Improved second-harmonic generation from Langmuir-Blodgett films

被引：10

作者：

Ashwell, GJ ^{[1
]}

Walker, TW

Leeson, P

Grummt, UW

Lehmann, F

机构：

[1] Cranfield Inst Technol, Ctr Mol Elect, Cranfield MK43 0AL, Beds, England

[2] Univ Jena, Inst Phys Chem, D-07743 Jena, Germany

来源：

LANGMUIR | 1998年 / 14卷 / 07期

关键词：

D O I：

10.1021/la971316w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The second-harmonic intensity from alternate-layer Langmuir-Blodgett films of a coumarin dye, 4-[2-(7-diethylamino-2-oxo-2H-benzopyran-3-yl)ethenyl]-1 -octadecylquinolinium bromide, and an inert spacer, 1-octadecyl-4-methylquinolinium bromide, increases quadratically with the number of active layers. The optimum effective second-order susceptibility, albeit resonantly enhanced, is the highest to date for a thick alternate-layer film with chi(eff)((2)) = 190 +/- 30 pm V-1 at 1.064 mu m. The thickness and the real and imaginary components of the dielectric permittivity from the surface plasmon resonance at 532 nn are iota = 4.6 +/- 0.4 nm bilayer(-1), epsilon(r) = 2.4 +/- 0.2 and epsilon(i) = 0.8 +/- 0.2.

引用

页码：1525 / 1527

页数：3

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