scholarly journals Designing an Efficient Self-Assembled Plasmonic Nanostructures from Spherical Shaped Nanoparticles

2021 ◽  
Author(s):  
Vasanthan Devaraj ◽  
Jong-Min Lee ◽  
Ye-ji Kim ◽  
Hyuk Jeong ◽  
Jin-Woo Oh
Keyword(s):  
Near Field ◽  
Simplified Model ◽  
Plasmonic Nanostructures ◽  
Dipole Mode ◽  
Plasmonic Nanoparticle ◽  
Mode Characteristics ◽  
Cluster A ◽  
Self Assembled ◽  
Nanoparticle Cluster ◽  
Gap Mode

We reveal the significance of plasmonic nanoparticle’s (NP) shape and its surface morphology en route to an efficient self-assembled plasmonic nanoparticle cluster. A simplified model is simulated in the form of free-space dimer and trimer nanostructures (NPs in shape of sphere, cube, and disk). A ~ 200 % to ~ 125% raise in near field strength (gap mode enhancement) is observed for spherical NPs in comparison with cubical NPs (from 2 nm to 8 nm gap sizes). Full-width three-quarter maximum reveals better broad-spectral optical performance in a range of ~ 100 nm (dimer) and ~ 170 nm (trimer) from spherical NPs as compared to a cube (~ 60 nm for dimer and trimer). These excellent properties for sphere-based nanostructures are merited from its dipole mode characteristics.

scholarly journals Engineering Efficient Self-Assembled Plasmonic Nanostructures by Configuring Metallic Nanoparticle’s Morphology

2021 ◽  
Vol 22 (19) ◽  
pp. 10595
Author(s):  
Vasanthan Devaraj ◽  
Jong-Min Lee ◽  
Ye-Ji Kim ◽  
Hyuk Jeong ◽  
Jin-Woo Oh
Keyword(s):  
Near Field ◽  
Simplified Model ◽  
Plasmonic Nanostructures ◽  
Dipole Mode ◽  
Plasmonic Nanoparticle ◽  
Mode Characteristics ◽  
Cluster A ◽  
Self Assembled ◽  
Nanoparticle Cluster ◽  
Gap Mode

We reveal the significance of plasmonic nanoparticle’s (NP) shape and its surface morphology en route to an efficient self-assembled plasmonic nanoparticle cluster. A simplified model is simulated in the form of free-space dimer and trimer nanostructures (NPs in the shape of a sphere, cube, and disk). A ~200% to ~125% rise in near-field strength (gap mode enhancement) is observed for spherical NPs in comparison with cubical NPs (from 2 nm to 8 nm gap sizes). Full-width three-quarter maximum reveals better broad-spectral optical performance in a range of ~100 nm (dimer) and ~170 nm (trimer) from spherical NPs as compared to a cube (~60 nm for dimer and trimer). These excellent properties for sphere-based nanostructures are merited from its dipole mode characteristics.

From macro to micro: multi-scale study of plasmonic nanocoating self-assembled on multijunction bulk solar cells

2020 ◽  
Author(s):  
Dan Su ◽  
Xiao-Yang Zhang ◽  
Lei Lv ◽  
Huan-Li Zhou ◽  
Shan-Jiang Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Near Field ◽  
Optical Microscope ◽  
Forward Scattering ◽  
Plasmonic Nanostructures ◽  
Plasmonic Enhancement ◽  
Strong Light ◽  
High Efficient ◽  
Self Assembled

