On the Use of Plasmonic Nanoparticle Pairs As a Plasmon Ruler: The Dependence of the Near-Field Dipole Plasmon Coupling on Nanoparticle Size and Shape†

2009 ◽  
Vol 113 (10) ◽  
pp. 1946-1953 ◽  
Author(s):  
Christopher Tabor ◽  
Raghunath Murali ◽  
Mahmoud Mahmoud ◽  
Mostafa A. El-Sayed
Keyword(s):  
Near Field ◽  
Nanoparticle Size ◽  
Plasmon Coupling ◽  
Plasmonic Nanoparticle ◽  
Size And Shape ◽  
Plasmon Ruler

scholarly journals Effects of gap thickness and emitter location on the photoluminescence enhancement of monolayer MoS2 in a plasmonic nanoparticle-film coupled system

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 2097-2105
Author(s):  
Xiaozhuo Qi ◽  
Tsz Wing Lo ◽  
Di Liu ◽  
Lantian Feng ◽  
Yang Chen ◽  
...  
Keyword(s):  
Near Field ◽  
Central Area ◽  
Field Enhancement ◽  
Coupled System ◽  
Film Structure ◽  
Plasmonic Nanoparticle ◽  
Emitter Location ◽  
Radiation Properties ◽  
Radiation Enhancement ◽  
Quantum Emitters

AbstractPlasmonic nanocavities comprised of metal film-coupled nanoparticles have emerged as a versatile nanophotonic platform benefiting from their ultrasmall mode volume and large Purcell factors. In the weak-coupling regime, the particle-film gap thickness affects the photoluminescence (PL) of quantum emitters sandwiched therein. Here, we investigated the Purcell effect-enhanced PL of monolayer MoS2 inserted in the gap of a gold nanoparticle (AuNP)–alumina (Al2O3)–gold film (Au Film) structure. Under confocal illumination by a 532 nm CW laser, we observed a 7-fold PL peak intensity enhancement for the cavity-sandwiched MoS2 at an optimal Al2O3 thickness of 5 nm, corresponding to a local PL enhancement of ∼350 by normalizing the actual illumination area to the cavity’s effective near-field enhancement area. Full-wave simulations reveal a counterintuitive fact that radiation enhancement comes from the non-central area of the cavity rather than the cavity center. By scanning an electric dipole across the nanocavity, we obtained an average radiation enhancement factor of about 65 for an Al2O3 spacer thickness of 4 nm, agreeing well with the experimental thickness and indicating further PL enhancement optimization. Our results indicate the importance of configuration optimization, emitter location and excitation condition when using such plasmonic nanocavities to modulate the radiation properties of quantum emitters.

scholarly journals Influence of Nanoparticle Size and Shape on Oligomer Formation of an Amyloidogenic Peptide

2011 ◽  
Vol 2 (10) ◽  
pp. 1171-1177 ◽  
Author(s):  
Edward P. O’Brien ◽  
John. E. Straub ◽  
Bernard R. Brooks ◽  
D. Thirumalai
Keyword(s):  
Nanoparticle Size ◽  
Size And Shape ◽  
Oligomer Formation

scholarly journals Controlling the near-field excitation of nano-antennas with phase-change materials

2013 ◽  
Vol 4 ◽  
pp. 632-637 ◽  
Author(s):  
Tsung Sheng Kao ◽  
Yi Guo Chen ◽  
Ming Hui Hong
Keyword(s):  
Thin Layer ◽  
Phase Change ◽  
Hot Spots ◽  
Phase Change Materials ◽  
Near Field ◽  
Plasmon Coupling ◽  
New Approach ◽  
Field Excitation ◽  
Bio Assay ◽  
Nano Antennas

By utilizing the strongly induced plasmon coupling between discrete nano-antennas and quantitatively controlling the crystalline proportions of an underlying Ge2Sb2Te5 (GST) phase-change thin layer, we show that nanoscale light localizations in the immediate proximity of plasmonic nano-antennas can be spatially positioned. Isolated energy hot-spots at a subwavelength scale can be created and adjusted across the landscape of the plasmonic system at a step resolution of λ/20. These findings introduce a new approach for nano-circuitry, bio-assay addressing and imaging applications.

scholarly journals Preparation of polymer gold nanoparticle composites with tunable plasmon coupling and their application as SERS substrates

Nanoscale ◽  
2019 ◽  
Vol 11 (42) ◽  
pp. 19884-19894 ◽  
Author(s):  
Samir A. Belhout ◽  
Frederico R. Baptista ◽  
Stephen J. Devereux ◽  
Anthony W. Parker ◽  
Andrew D. Ward ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Optical Tweezer ◽  
Plasmon Coupling ◽  
Sers Substrates ◽  
Nanoparticle Composites ◽  
Composite Properties ◽  
Properties Of Composites ◽  
Plasmon Ruler

The plasmonic properties of composites with controlled AuNP loading are found to be well described by a plasmon ruler equation, and Raman optical tweezer results show the SERS performance in the bulk is dominated by the discrete composite properties.

scholarly journals Size and shape dependent few-cycle near-field dynamics of bowtie nanoantennas

2015 ◽  
Vol 23 (24) ◽  
pp. 31460 ◽  
Author(s):  
Eleonora Lorek ◽  
Erik Mårsell ◽  
Arthur Losquin ◽  
Miguel Miranda ◽  
Anne Harth ◽  
...  
Keyword(s):  
Near Field ◽  
Size And Shape

Gold nanoparticle size and shape influence on osteogenesis of mesenchymal stem cells

Nanoscale ◽  
2016 ◽  
Vol 8 (15) ◽  
pp. 7992-8007 ◽  
Author(s):  
Jingchao Li ◽  
Jia'En Jasmine Li ◽  
Jing Zhang ◽  
Xinlong Wang ◽  
Naoki Kawazoe ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Gold Nanoparticle ◽  
Nanoparticle Size ◽  
Size And Shape ◽  
Shape Influence

scholarly journals Gold Nanoparticle Size and Shape Effects on Cellular Uptake and Intracellular Distribution of siRNA Nanoconstructs

2017 ◽  
Vol 28 (6) ◽  
pp. 1791-1800 ◽  
Author(s):  
Jun Yue ◽  
Timothy Joel Feliciano ◽  
Wenlong Li ◽  
Andrew Lee ◽  
Teri W. Odom
Keyword(s):  
Gold Nanoparticle ◽  
Cellular Uptake ◽  
Intracellular Distribution ◽  
Nanoparticle Size ◽  
Size And Shape ◽  
Shape Effects
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