In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 39, No. 10R ( 2000-10-01), p. 5838-
Abstract:
The absorption and electroabsorption (EA) spectra of 1-methyl-1 ′ -octadecyl-2,2 ′ -cyanine perchlorate (S120) Langmuir-Blodgett films were measured. From these results, dispersion of the third-order nonlinear optical susceptibility χ (3) (-ω; 0,0,ω) in the range of 1.8 to 2.7 eV was determined. In addition, the linear-polarizability difference Δα and the permanent dipole-moment difference Δµ between excited and ground states were evaluated. Upon comparison with the results of measurement of the S120 monomer film, it was found that the third-order nonlinear optical susceptibility of the S120 LB film is strongly enhanced by a factor of 1000. It was concluded that this strong enhancement is attributed to the fact that S120 molecules with a short methyne chain that tightly binds two quinoline rings form a rigid J-aggregate with a one-dimensional structure that hardly twists, so as to yield a sharp absorption band with a large transition moment. Finally, we evaluated the average aggregation number of the S120 LB film to be 3–4.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.39.5838
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2000
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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