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Addressing the plasmonic hotspot region by site-specific functionalization of nanostructures

Goerlitzer, Eric S. A.; Speichermann, Lutz E.; Mirza, Talha A.; Mohammadi, Reza; Vogel, Nicolas

Abstract:
Strong electromagnetic fields emerge around resonant plasmonic nanostructures, focusing the light in tiny volumes, usually referred to as hotspots. These hotspots are the key regions governing plasmonic applications since they strongly enhance properties, signals or energies arising from the interaction with light. For a maximum efficiency, target molecules or objects would be exclusively placed within hotspot regions. Here, we propose a reliable, universal and high-throughput method for the site-specific functionalization of hotspot regions over macroscopic areas. We demonstrate the feasibility of the approach using crescent-shaped nanostructures, which can be fabricated using colloidal lithography. These structures feature polarization-dependent resonances and near-field enhancement at their tips, which we use as target regions for the site-selective functionalization. We modify the fabrication process and introduce a defined passivation layer covering the central parts of the gold nanocrescent, which, in turn, selectively uncovers the tips and thus enables a localized functionalization with thiol molecules. We demonstrate and visualize a successful targeting of the hotspot regions by binding small gold nanoparticles and show a targeting efficiency of 90%. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130131
Veröffentlicht am 26.02.2021
Originalveröffentlichung
DOI: 10.1039/c9na00757a
Scopus
Zitationen: 7
Web of Science
Zitationen: 4
Dimensions
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2516-0230
KITopen-ID: 1000130131
HGF-Programm 43.22.03 (POF III, LK 01) Printed Materials and Systems
Erschienen in Nanoscale advances
Verlag Royal Society of Chemistry (RSC)
Band 2
Heft 1
Seiten 394–400
Nachgewiesen in Dimensions
Web of Science
Scopus
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