Publication Type |
Journal Article |
School or College |
College of Science |
Department |
Physics |
Creator |
Vardeny, Zeev Valentine; Gellermann, Werner |
Other Author |
Myer, R. K.; Shkunov, M.; Benner, R. E.; Lin, J.; Barton, T. J. |
Title |
Two-photon absorption measured in the presence of strong one-photon saturation in cumulene-containing polymer |
Date |
1997 |
Description |
The Z-scan technique is used to extract the real and imaginary third order nonlinear susceptibilities, Rex(3) and Imx(3), respectively. A series of Z scans were conducted at 590 nm (near one-photon resonance) on a cumulene-containing polymer, poly(p-phenylene-l,4-diphenyl-l,2,3-butatriene) or PPC3, prepared in solution. At very high peak focal point intensities two-photon absorption is seen superimposed on a one-photon saturation signature in open aperture Z scans. A negative real third-order nonlinear susceptibility is also observed in closed aperture Z scans. We describe a procedure to extract the desired third-order nonlinear susceptibilities by conducting Z scans at various peak focal point intensities and then fitting the results by adjusting Rex(3) and saturation intensity. Molecular second hyperpolarizability, is calculated to be (-1.4+2.2i)xl029 esu which is almost 40 times larger than that measured in a monomer equivalent, and scaling nonlinearly with chain length. Z scans were also conducted at 780 nm (below one-photon resonance) on PPC3 and also gives a molecular second hyperpolarizability that is greater than that seen in the monomer. The higher value of molecular second hyperpolarizability measured near one-photon resonance is attributed to the existence of a real state at the first transition in a two-photon process. The extent of the exciton wave function obtained from the saturation intensity, is 60 A , larger than a single repeat unit. |
Type |
Text |
Publisher |
International Society for Optical Engineering (SPIE) |
Volume |
3145 |
First Page |
483 |
Last Page |
494 |
DOI |
10.1117/12.279297 |
citatation_issn |
0277786X |
Subject |
Molecular second hyperpolarizability; One-photon saturation; Polymer solution; Chain length |
Subject LCSH |
Cumulenes; Cumulenes -- Optical properties |
Language |
eng |
Conference Title |
Optical Probes of Conjugated Polymers; Monday 28 July 1997; San Diego, CA, USA |
Bibliographic Citation |
Myer, R. K., Shkunov, M., Benner, R. E., Gellerman, W., Vardeny, Z. V., Lin, J., & Barton, T. J. (1997). Two-photon absorption measured in the presence of strong one-photon saturation in cumulene-containing polymer. SPIE, 3145, 483-94. |
Rights Management |
(c)Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.279297 |
Format Medium |
application/pdf |
Format Extent |
875,235 bytes |
Identifier |
ir-main,9871 |
ARK |
ark:/87278/s6ht36nk |
Setname |
ir_uspace |
ID |
704185 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6ht36nk |