scholarly journals Dynamics of hot carriers in plasmonic heterostructures

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Anton Yu. Bykov ◽  
Diane J. Roth ◽  
Giovanni Sartorello ◽  
Jorge U. Salmón-Gamboa ◽  
Anatoly V. Zayats
Keyword(s):  
Pt Nanoparticles ◽  
Hot Electron ◽  
Hot Carriers ◽  
Time Resolved ◽  
Nanoscale Systems ◽  
Hot Carrier ◽  
Photoluminescence Lifetime ◽  
Electron Sink ◽  
Time Resolved Photoluminescence ◽  
Dependent Behaviour

Abstract Understanding and optimising the mechanisms of generation and extraction of hot carriers in plasmonic heterostructures is important for applications in new types of photodetectors, photochemistry and photocatalysis, as well as nonlinear optics. Here, we show using transient dynamic measurements that the relaxation of the excited hot-carriers in Au/Pt hetero-nanostructures is accelerated through the transfer pathway from Au, where they are generated, to Pt nanoparticles, which act as a hot-electron sink. The influence of the environment on the dynamics was also demonstrated. The time-resolved photoluminescence measurements confirm the modified hot-electron dynamics, revealing quenching of the photoluminescence signal from Au nanoparticles in the presence of Pt and an increased photoluminescence lifetime. These observations are signatures of the improved extraction efficiency of hot-carriers by the Au/Pt heterostructures. The results give insight into the time-dependent behaviour of excited compound nanoscale systems and provide a way of controlling the relaxation mechanisms involved, with important consequences for engineering nonlinear optical response and hot-carrier-assisted photochemistry.

Determining plasmonic hot-carrier energy distributions via single-molecule transport measurements

Science ◽  
2020 ◽  
pp. eabb3457 ◽  
Author(s):  
Harsha Reddy ◽  
Kun Wang ◽  
Zhaxylyk Kudyshev ◽  
Linxiao Zhu ◽  
Shen Yan ◽  
...  
Keyword(s):  
Single Molecule ◽  
Plasmonic Nanostructures ◽  
Hot Carriers ◽  
Energy Distributions ◽  
Nanoscale Systems ◽  
Hot Carrier ◽  
Transport Measurements ◽  
Single Molecule Junctions ◽  
Molecule Transport ◽  
Carrier Energy

Hot-carriers in plasmonic nanostructures, generated via plasmon decay, play key roles in applications like photocatalysis and in photodetectors that circumvent band-gap limitations. However, direct experimental quantification of steady-state energy distributions of hot-carriers in nanostructures has so far been lacking. We present transport measurements from single-molecule junctions, created by trapping suitably chosen single molecules between an ultra-thin gold film supporting surface plasmon polaritons and a scanning probe tip, that can provide quantification of plasmonic hot-carrier distributions. Our results show that Landau damping is the dominant physical mechanism of hot-carrier generation in nanoscale systems with strong confinement. The technique developed in this work will enable quantification of plasmonic hot-carrier distributions in nanophotonic and plasmonic devices.

scholarly journals Spectral and time-resolved photoluminescence of human platelets doped with platinum nanoparticles

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0256621
Author(s):  
Karina Matveeva ◽  
Andrey Zyubin ◽  
Elizaveta Demishkevich ◽  
Vladimir Rafalskiy ◽  
Ekaterina Moiseeva ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Pt Nanoparticles ◽  
Human Platelets ◽  
Platelet Membrane ◽  
Spectroscopy Analysis ◽  
Time Resolved ◽  
Transfer Parameters ◽  
Time Resolved Photoluminescence

This paper describes a detailed study of spectral and time-resolved photoprocesses in human platelets and their complexes with platinum (Pt) nanoparticles (NPs). Fluorescence, quantum yield, and platelet amino acid lifetime changes in the presence and without femtosecond ablated platinum NPs have been studied. Fluorescence spectroscopy analysis of main fluorescent amino acids and their residues (tyrosine (Tyr), tryptophan (Trp), and phenylalanine (Phe)) belonging to the platelet membrane have been performed. The possibility of energy transfer between Pt NPs and the platelet membrane has been revealed. Förster Resonance Energy Transfer (FRET) model was used to perform the quantitative evaluation of energy transfer parameters. The prospects of Pt NPs usage deals with quenching-based sensing for pathology’s based on platelet conformations as cardiovascular diseases have been demonstrated.

scholarly journals Фотолюминесценция с временным разрешением наноструктур InGaAs различной квантовой размерности

2019 ◽  
Vol 53 (11) ◽  
pp. 1520
Author(s):  
А.М. Надточий ◽  
С.А. Минтаиров ◽  
Н.А. Калюжный ◽  
М.В. Максимов ◽  
Д.А. Санников ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Well ◽  
Single Photon ◽  
Photon Counting ◽  
Dimensional Structure ◽  
Time Resolved ◽  
Single Photon Counting ◽  
Gaas Substrates ◽  
Photoluminescence Lifetime ◽  
Time Resolved Photoluminescence

By using time-correlated single-photon counting time-resolved photoluminescence of quantum-sized heterostructures of different dimensionality was investigated. InGaAs quantum dots, quantum well, and transitionally-dimensional structure — quantum well-dots were grown on GaAs substrates. It was observed, that photoluminescence decay strongly depends on structure dimensionality resulting in decay value of 6,7, and more than 20 ns for quantum dots, well-dots and well, respectively. As we believe localization centers in heterostructures may be responsible for such shortening of photoluminescence lifetime.

