Fused, Three-Ring Donor-Acceptor Molecules as Potential Materials for Efficient Second Harmonic Generation

1989 ◽  
Vol 173 ◽  
Author(s):  
Malcolm R. McLean ◽  
Mamoun Badr ◽  
Larry R. Dalton ◽  
Robert L. S. Devine ◽  
William H. Steier
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Crystal Habit ◽  
Organic Crystals ◽  
X Ray Diffraction ◽  
Ring Compounds ◽  
Donor Acceptor ◽  
Linear Optical Properties ◽  
Corona Poling

ABSTRACTA series of fused three-ring compounds have been synthesized and characterized for their possible use as organic crystals for second-harmonic generation. Polymer films doped with these compounds were aligned via corona poling and their second order non-linear optical properties compared with layers doped with stilbene like molecules. Values of ¼β0 have been obtained and the effects of different heteroatoms and substituents on λ max and on ¼β0 were examined. An X-ray diffraction crystal structure on one member of the series, 1,2,4-Trichloro-8-nitro-phenoxazin-3-one (Compound 1), revealed a centrosymmetric crystal habit in a P21/n space group, with a = 9.829(3), b = 8.300(2) and c = 15.542(4) Å. Final R(F) = 0.0939 for 754 reflections where I σ; 3σ(I).

2,4-Bis[4-(dihexadecylamino)-2-hydroxyphenyl]-squaraine: Second-Harmonic Generation from Langmuir - Blodgett Monolayers of a Centro-symmetric Dye in which the Chromophores are Isolated from the Substrate

1999 ◽  
Vol 52 (1) ◽  
pp. 37 ◽  
Author(s):  
Geoffrey J. Ashwell ◽  
Patricia C. Williamson ◽  
Gurmit S. Bahra ◽  
Christopher R. Brown
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Hydrophobic Barrier ◽  
Hemicyanine Dye ◽  
Donor Acceptor ◽  
The Mean ◽  
Donor Moiety

2,4-Bis[4-(dihexadecylamino)-2-hydroxyphenyl]squaraine is vertically oriented in the Langmuir–Blodgett film and the chromophore layer is separated from the glass substrate by the hydrophobic dihexadecylamino groups. The Langmuir–Blodgett monolayer exhibits moderately strong second-harmonic generation (SHG) with an effective susceptibility of c. 10 pm V-1 at 1064 nm and an intensity, relative to the mean SHG from films of the extensively studied hemicyanine dye (E)-4-[2-(4-dimethylaminophenyl)ethenyl]-N-docosylpyridinium bromide, of c. 0·3. The SHG cannot arise from the polarization of the dye by the underlying substrate because the conjugated donor-(acceptor)-donor moiety is separated by a 2 nm thick hydrophobic barrier. Instead, the non-linear optical behaviour is attributed to a non-centrosymmetric aggregate structure.

Local structure of the B4 phase studied by second harmonic generation and X-ray diffraction measurements

2009 ◽  
Vol 19 (29) ◽  
pp. 5161 ◽  
Author(s):  
Josu Martínez-Perdiguero ◽  
Ibon Alonso ◽  
César L. Folcia ◽  
Jesús Etxebarria ◽  
Josu Ortega
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Local Structure ◽  
Second Harmonic ◽  
X Ray Diffraction ◽  
X Ray

Second-harmonic generation in vinylidene fluoride-trifluoroethylene copolymers doped with donor-acceptor molecules

2002 ◽  
Vol 47 (2) ◽  
pp. 330-334 ◽  
Author(s):  
K. A. Verkhovskaya ◽  
A. D. Grishina ◽  
N. I. Kuznetsova ◽  
L. Ya. Pereshivko ◽  
T. V. Krivenko ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Vinylidene Fluoride ◽  
Second Harmonic ◽  
Donor Acceptor ◽  
Acceptor Molecules

A new method of assessing the efficiency of second harmonic generation by small samples of organic crystals

1988 ◽  
Vol 47 (1) ◽  
pp. 83-86 ◽  
Author(s):  
R. T. Bailey ◽  
S. Blaney ◽  
F. R. Cruickshank ◽  
S. M. G. Guthrie ◽  
D. Pugh ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
New Method ◽  
Small Samples ◽  
Organic Crystals
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