Two-photon photodynamic properties of TBO-AuNR-in-shell nanoparticles (Conference Presentation)

2016 ◽  
Author(s):  
Cheng-Han Wu ◽  
Chen-Sheng Yeh ◽  
Fong-Yu Cheng ◽  
Zen-Uong Tsai ◽  
Tzu-Ming Liu
Keyword(s):  
Shell Nanoparticles ◽  
Two Photon

scholarly journals Degradable gold core–mesoporous organosilica shell nanoparticles for two-photon imaging and gemcitabine monophosphate delivery

2017 ◽  
Vol 2 (4) ◽  
pp. 380-383 ◽  
Author(s):  
Saher Rahmani ◽  
Arnaud Chaix ◽  
Dina Aggad ◽  
Phuong Hoang ◽  
Basem Moosa ◽  
...  
Keyword(s):  
Shell Nanoparticles ◽  
Two Photon ◽  
Gold Core ◽  
Mesoporous Organosilica ◽  
Photon Imaging ◽  
Two Photon Imaging

The synthesis of degradable gold core–mesoporous organosilica shell nanoparticles is described.

Plasmon coupling-enhanced two-photon photoluminescence of Au@Ag core–shell nanoparticles and applications in the nuclease assay

Nanoscale ◽  
2015 ◽  
Vol 7 (22) ◽  
pp. 10233-10239 ◽  
Author(s):  
Peiyan Yuan ◽  
Rizhao Ma ◽  
Nengyue Gao ◽  
Monalisa Garai ◽  
Qing-Hua Xu
Keyword(s):  
Ag Nanoparticles ◽  
Plasmon Coupling ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
S1 Nuclease ◽  
Two Photon ◽  
Core Shell Nanoparticles ◽  
Nuclease Assay

Au@Ag nanoparticles were prepared to investigate composition dependent aggregation enhanced 2PPL and act as two-photon probe for S1 nuclease detection.

Amplified two-photon brightness in organic multicomponent nanoparticles

2015 ◽  
Vol 3 (28) ◽  
pp. 7483-7491 ◽  
Author(s):  
Elisa Campioli ◽  
Domna Maria Nikolaidou ◽  
Vincent Hugues ◽  
Marco Campanini ◽  
Lucia Nasi ◽  
...  
Keyword(s):  
Core Shell ◽  
Shell Nanoparticles ◽  
Two Photon ◽  
Core Shell Nanoparticles

A large amplification of the two-photon-induced luminescence is achieved in organic molecular-based core–shell nanoparticles.

scholarly journals Infrared Photon Pair-Production in Ligand-Sensitized Lanthanide Nanocrystals

2020 ◽  
Vol 8 ◽  
Author(s):  
Peter Agbo ◽  
Jacob S. Kanady ◽  
Rebecca J. Abergel
Keyword(s):  
Design Principle ◽  
Spectral Shift ◽  
Shell Nanoparticles ◽  
Two Photon ◽  
Photon Decay ◽  
Earth Core ◽  
Nir Emission ◽  
Infrared Photon ◽  
Core Shell Nanoparticles ◽  
Nanoparticle Core

This report details spectroscopic characterizations of rare-earth, core-shell nanoparticles decorated with the f-element chelator 3,4,3-LI(1,2-HOPO). Evidence of photon downconversion is corroborated through detailed power dependence measurements, which suggest two-photon decay paths are active in these materials, albeit only representing a minority contribution of the sum luminescence, with emission being dominated by normal, Stokes' shifted fluorescence. Specifically, ultraviolet ligand photosensitization of Nd3+ ions in a NaGdF4 host shell results in energy transfer to a Nd3+/Yb3+-doped NaGdF4 nanoparticle core. The population and subsequent decay of core, Yb3+2F5/2 states result in a spectral shift of 620 nm, manifested in a NIR emission displaying luminescence profiles diagnostic of Yb3+ and Nd3+ excited state decays. Emphasis is placed on the generality of this material architecture for realizing ligand-pumped, multi-photon downconversion, with the Nd3+/Yb3+ system presented here functioning as a working prototype for a design principle that may be readily extended to other lanthanide pairs.

