Observation of three resonances in the third harmonic generation spectrum of conjugated polymers: Evidence for the four-level essential states model

S. Mazumdar, Fangyeong Guo

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Much of the theoretical effort to understand the mechanism of optical nonlinearity in π-conjugated polymers has been focused towards explaining the early observation of only two resonances in the third harmonic generation spectrum of trans-polyacetylene. A recent theory of third order optical nonlinearity predicts three, instead of two, resonances, with their intensities decreasing with increasing frequencies. This is a fundamental difference between the band and the exciton pictures of π-conjugated polymers. Very recent experimental results obtained with cis-polyacetylene, as well as earlier experiments on two blue forms of polydiacetylenes, are in complete agreement with this prediction. An isolated single strand of cis-polyacetylene should exhibit exciton behavior. We briefly discuss the latest experimental results for trans-polyacetylene.

Original languageEnglish
Pages (from-to)1665-1672
Number of pages8
JournalThe Journal of Chemical Physics
Volume100
Issue number2
DOIs
Publication statusPublished - 1994 Jan 1

Fingerprint

Polyacetylenes
polyacetylene
Conjugated polymers
Harmonic generation
harmonic generations
polymers
nonlinearity
excitons
strands
predictions
Experiments

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

@article{d10f6baaa44843bbb9f2424fab4a91ab,
title = "Observation of three resonances in the third harmonic generation spectrum of conjugated polymers: Evidence for the four-level essential states model",
abstract = "Much of the theoretical effort to understand the mechanism of optical nonlinearity in π-conjugated polymers has been focused towards explaining the early observation of only two resonances in the third harmonic generation spectrum of trans-polyacetylene. A recent theory of third order optical nonlinearity predicts three, instead of two, resonances, with their intensities decreasing with increasing frequencies. This is a fundamental difference between the band and the exciton pictures of π-conjugated polymers. Very recent experimental results obtained with cis-polyacetylene, as well as earlier experiments on two blue forms of polydiacetylenes, are in complete agreement with this prediction. An isolated single strand of cis-polyacetylene should exhibit exciton behavior. We briefly discuss the latest experimental results for trans-polyacetylene.",
author = "S. Mazumdar and Fangyeong Guo",
year = "1994",
month = "1",
day = "1",
doi = "10.1063/1.466594",
language = "English",
volume = "100",
pages = "1665--1672",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "2",

}

TY - JOUR

T1 - Observation of three resonances in the third harmonic generation spectrum of conjugated polymers

T2 - Evidence for the four-level essential states model

AU - Mazumdar, S.

AU - Guo, Fangyeong

PY - 1994/1/1

Y1 - 1994/1/1

N2 - Much of the theoretical effort to understand the mechanism of optical nonlinearity in π-conjugated polymers has been focused towards explaining the early observation of only two resonances in the third harmonic generation spectrum of trans-polyacetylene. A recent theory of third order optical nonlinearity predicts three, instead of two, resonances, with their intensities decreasing with increasing frequencies. This is a fundamental difference between the band and the exciton pictures of π-conjugated polymers. Very recent experimental results obtained with cis-polyacetylene, as well as earlier experiments on two blue forms of polydiacetylenes, are in complete agreement with this prediction. An isolated single strand of cis-polyacetylene should exhibit exciton behavior. We briefly discuss the latest experimental results for trans-polyacetylene.

AB - Much of the theoretical effort to understand the mechanism of optical nonlinearity in π-conjugated polymers has been focused towards explaining the early observation of only two resonances in the third harmonic generation spectrum of trans-polyacetylene. A recent theory of third order optical nonlinearity predicts three, instead of two, resonances, with their intensities decreasing with increasing frequencies. This is a fundamental difference between the band and the exciton pictures of π-conjugated polymers. Very recent experimental results obtained with cis-polyacetylene, as well as earlier experiments on two blue forms of polydiacetylenes, are in complete agreement with this prediction. An isolated single strand of cis-polyacetylene should exhibit exciton behavior. We briefly discuss the latest experimental results for trans-polyacetylene.

UR - http://www.scopus.com/inward/record.url?scp=0000557340&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000557340&partnerID=8YFLogxK

U2 - 10.1063/1.466594

DO - 10.1063/1.466594

M3 - Article

AN - SCOPUS:0000557340

VL - 100

SP - 1665

EP - 1672

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 2

ER -