Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Plasmon enhanced optical tweezers with gold-coated black silicon
Δημιουργός/Συγγραφέας:	Kotsifaki D.G. [EL] Κάνδυλα, Μαρία[EN] Kandyla, Maria Lagoudakis P.G.
Εκδότης:	Nature Publishing Group
Ημερομηνία:	2016
Γλώσσα:	Αγγλικά
ISSN:	2045-2322
DOI:	10.1038/srep26275
Περίληψη:	Plasmonic optical tweezers are a ubiquitous tool for the precise manipulation of nanoparticles and biomolecules at low photon flux, while femtosecond-laser optical tweezers can probe the nonlinear optical properties of the trapped species with applications in biological diagnostics. In order to adopt plasmonic optical tweezers in real-world applications, it is essential to develop large-scale fabrication processes without compromising the trapping efficiency. Here, we develop a novel platform for continuous wave (CW) and femtosecond plasmonic optical tweezers, based on gold-coated black silicon. In contrast with traditional lithographic methods, the fabrication method relies on simple, single-step, maskless tabletop laser processing of silicon in water that facilitates scalability. Gold-coated black silicon supports repeatable trapping efficiencies comparable to the highest ones reported to date. From a more fundamental aspect, a plasmon-mediated efficiency enhancement is a resonant effect, and therefore, dependent on the wavelength of the trapping beam. Surprisingly, a wavelength characterization of plasmon-enhanced trapping efficiencies has evaded the literature. Here, we exploit the repeatability of the recorded trapping efficiency, offered by the gold-coated black silicon platform, and perform a wavelength-dependent characterization of the trapping process, revealing the resonant character of the trapping efficiency maxima. Gold-coated black silicon is a promising platform for large-scale parallel trapping applications that will broaden the range of optical manipulation in nanoengineering, biology, and the study of collective biophotonic effects.
Τίτλος πηγής δημοσίευσης:	Scientific Reports
Τόμος/Κεφάλαιο:	6
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Gold, Green
Σημειώσεις:	Engineering and Physical Sciences Research Council, EPSRC: EP/M025330/1; General Secretariat for Research and Technology, GSRT: Polynano-Kripis 447963 Financial support of this work by the General Secretariat for Research and Technology, Greece, (project Polynano-Kripis 447963)
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο