scholarly journals Исследование влияния легирования железом на люминесценцию монокристаллов селенида цинка

2019 ◽  
Vol 53 (1) ◽  
pp. 5
Author(s):  
А.А. Гладилин ◽  
Н.Н. Ильичев ◽  
В.П. Калинушкин ◽  
М.И. Студеникин ◽  
О.В. Уваров ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Zinc Selenide ◽  
Iron Concentration ◽  
Two Photon ◽  
Low Intensity ◽  
Defect Centers ◽  
Impurity Defect ◽  
High Iron Concentration ◽  
Defect Luminescence ◽  
Crystal Bulk

AbstractThe effect of doping with iron (thermal diffusion from a surface) on the luminescence of zinc-selenide single crystals in the wavelength range 0.44–0.72 μm and on the spatial distribution of luminescence centers are studied. By means of two-photon confocal microscopy, planar and volume maps of edge (exciton) and impurity–defect luminescence in the above-indicated spectral range are obtained for both doped and undoped crystals. It is shown that crystal regions containing a high iron concentration exhibit low-intensity luminescence in this range. It is found that, in the process of diffusion, several types of impurity–defect centers distributed in a complex way within the crystal bulk are formed. The nature of these centers is discussed.

Spatial Distribution of Impurity Defect Centers in Fe-Doped Polycrystalline Zinc Selenide

2019 ◽  
Vol 55 (5) ◽  
pp. 423-431 ◽  
Author(s):  
S. S. Balabanov ◽  
E. M. Gavrishchuk ◽  
A. A. Gladilin ◽  
V. B. Ikonnikov ◽  
N. N. Il’ichev ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Zinc Selenide ◽  
Defect Centers ◽  
Polycrystalline Zinc ◽  
Impurity Defect

scholarly journals Исследование мощности люминесценции экситонов и примесно-дефектных центров, возбуждаемых с помощью двухфотонного поглощения

2020 ◽  
Vol 54 (1) ◽  
pp. 48
Author(s):  
А.А. Гладилин ◽  
В.П. Данилов ◽  
Н.Н. Ильичев ◽  
В.П. Калинушкин ◽  
М.И. Студеникин ◽  
...  
Keyword(s):  
Radiation Power ◽  
Average Power ◽  
Electronic System ◽  
Quadratic Character ◽  
Degree Of Contamination ◽  
Two Photon ◽  
Defect Centers ◽  
Photon Excitation ◽  
Impurity Defect ◽  
Two Photon Excitation

In the present work, using as an example ZnSe: Fe2+ single crystals, it was experimentally and theoretically studied the effect of the average power of femtosecond laser radiation on the average luminescence power of excitons and impurity-defect centers upon two-photon excitation of the electronic system of a crystal. It has been experimentally shown that the average luminescence power of crystal excitons in the studied range of excitation powers is proportional to 4 degrees of the average excitation radiation power. The average luminescence power of impurity-defect centers has a quadratic character. A theory is constructed that explains the experimentally observed dependencies. It is noted that the nature of the dependence of the crystal luminescence on the pump power during two-photon excitation can be used to estimate the degree of contamination of the crystal by impurity-defect centers.

Study of the Luminescence Power of Excitons and Impurity–Defect Centers Excited via Two-Photon Absorption

2020 ◽  
Vol 54 (1) ◽  
pp. 67-72
Author(s):  
A. A. Gladilin ◽  
V. P. Danilov ◽  
N. N. Il’ichev ◽  
V. P. Kalinushkin ◽  
M. I. Studenikin ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Defect Centers ◽  
Impurity Defect

Pulse Energy Dependence of Defect Generation in Bragg Grating Optical Fiber Materials

1991 ◽  
Vol 244 ◽  
Author(s):  
T. E. Tsai ◽  
C. G. Askins ◽  
E. J. Friebele
Keyword(s):  
Second Harmonic ◽  
Photon Absorption ◽  
Bragg Grating ◽  
Paramagnetic Centers ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Low Intensity ◽  
Defect Centers ◽  
Spin Resonance ◽  
Fiber Materials

ABSTRACTGe-associated defect centers induced by 5 eV (∼ 245 nm) photons of various intensities in Ge-doped silica were studied using electron spin resonance (ESR). We found that Ge E' centers observed in Bragg grating Ge-doped silica core fibers are induced and bleached by one- and two-photon absorption processes, respectively. The observation that Ge E's are the only paramagnetic centers induced by low intensity 5 eV photons supports the proposal that the Ge E' center is responsible for the photoinduced structures observed in both Bragg grating and second-harmonic-generation (SHG) fibers.

Effect of Zinc Atmosphere upon Doping ZnSe : Fe Crystals on the Composition and Distribution of Impurity-Defect Centers

2020 ◽  
Vol 47 (8) ◽  
pp. 237-243
Author(s):  
A. A. Gladilin ◽  
S. I. Chentsov ◽  
S. A. Mironov ◽  
O. V. Uvarov ◽  
N. N. Ilichev ◽  
...  
Keyword(s):  
Defect Centers ◽  
Impurity Defect

Spatial distribution of two-photon-excited fluorescence in scattering media

1999 ◽  
Vol 38 (1) ◽  
pp. 224 ◽  
Author(s):  
Jinpin Ying ◽  
Feng Liu ◽  
R. R. Alfano
Keyword(s):  
Spatial Distribution ◽  
Scattering Media ◽  
Two Photon

Spatial distribution of electrons ejected by two-photon excitation of aromatic molecules in polymer systems

2001 ◽  
Vol 60 (4-5) ◽  
pp. 427-432 ◽  
Author(s):  
Hideo Ohkita ◽  
Hironori Ishii ◽  
Takeo Ogi ◽  
Shinzaburo Ito ◽  
Masahide Yamamoto
Keyword(s):  
Spatial Distribution ◽  
Polymer Systems ◽  
Aromatic Molecules ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

scholarly journals Spatial Distribution of Defect Luminescence in ZnO Nanorods: An Investigation by Spectral Cathodoluminescence Imaging

2018 ◽  
Vol 215 (19) ◽  
pp. 1800389 ◽  
Author(s):  
Liangchen Zhu ◽  
Mark Lockrey ◽  
Matthew R. Phillips ◽  
Cuong Ton-That
Keyword(s):  
Spatial Distribution ◽  
Zno Nanorods ◽  
Cathodoluminescence Imaging ◽  
Defect Luminescence

scholarly journals Powering rotary molecular motors with low-intensity near-infrared light

2020 ◽  
Vol 6 (44) ◽  
pp. eabb6165
Author(s):  
Lukas Pfeifer ◽  
Nong V. Hoang ◽  
Maximilian Scherübl ◽  
Maxim S. Pshenichnikov ◽  
Ben L. Feringa
Keyword(s):  
Smart Materials ◽  
Molecular Motors ◽  
Near Infrared ◽  
In Vivo Studies ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Two Photon ◽  
Low Intensity

Light-controlled artificial molecular machines hold tremendous potential to revolutionize molecular sciences as autonomous motion allows the design of smart materials and systems whose properties can respond, adapt, and be modified on command. One long-standing challenge toward future applicability has been the need to develop methods using low-energy, low-intensity, near-infrared light to power these nanomachines. Here, we describe a rotary molecular motor sensitized by a two-photon absorber, which efficiently operates under near-infrared light at intensities and wavelengths compatible with in vivo studies. Time-resolved spectroscopy was used to gain insight into the mechanism of energy transfer to the motor following initial two-photon excitation. Our results offer prospects toward in vitro and in vivo applications of artificial molecular motors.

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