Nanospectroscopy

ISSN: 2300-3537

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Nanospectroscopy is closed for submissions since May, 2019

Nanospectroscopy has been devoted to original and complete works on new methods or techniques to perform spectroscopy with a nanometric spatial resolution and to the investigation and discovery of new phenomena at the nanometer scale at the interface between physics, chemistry and biology. Nanospectroscopy additionally offered both theoretical and experimental new developments in the rapidly expanding field of nanosciences.

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Band 2 Heft 1

Januar 2016

Open Access 8. Juni 2016

Hybrid silica-gold core-shell nanoparticles for fluorescence enhancement

J. Grzelak, A. Krajewska, B. Krajnik, D. Jamiola, J. Choma, B. Jankiewicz, D. Piątkowski, P. Nyga, S. Mackowski

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Abstract

We demonstrate that SiO 2 nanoparticles coated with a gold island film (GIF) provide an efficient plasmonic platform for enhancing fluorescence intensity of chlorophyll-containing photosynthetic complexes. Fluorescence images obtained for single SiO 2 -Au coreshell nanoparticles mixed with photosynthetic complexes reveal very uniform emission patterns of a circular shape, similarly as observed for bare SiO 2 nanoparticles. The fluorescence enhancement of chlorophyll emission for SiO 2 -Au nanostructures is up to four-fold compared to bare SiO 2 nanoparticles and shortening of fluorescence decay indicates its plasmonic origin. For doublets or triplets of core-shell SiO 2 -Au nanoparticles, the intensity of emission is further increased as a result of hot-spot formation at the interfaces of such assemblies.

Open Access 28. Juni 2016

Simple modeling of the ratio of fields at a tip and at contacting surface

E. G. Bortchagovsky

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Abstract

The proposed concept of Raman probe for nearfield optical microscopy raises the question about the similarity of fields acting on specimens deposited at the tip apex and contacting surface. The signal generated at these two close but different points is defined by local fields, so it is the ratio of the fields at these points, that is the quantity of interest here. This work is concerned with the application of a simple dipole model for the analysis of the ratio of fields at the tip apex and at contacting surface as a function of their separation.

Open Access 23. Dezember 2016

Nonlinear emission from silver-coated 3D hollow nanopillars

L. Ghirardini, M. Malerba, M. Bollani, P. Biagioni, L. Duò, M. Finazzi, F. De Angelis, M. Celebrano

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Abstract

High aspect ratio metal nanostructures have been the subject of a number of studies in the past, due to their pronounced resonances in the infrared that can be exploited to enhance vibrational spectroscopies. In this work, we investigate the nonlinear optical response of both individual and closely-packed assemblies of vertical hollow Ag nanopillars upon excitation with ultrafast laser pulses. In particular, the analysis of their nonlinear emission spectra evidences an intense two photon photoluminescence (TPPL) emission and a neat signature of second harmonic generation (SHG). Given the relatively low background, this pronounced nonlinear emission could be employed as a local probe for analytes trapped at the surface of the nanopillar or flowing through it. For this reason, these nanostructures may become appealing building blocks in multi-purpose devices for nonlinear photonics and sensing.

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(English)

Typ: Zeitschrift
Sprache: Englisch
Verlag: De Gruyter Open Access
Erstveröffentlichung: 22. November 2014
Letzte Veröffentlichung: 8. Juni 2016
Erscheinungsweise: 1 Heft pro Jahr