Resonance enhancement of two photon absorption by magnetically trapped atoms in strong rf-fields

In this paper, the nonlinear absorption properties of two complexes consisting of Ru(C≡CPh)(C≡C)(dppe)2 (dppe = Ph2PCH2CH2PPh2) as electron donor (D) and 4,7-di(2-thienyl)benzo[c][1,2,5]thiadiazole as electron acceptor (A) units in two different arrangement, i.e., A–D–A and D–A–D, are presented. They were measured in solution by the femtosecond open-aperture Z-scan method. The complexes show moderate two-photon absorption cross-sections σ(2) of several hundred to one thousand GM (here 1 GM = 10−50 cm4 s molecule−1 photon−1). Although they are formed by the same building units, it was found that the two-photon absorption values of the D–A–D arrangement are six times higher than that of the A–D–A one. This difference can be explained by the number of metal cores (one or two ruthenium centers), the geometrical configurations of the complexes (more or less planar), and the resonance enhancement by lowering the intermediate state.

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Resonance Enhancement of the Two-Photon Absorption in PbS Quantum Dots

10.1364/fio.2010.ftho2 ◽

2010 ◽

Author(s):

Gero Nootz ◽

Lazaro A. Padilha ◽

Scott Webster ◽

David J. Hagan ◽

Eric W. Van Stryland ◽

...

Keyword(s):

Quantum Dots ◽

Photon Absorption ◽

Two Photon Absorption ◽

Two Photon ◽

Resonance Enhancement ◽

Pbs Quantum Dots

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Resonance Enhancement of Two-Photon Absorption in Fluorescent Proteins

The Journal of Physical Chemistry B ◽

10.1021/jp075879k ◽

2007 ◽

Vol 111 (50) ◽

pp. 14051-14054 ◽

Cited By ~ 41

Author(s):

M. Drobizhev ◽

N. S. Makarov ◽

T. Hughes ◽

A. Rebane

Keyword(s):

Fluorescent Proteins ◽

Photon Absorption ◽

Two Photon Absorption ◽

Two Photon ◽

Resonance Enhancement

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Soluble meso-tetrakis(arylethynyl)porphyrins — synthesis and optical properties

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424614500904 ◽

2014 ◽

Vol 18 (10n11) ◽

pp. 998-1013 ◽

Cited By ~ 6

Author(s):

Agnieszka Nowak-Król ◽

Łukasz G. Łukasiewicz ◽

Joy E. Haley ◽

Mikhail Drobizhev ◽

Aleksander Rebane ◽

...

Keyword(s):

Optical Properties ◽

Red Light ◽

Photon Absorption ◽

Two Photon Absorption ◽

Two Photon ◽

Resonance Enhancement ◽

Order Of Magnitude ◽

Homo And Lumo ◽

The One ◽

First Time

Trans- A 2 B 2-tetrakis(arylethynyl)porphyrins with suitable solubility in CH 2 Cl 2, CHCl 3, EtOAc , acetone and toluene have been obtained for the first time. Among two possible strategies the one comprising the synthesis of 5,15-dibromo-10,20-bis[(isopropylsilyl)ethynyl]porphyrin proved to be more efficient. The pathway towards densely substituted arylacetylenes has been optimized. The use of previously identified 3,4,5-trialkoxyaryl substituent was crucial for achieving the reasonable solubility. The optical properties of meso-substituted tetrakis(arylethynyl)porphyrins were studied showing that strong polarization imparted by direct conjugation of all four substituents with porphyrin core resulted not only in strong absorption of red light but also in a relatively long triplet lifetime. Meso-tetrakis(arylethynyl)porphyrins have a significantly longer lifetime of T1 state than bis(arylethynyl)porphyrins and in their case all the states are mixtures of transitions between the HOMO-1, HOMO and LUMO, LUMO+1 MOs. We show that the presence of two additional arylethynyl substituents at meso-positions enhance the maximum two-photon absorption cross-section of trans- A 2 B 2-tetrakis(arylethynyl)porphyrins by more than one order of magnitude. Maximum values as high as σ2 = 500 GM at 950 nm result from realization of suitable conditions for effective resonance enhancement along with a lowering of the energy and intensification of the two-photon allowed transitions in the Soret region.

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