scholarly journals Energy migration in molecular assemblies: the characterisation and differentiation of two-photon mechanisms

2006 ◽  
Author(s):  
David S. Bradshaw ◽  
David L. Andrews
Keyword(s):  
Energy Migration ◽  
Molecular Assemblies ◽  
Two Photon

On the analyses of fluorescence depolarisation data in the presence of electronic energy migration. Part II: Applying and evaluating two-photon excited fluorescence

2012 ◽  
Vol 14 (6) ◽  
pp. 1917
Author(s):  
Oleg Opanasyuk ◽  
Therese Mikaelsson ◽  
Linus Ryderfors ◽  
Emad Mukhtar ◽  
Lennart B.-Å. Johansson
Keyword(s):  
Electronic Energy ◽  
Energy Migration ◽  
Two Photon

Two-photon excited fluorescence depolarisation and electronic energy migration within donor–donor pairs

2009 ◽  
Vol 11 (33) ◽  
pp. 7152 ◽  
Author(s):  
Oleg Opanasyuk ◽  
Linus Ryderfors ◽  
Emad Mukhtar ◽  
Lennart B.-Å. Johansson
Keyword(s):  
Electronic Energy ◽  
Energy Migration ◽  
Two Photon

Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies

2016 ◽  
Vol 52 (31) ◽  
pp. 5354-5370 ◽  
Author(s):  
Nobuhiro Yanai ◽  
Nobuo Kimizuka
Keyword(s):  
Excitation Power ◽  
Energy Migration ◽  
Molecular Assemblies ◽  
Triplet Energy ◽  
Feature Article ◽  
Highly Efficient ◽  
Recent Emergence

This Feature Article reviews an emerging field of triplet energy migration-based photon upconversion (TEM-UC) that allows highly efficient photon upconversion at low excitation power.

scholarly journals Correction: Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies

2017 ◽  
Vol 53 (3) ◽  
pp. 655-655 ◽  
Author(s):  
Nobuhiro Yanai ◽  
Nobuo Kimizuka
Keyword(s):  
Energy Migration ◽  
Molecular Assemblies ◽  
Triplet Energy ◽  
Recent Emergence

Correction for ‘Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies’ by Nobuhiro Yanai et al., Chem. Commun., 2016, 52, 5354–5370.

scholarly journals Two-photon induced isomerization through a cyaninic molecular antenna in azo compounds

2021 ◽  
Author(s):  
Emmanuel Villatoro ◽  
Leonardo Muñoz-Rugeles ◽  
Jesús Durán-Hernández ◽  
Bernardo Salcido-Santacruz ◽  
Nuria Esturau-Escofet ◽  
...  
Keyword(s):  
Excited State ◽  
Excitation Energy ◽  
Energy Migration ◽  
Azo Compounds ◽  
Singlet Excited State ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Upon two photon excitation, energy migration from the antenna-localized second singlet excited state to the stilbenyl-azopyrrole section allows for efficient indirect excitation and phototransformation of this actuator.

scholarly journals Triplet energy migration-based photon upconversion by amphiphilic molecular assemblies in aerated water

2016 ◽  
Vol 7 (8) ◽  
pp. 5224-5229 ◽  
Author(s):  
Hironori Kouno ◽  
Taku Ogawa ◽  
Shogo Amemori ◽  
Prasenjit Mahato ◽  
Nobuhiro Yanai ◽  
...  
Keyword(s):  
Self Assembly ◽  
Energy Migration ◽  
Molecular Assemblies ◽  
Triplet Energy ◽  
Outstanding Issue

A molecular self-assembly approach is developed to resolve an outstanding issue in triplet energy migration-based photon upconversion (TEM-UC), that is, air-stable TEM-UC in water.

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.

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