Red-emitting, EtTP-5-based organic nanoprobes for two-photon imaging in 3D multicellular biological models

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65770-65774 ◽  
Author(s):  
Nathalie M. Pinkerton ◽  
Céline Frongia ◽  
Valérie Lobjois ◽  
Brian K. Wilson ◽  
Matthew J. Bruzek ◽  
...  
Keyword(s):  
Core Shell ◽  
Biological Models ◽  
Shell Nanoparticles ◽  
Two Photon ◽  
Photon Imaging ◽  
Two Photon Imaging ◽  
Core Shell Nanoparticles

Biocompatible and biostable EtTP-5-loaded organic core–shell nanoparticles have been successfully evaluated for their potential as red-emitting fluorescent nanoprobes for two-photon imaging.

Two-photon excitation microscopy in cellular biophysics

1995 ◽  
Vol 53 ◽  
pp. 62-63
Author(s):  
David W. Piston ◽  
Brian D. Bennett ◽  
Robert G. Summers
Keyword(s):  
Confocal Microscopy ◽  
Laser Beam ◽  
Duty Cycle ◽  
Excited Electronic State ◽  
Input Power ◽  
Two Photon ◽  
Simultaneous Absorption ◽  
Photon Excitation ◽  
Very High ◽  
Two Photon Excitation

Two-photon excitation microscopy (TPEM) provides attractive advantages over confocal microscopy for three-dimensionally resolved fluorescence imaging and photochemistry. Two-photon excitation arises from the simultaneous absorption of two photons in a single quantitized event whose probability is proportional to the square of the instantaneous intensity. For example, two red photons can cause the transition to an excited electronic state normally reached by absorption in the ultraviolet. In practice, two-photon excitation is made possible by the very high local instantaneous intensity provided by a combination of diffraction-limited focusing of a single laser beam in the microscope and the temporal concentration of 100 femtosecond pulses generated by a mode-locked laser. Resultant peak excitation intensities are 106 times greater than the CW intensities used in confocal microscopy, but the pulse duty cycle of 10-5 maintains the average input power on the order of 10 mW, only slightly greater than the power normally used in confocal microscopy.

Two-photon excitation fluorescence microscopy in living systems

1993 ◽  
Vol 51 ◽  
pp. 154-155 ◽  
Author(s):  
David W. Piston
Keyword(s):  
Confocal Microscopy ◽  
Fluorescence Microscopy ◽  
Singlet State ◽  
Excited Electronic State ◽  
Input Power ◽  
Two Photon ◽  
Simultaneous Absorption ◽  
Photon Excitation ◽  
Very High ◽  
Two Photon Excitation

Two-photon excitation fluorescence microscopy provides attractive advantages over confocal microscopy for three-dimensionally resolved fluorescence imaging. Two-photon excitation arises from the simultaneous absorption of two photons in a single quantitized event whose probability is proportional to the square of the instantaneous intensity. For example, two red photons can cause the transition to an excited electronic state normally reached by absorption in the ultraviolet. In our fluorescence experiments, the final excited state is the same singlet state that is populated during a conventional fluorescence experiment. Thus, the fluorophore exhibits the same emission properties (e.g. wavelength shifts, environmental sensitivity) used in typical biological microscopy studies. In practice, two-photon excitation is made possible by the very high local instantaneous intensity provided by a combination of diffraction-limited focusing of a single laser beam in the microscope and the temporal concentration of 100 femtosecond pulses generated by a mode-locked laser. Resultant peak excitation intensities are 106 times greater than the CW intensities used in confocal microscopy, but the pulse duty cycle of 10−5 maintains the average input power on the order of 10 mW, only slightly greater than the power normally used in confocal microscopy.

Second order interference in two photon absorption

1996 ◽  
Vol 43 (9) ◽  
pp. 1765-1771 ◽  
Author(s):  
M. W. HAMILTON and D. S. ELLIOTT
Keyword(s):  
Second Order ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon
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