scholarly journals Спектры поглощения пробного сигнала и резонансной флуоресценции для излучателей при их взаимодействии с локальным окружением в прозрачных средах

2022 ◽  
Vol 130 (1) ◽  
pp. 151
Author(s):  
Е.A. Смирнова ◽  
Н.А. Лозинг ◽  
М.Г. Гладуш ◽  
А.В. Наумов
Keyword(s):  
Local Field ◽  
Fluorescence Spectra ◽  
Dielectric Medium ◽  
Relaxation Processes ◽  
Local Electron ◽  
Light Emitters ◽  
Probe Field ◽  
Spectral Curves ◽  
Transparent Dielectric ◽  
Field Influence

The current paper demonstrates theoretical analysis of two types of spectral curves for several configurations of system of two-level light emitters, considering the influence of local field and close environment inside a transparent medium. Probe field absorption spectra and resonant fluorescence spectra are calculated under excitation of a strong monochromatic cw laser. The sensitivity of absorption and emission optical spectroscopy method is compared for revealing the effects of the medium on individual emitters and their ensembles. Spectral curves were calculated for model emitters considering local field influence of a transparent dielectric medium and local electron-phonon interactions, which determined the response of the emitters to an external laser field and effective relaxation mechanisms. The calculation formalism is based on a semiclassical approach, while the relaxation processes associated with the phonon contribution are introduced phenomenologically with references to other studies.

Electrodeposition of Novel Cross-Linked Poly(methacrylic acid) Functionalized Poly(9-aminofluorene) Network Films

2014 ◽  
Vol 937 ◽  
pp. 23-28
Author(s):  
Dan Cheng ◽  
Bao Yang Lu ◽  
Wei Qiang Zhou ◽  
Jing Kun Xu
Keyword(s):  
Sulfuric Acid ◽  
Solid State ◽  
Methacrylic Acid ◽  
Fluorescence Spectra ◽  
Green Light ◽  
Redox Activity ◽  
Structure Stability ◽  
Light Emitters ◽  
Precursor Polymer ◽  
Concentrated Sulfuric Acid

Four novel cross-linked network conjugated poly (methacrylic acid) functionalized poly (9-aminofluorene) films were prepared by a precursor polymer approach, i.e., poly { poly [ N - (9H-fluoren-9-yl) methacrylamide ] } (P1), poly { poly [ N - (9H-fluoren-9-yl) methacrylamide-co-methacrylic acid ] } (P3), poly { poly [ N - (9H-fluoren-9-yl) methacrylamide] -co-9-aminofluorene } (P2) and poly { poly [ N - (9H-fluoren-9-yl) methacrylamide-co-methacrylic acid ] -co-9-aminofluorene } (P4). As-prepared polymer films had good redox activity and structure stability in concentrated sulfuric acid. Fluorescence spectra indicated that the soluble cross-linked polymers were good blue light emitters and in solid state they were blue-green light emitters.

Noncubic Local Structure in a Pr3+ -Doped SeOCl2:SnCl4 Solution

1973 ◽  
Vol 51 (18) ◽  
pp. 1918-1922
Author(s):  
A. Watanabe
Keyword(s):  
Symmetry Group ◽  
Computer Analysis ◽  
Local Field ◽  
Local Structure ◽  
Fluorescence Spectra ◽  
High Symmetry ◽  
Tetrahedral Symmetry ◽  
Number Of Components ◽  
Residual Part ◽  
Theoretical Considerations

From a computer analysis of the fluorescence spectra of Pr3+ ions in a SeOCl2 solvent host, we show the existence of three components in the 3P0 → 3H4 transition. The small number of components suggests that each ion interacts with a local field of high symmetry. Group-theoretical considerations are shown to lead to the conclusion that the local field consists of a cubic part of tetrahedral symmetry and a residual part of D2d symmetry.

Local field and radiative relaxation rate in a dielectric medium

2011 ◽  
Vol 113 (4) ◽  
pp. 647-658 ◽  
Author(s):  
D. V. Kuznetsov ◽  
Vl. K. Roerich ◽  
M. G. Gladush
Keyword(s):  
Relaxation Rate ◽  
Local Field ◽  
Dielectric Medium ◽  
Radiative Relaxation

scholarly journals Quadratic Electro-Optic Effect in Metal Nanoparticles in a Transparent Dielectric Medium

2019 ◽  
Vol 9 (2) ◽  
pp. 232 ◽  
Author(s):  
Mrinal Thakur ◽  
Justin Van Cleave
Keyword(s):  
Gold Nanoparticles ◽  
Metal Nanoparticles ◽  
Low Cost ◽  
Dielectric Medium ◽  
Metallic Particles ◽  
Transparent Dielectric ◽  
Electro Optic ◽  
Kerr Coefficient ◽  
New Applications ◽  
First Time

The quadratic electro-optic effect/Kerr coefficients were measured for the first time for metal nanoparticles. In particular, gold nanoparticles in glass were studied. Measurements were made using the field-induced birefringence method at a wavelength near the onset of the surface plasmon resonance. The magnitudes of the Kerr coefficients for different sizes of gold nanoparticles in glass were measured and compared with that of subnanometer size metallic particles in non-conjugated conductive polymers. The magnitude of the Kerr coefficient was found to increase rapidly (about d−3) when the diameter, d, of the nanoparticles was decreased. This is consistent with the existing theories and understanding of nonlinear optics in metal nanoparticles. The results imply a broad range of new applications of metal nanoparticles in electro-optic switching/modulation, low-cost Kerr cells and other uses in optoelectronics.

scholarly journals THE GRAVITATIONAL VAVILOV–CHERENKOV EFFECT

1998 ◽  
Vol 13 (19) ◽  
pp. 1557-1564 ◽  
Author(s):  
ALBERTO SAA ◽  
MARCELO SCHIFFER
Keyword(s):  
Black Hole ◽  
Degrees Of Freedom ◽  
Binary Systems ◽  
Dielectric Medium ◽  
Primordial Black Holes ◽  
Area Theorem ◽  
Relativistic Case ◽  
Cherenkov Effect ◽  
Transparent Dielectric ◽  
Complete Analogy

In this letter we show that an uncharged black hole moving superluminally in a transparent dielectric medium violates Hawking's area theorem. The violation can be overcome through the emission of radiation. Since modes cannot emerge from the black hole itself, this radiation must originate from a collective effect in the medium, in complete analogy with the Vavilov–Cherenkov effect. However, because the black hole is uncharged, the emission mechanism must be different. We discuss the physical origin of the effect and obtain a Newtonian estimation. Then we obtain the appropriate equations in the relativistic case and show that the field which is radiated away is a combination of gravitational and electromagnetic degrees of freedom. Possible astrophysical relevance for the detection of primordial black holes and binary systems is discussed.

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