Time-Resolved Photoluminescence of Two-Dimensional Hot Carriers in GaAs-AlGaAs Heterostructures

1984 ◽  
Vol 53 (19) ◽  
pp. 1841-1844 ◽  
Author(s):  
J. F. Ryan ◽  
R. A. Taylor ◽  
A. J. Turberfield ◽  
Angela Maciel ◽  
J. M. Worlock ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Hot Carriers ◽  
Time Resolved ◽  
Time Resolved Photoluminescence

Exploring the Potential of Time-Resolved Photoluminescence Spectroscopy for the Detection of Plastics

2020 ◽  
Vol 74 (9) ◽  
pp. 1161-1166
Author(s):  
Sebastian Gies ◽  
Eva-Marie Schömann ◽  
Julia Anna Prume ◽  
Martin Koch
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Terrestrial Ecosystems ◽  
Photoluminescence Spectroscopy ◽  
Time Resolved ◽  
Plastic Materials ◽  
Photoluminescence Lifetime ◽  
Ft Ir ◽  
Time Resolved Photoluminescence ◽  
Ft Ir Spectroscopy

Accurate data on microplastic occurrence in aquatic and terrestrial ecosystems are a basic requirement for microplastic risk assessment and management. Existing analysis techniques like Raman spectroscopy and Fourier transform infrared (FT-IR) spectroscopy imaging are still time-consuming and depend on laborious sample preparation. Therefore, we investigate the potential of time-resolved photoluminescence spectroscopy as an alternative technique to identify plastic materials, and, for the first time determine the photoluminescence lifetime of a series of polymers and several non-plastic samples typically found in a marine environment. The obtained photoluminescence lifetimes can be used to distinguish between plastic and natural materials. Furthermore, they allow us to identify distinct types of plastics. Therefore, the described approach has the potential to identify materials either as a stand-alone technique or for pre-characterization of sample materials for otherwise time-consuming analytical methods such as Raman spectroscopy or FT-IR spectroscopy.

Time-resolved photoluminescence lifetime measurements of the Γ5 and Γ6 free excitons in ZnO

2000 ◽  
Vol 88 (4) ◽  
pp. 2152-2153 ◽  
Author(s):  
D. C. Reynolds ◽  
D. C. Look ◽  
B. Jogai ◽  
J. E. Hoelscher ◽  
R. E. Sherriff ◽  
...  
Keyword(s):  
Lifetime Measurements ◽  
Time Resolved ◽  
Photoluminescence Lifetime ◽  
Time Resolved Photoluminescence

scholarly journals Ab initio study of hot electrons in GaAs

2015 ◽  
Vol 112 (17) ◽  
pp. 5291-5296 ◽  
Author(s):  
Marco Bernardi ◽  
Derek Vigil-Fowler ◽  
Chin Shen Ong ◽  
Jeffrey B. Neaton ◽  
Steven G. Louie
Keyword(s):  
Ab Initio ◽  
Phonon Scattering ◽  
Carrier Dynamics ◽  
Hot Electrons ◽  
Hot Electron ◽  
Hot Carriers ◽  
Hot Carrier ◽  
Acoustic Modes ◽  
Decay Times ◽  
Electron Phonon Scattering

Hot carrier dynamics critically impacts the performance of electronic, optoelectronic, photovoltaic, and plasmonic devices. Hot carriers lose energy over nanometer lengths and picosecond timescales and thus are challenging to study experimentally, whereas calculations of hot carrier dynamics are cumbersome and dominated by empirical approaches. In this work, we present ab initio calculations of hot electrons in gallium arsenide (GaAs) using density functional theory and many-body perturbation theory. Our computed electron–phonon relaxation times at the onset of the Γ, L, and X valleys are in excellent agreement with ultrafast optical experiments and show that the ultrafast (tens of femtoseconds) hot electron decay times observed experimentally arise from electron–phonon scattering. This result is an important advance to resolve a controversy on hot electron cooling in GaAs. We further find that, contrary to common notions, all optical and acoustic modes contribute substantially to electron–phonon scattering, with a dominant contribution from transverse acoustic modes. This work provides definitive microscopic insight into hot electrons in GaAs and enables accurate ab initio computation of hot carriers in advanced materials.

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