Super-Coulombic Energy Transfer: Engineering Dipole-Dipole Interactions with Metamaterials

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
Ward D. Newman ◽  
Cristian L. Cortes ◽  
David Purschke ◽  
Amir Afshar ◽  
Zhijiang Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Dipole Interactions

scholarly journals Кинетика нарастания ап-конверсионной люминесценции кристалла LiY-=SUB=-0.8-=/SUB=-Yb-=SUB=-0.2-=/SUB=-F-=SUB=-4-=/SUB=- : Tm-=SUP=-3+-=/SUP=- (0.2 at.%) при импульсном возбуждении

2019 ◽  
Vol 61 (5) ◽  
pp. 953
Author(s):  
А.В. Михеев ◽  
Б.Н. Казаков
Keyword(s):  
Regression Analysis ◽  
Energy Transfer ◽  
Rare Earth ◽  
Laser Diode ◽  
Rare Earth Ions ◽  
Experimental Conditions ◽  
Pulsed Excitation ◽  
Transfer Processes ◽  
Dipole Interactions ◽  
Kinetics Of

AbstractThe regression analysis of the rise kinetics of up-conversion luminescence of the LiY_0.8Yb_0.2F_4:Tm^3+ (0.2 at %) crystal is performed. The kinetics curve is obtained with rectangular pulsed excitation by radiation from a laser diode (IR LD) with a wavelength of λ_ p = 933 nm. The most important—in these experimental conditions—mechanisms of the energy transfer from Yb^3+ ions to Tm^3+ ions are established, which are responsible for the transitions between the ground ^3 H _6 and excited ^3 F _4, ^3 H _4, ^1 G _4, ^1 D _2, and ^1 I _6 terms of the Tm^3+ ions. The durations of the relevant energy transfer processes are determined. It is shown that the energy transfer between rare earth ions in the LiY_0.8Yb_0.2F_4:Tm^3+ (0.2 at %) crystal occurs through the dipole–dipole interactions.

scholarly journals Coupling Parameters for Modeling the Near-Field Heat Transfer Between Molecules

2021 ◽  
Vol 9 ◽  
Author(s):  
Karthik Sasihithlu
Keyword(s):  
Heat Transfer ◽  
Energy Transfer ◽  
Dipole Moments ◽  
Near Field ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Orientation Factor ◽  
Dipole Interactions ◽  
Coupling Parameters ◽  
Drude Oscillators

The behavior of near-field heat transfer between molecules at gaps which are small compared to wavelength of light is greatly influenced by non-radiative dipole-dipole interactions between the molecules. Here we derive the coupling parameters and estimate the near-field heat transfer between two molecules using coupled Drude oscillators. The predictions from this model are verified with results from standard fluctuational electrodynamics principles. The effect of orientation factor of the dipole moments in the molecules traditionally taken into consideration for analysis of resonance energy transfer between molecules but hitherto overlooked for near-field heat transfer is also discussed.

Förster resonance energy transfer (FRET) and applications thereof

2020 ◽  
Vol 12 (46) ◽  
pp. 5532-5550
Author(s):  
Amrita Kaur ◽  
Pardeep Kaur ◽  
Sahil Ahuja
Keyword(s):  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Forster Resonance Energy Transfer ◽  
Förster Resonance Energy Transfer ◽  
Dipole Interactions ◽  
Nonradiative Process ◽  
Förster Resonance

FRET is a nonradiative process of energy transfer that is based on the dipole–dipole interactions between molecules that are fluorescent.

scholarly journals Multiplicity conversion based on intramolecular triplet-to-singlet energy transfer

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw5978 ◽  
Author(s):  
A. Cravcenco ◽  
M. Hertzog ◽  
C. Ye ◽  
M. N. Iqbal ◽  
U. Mueller ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet States ◽  
Spin States ◽  
Materials Chemistry ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Dipole Interactions ◽  
Molecular Spin ◽  
Excited Triplet States

The ability to convert between molecular spin states is of utmost importance in materials chemistry. Förster-type energy transfer is based on dipole-dipole interactions and can therefore theoretically be used to convert between molecular spin states. Here, a molecular dyad that is capable of transferring energy from an excited triplet state to an excited singlet state is presented. The rate of conversion between these states was shown to be 36 times faster than the rate of emission from the isolated triplet state. This dyad provides the first solid proof that Förster-type triplet-to-singlet energy transfer is possible, revealing a method to increase the rate of light extraction from excited triplet states.