Abstract Nanophotonics pours into new opportunities to achieve ultrahigh-efficiency solar cells, attracting tremendous interests from photovoltaic research and industry. Plasmonic nanostructures, enabling strong light-matter interaction at the nanoscale, have been widely used for efficiency enhancement in thin-film solar cell devices based on plasmonic near-field effects. Unlike thin-film device cases, we found forward scattering and inter-particle coupling engineering of subwavelength plasmonic nanostructures are the key to enhance the efficiency of bulk multijunction solar cells (MJSCs). As a proof of concept, we studied the plasmonic enhancement of Ag@SiO2 nanocoating self-assembled on InGaP/GaInAs/Ge MJSCs at both macro and micro scales. From the macro measurements, the experimental enhancement of Ag@SiO2 core-shell nanostructure could be well-matched with the simulational results, where strong forward scattering and suppressed interparticle coupling could be simultaneously achieved by employing ~ 22 nm SiO2 shell layer. Using a double excitation method under an infinity optical microscope, we directly observed multi-wavelength uniform photocurrent enhancements on MJSCs at a submicrometer scale. This study will provide an effective strategy and opening up new opportunities to explore high-efficient MJSCs using nanophotonics.

Processing and near-field optical properties of self-assembled plasmonic nanoparticle networks

2009 ◽  
Vol 130 (3) ◽  
pp. 034702 ◽  
Author(s):  
Frédéric Bonell ◽  
Audrey Sanchot ◽  
Erik Dujardin ◽  
Renaud Péchou ◽  
Christian Girard ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Field ◽  
Plasmonic Nanoparticle ◽  
Self Assembled

scholarly journals Distinguishable Plasmonic Nanoparticle and Gap Mode Properties in a Silver Nanoparticle on a Gold Film System Using Three-Dimensional FDTD Simulations

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 582 ◽  
Author(s):  
Vasanthan Devaraj ◽  
Jong-Min Lee ◽  
Jin-Woo Oh
Keyword(s):  
Layer Thickness ◽  
Silver Nanoparticle ◽  
Dielectric Layer ◽  
Gold Film ◽  
Computational Study ◽  
Near Field ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Plasmonic Nanoparticle ◽  
Gap Mode

We present a computational study of the near-field enhancement properties from a plasmonic nanomaterial based on a silver nanoparticle on a gold film. Our simulation studies show a clear distinguishability between nanoparticle mode and gap mode as a function of dielectric layer thickness. The observed nanoparticle mode is independent of dielectric layer thickness, and hence its related plasmonic properties can be investigated clearly by having a minimum of ~10-nm-thick dielectric layer on a metallic film. In case of the gap mode, the presence of minimal dielectric layer thickness is crucial (~≤4 nm), as deterioration starts rapidly thereafter. The proposed simple tunable gap-based particle on film design might open interesting studies in the field of plasmonics, extreme light confinement, sensing, and source enhancement of an emitter.

Nonlinear Amplification of Chirality in Self-Assembled Plasmonic Nanostructures

ACS Nano ◽  
2021 ◽  
Vol 15 (3) ◽  
pp. 5715-5724
Author(s):  
Mei Song ◽  
Lianming Tong ◽  
Shengli Liu ◽  
Yaowen Zhang ◽  
Junyu Dong ◽  
...  
Keyword(s):  
Plasmonic Nanostructures ◽  
Nonlinear Amplification ◽  
Self Assembled ◽  
Amplification Of Chirality

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.

Self-Assembled Plasmonic Nanoparticle Clusters

Science ◽  
2010 ◽  
Vol 328 (5982) ◽  
pp. 1135-1138 ◽  
Author(s):  
J. A. Fan ◽  
C. Wu ◽  
K. Bao ◽  
J. Bao ◽  
R. Bardhan ◽  
...  
Keyword(s):  
Plasmonic Nanoparticle ◽  
Nanoparticle Clusters ◽  
Self Assembled

scholarly journals Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography

2018 ◽  
Vol 9 ◽  
pp. 1536-1543 ◽  
Author(s):  
Gitanjali Kolhatkar ◽  
Alexandre Merlen ◽  
Jiawei Zhang ◽  
Chahinez Dab ◽  
Gregory Q Wallace ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Hot Spots ◽  
Near Field ◽  
Nanosphere Lithography ◽  
Plasmonic Nanostructures ◽  
Far Field ◽  
Optical Images ◽  
Spatial Frequencies ◽  
Comparison Of The Results ◽  
Non Destructive

