region and guiding it perpendicular to its incident propagation direction,is essential for optimal energetic performance in illumination,display or light harvesting *** we demonstrate that the paradoxical goal of letting as much light in or out while maintaining the wave effectively trapped can be achieved with a periodic array of interpenetrated fibers forming a photonic fiber *** entering perpendicular to that plate may be trapped in an intermittent chaotic trajectory,leading to an optically ergodic *** fabricated such a photonic fiber plate and showed that for a solar cell incorporated on one of the plate surfaces,light absorption is greatly *** this,we found the unexpected result that a more chaotic photon trajectory reduces the production of photon scattering entropy.

关键词： chaos ergodicity fiber light-guiding plate light harvesting light trapping

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