FRET: A Spectral Ruler for Interacting Molecules Involved in Apoptosis

2000 ◽  
Vol 6 (S2) ◽  
pp. 830-831
Author(s):  
Victoria E. Centonze ◽  
Xiao H. Liang ◽  
Elizabeth A. Casanova ◽  
Beth Levine ◽  
Brian Herman
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Light Microscopy ◽  
Resonance Energy Transfer ◽  
Fluorescence Emission ◽  
Resonance Energy ◽  
Diffraction Limit ◽  
Concomitant Increase ◽  
Dipole Interactions ◽  
Donor And Acceptor

Fluorescence Resonance Energy Transfer (FRET) is a process by which a fluorophore (the donor) in the excited state transfers its energy to a neighboring fluorophore (the acceptor) non-radiatively through dipole-dipole interactions. Since the efficiency of energy transfer varies as the inverse of the sixth power of the distance separating the donor and acceptor chromophores, for FRET to occur the distance between the two molecules cannot exceed 10 to 100 angstroms (1 to l0nm). The combination of FRET and optical microscopy allows examination and quantitation of dynamic molecular interactions between cellular constituents at resolutions beyond the Abbe diffraction limit of light microscopy. Through the microscope one may detect FRET by an overall decrease in fluorescence emission of the donor with a concomitant increase in fluorescence emission of the acceptor.

Analyses of energy transfer of Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic powders at the 4T1 level of Cr3+ ion excitation

2021 ◽  
Author(s):  
Yoshiyuki Honda ◽  
Shinji Motokoshi ◽  
Takahisa Jitsuno ◽  
Kana Fujioka ◽  
Toshihiro Yamada ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Rate Equation ◽  
Energy Transfer Process ◽  
Fluorescence Decay ◽  
Rate Equations ◽  
Direct Transfer ◽  
Ceramic Powders ◽  
Dipole Interactions ◽  
Co Doped

Abstract The concentration dependence of energy transfer from Cr3+ to Nd3+ at the 4T1 level excitation in Nd/Cr:YAG was investigated by the fluorescence decay curves of Cr3+ and Nd3+ for Nd/Cr:YAG and Cr:YAG ceramic powders in the Cr3+ concentration range of 0.1 to 6.0 mol%. The energy transfer process between Cr3+ and Nd3+ at the 4T1 level excitation is tried to explain using a rate equation that assumes energy transfer from the 2E–4T2 level to Nd3+ on the basis of dipole–dipole interactions, the same as the 4T2 level excitation. In conclusion, the energy excited to the 4T1 level will relax non-radiatively to the 2E–4T2 level and then transfer to Nd3+. It is presumed there will be no direct transfer from the 4T1 level to Nd3+. Our rate equations will be useful when simultaneously exciting the 4T1 and 4T2 levels of Cr3+ in Nd/Cr:YAG using broadband pumping sources.

A quantitative approach to inner shell losses

1978 ◽  
Vol 36 (1) ◽  
pp. 526-527 ◽  
Author(s):  
R.D. Leapman ◽  
P. Rez ◽  
D.F. Mayers
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Accurate Determination ◽  
Background Intensity ◽  
Core Excitation ◽  
Quantitative Basis ◽  
Cross Section Differential ◽  
Bound Electrons

Microanalysis by EELS has been developing rapidly and though the general form of the spectrum is now understood there is a need to put the technique on a more quantitative basis (1,2). Certain aspects important for microanalysis include: (i) accurate determination of the partial cross sections, σx(α,ΔE) for core excitation when scattering lies inside collection angle a and energy range ΔE above the edge, (ii) behavior of the background intensity due to excitation of less strongly bound electrons, necessary for extrapolation beneath the signal of interest, (iii) departures from the simple hydrogenic K-edge seen in L and M losses, effecting σx and complicating microanalysis. Such problems might be approached empirically but here we describe how computation can elucidate the spectrum shape.The inelastic cross section differential with respect to energy transfer E and momentum transfer q for electrons of energy E0 and velocity v can be written as

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