We introduce a simple, fast, efficient and non-destructive method to study the optical near-field properties of plasmonic nanotriangles prepared by nanosphere lithography. Using a rectangular Fourier filter on the blurred signal together with filtering of the lower spatial frequencies to remove the far-field contribution, the pure near-field contributions of the optical images were extracted. We performed measurements using two excitation wavelengths (532.1 nm and 632.8 nm) and two different polarizations. After the processing of the optical images, the distribution of hot spots can be correlated with the topography of the structures, as indicated by the presence of brighter spots at the apexes of the nanostructures. This technique is validated by comparison of the results to numerical simulations, where agreement is obtained, thereby confirming the near-field nature of the images. Our approach does not require any advanced equipment and we suggest that it could be applied to any type of sample, while keeping the measurement times reasonably short.

Lateral Coupling of Self-Assembled Quantum Dots Studied by Near-Field Spectroscopy

1999 ◽  
Vol 571 ◽  
Author(s):  
H.D. Robinson ◽  
B.B. Goldberg ◽  
J.L. Merz
Keyword(s):  
Quantum Dots ◽  
Additional Data ◽  
High Spatial Resolution ◽  
Large Fraction ◽  
Near Field ◽  
Localized States ◽  
Emission Lines ◽  
Lateral Coupling ◽  
Self Assembled ◽  
Density Regime

ABSTRACTLateral coupling between separate quantum dots has been observed in a system of In0.55A10.45As self-assembled quantum dots. The experiment was performed by taking photoluminescence excitation (PLE) spectra in the optical near-field at 4.2 K. The high spatial resolution afforded by the near-field technique allows us to resolve individual dots in a density regime where interactions between neighboring dots become apparent. In the PLE spectra, narrow resonances are observed in the emission lines of individual dots. A large fraction of these resonances occur simultaneously in several emission lines, originating from different quantum dots. This is evidence of interdot scattering of carriers, which additional data show to be mediated by localized states at energies below the wetting layer exciton energy. A very rich phonon spectrum generated by the complicated interfaces between barrier and dot material is also evident in the data.

scholarly journals Near-field photochemical and radiation-induced chemical fabrication of nanopatterns of a self-assembled silane monolayer

2014 ◽  
Vol 5 ◽  
pp. 1441-1449 ◽  
Author(s):  
Ulrich Christian Fischer ◽  
Carsten Hentschel ◽  
Florian Fontein ◽  
Linda Stegemann ◽  
Christiane Hoeppener ◽  
...  
Keyword(s):  
Chemical Process ◽  
Oxygen Plasma ◽  
Near Field ◽  
General Concept ◽  
Photochemical Reactions ◽  
Self Assembled Monolayer ◽  
Photochemical Process ◽  
Radiation Induced ◽  
Oxygen Plasma Etching ◽  
Self Assembled

A general concept for parallel near-field photochemical and radiation-induced chemical processes for the fabrication of nanopatterns of a self-assembled monolayer (SAM) of (3-aminopropyl)triethoxysilane (APTES) is explored with three different processes: 1) a near-field photochemical process by photochemical bleaching of a monomolecular layer of dye molecules chemically bound to an APTES SAM, 2) a chemical process induced by oxygen plasma etching as well as 3) a combined near-field UV-photochemical and ozone-induced chemical process, which is applied directly to an APTES SAM. All approaches employ a sandwich configuration of the surface-supported SAM, and a lithographic mask in form of gold nanostructures fabricated through colloidal sphere lithography (CL), which is either exposed to visible light, oxygen plasma or an UV–ozone atmosphere. The gold mask has the function to inhibit the photochemical reactions by highly localized near-field interactions between metal mask and SAM and to inhibit the radiation-induced chemical reactions by casting a highly localized shadow. The removal of the gold mask reveals the SAM nanopattern.

Sign in / Sign up

Export Citation Format

Share Document