Title of article
Observation of electric-dipole-forbidden states in polydiacetylene by means of second-harmonic generation spectroscopy
Author/Authors
Manaka، نويسنده , , T. and Yamada، نويسنده , , T. and Hoshi، نويسنده , , H. and Ishikawa، نويسنده , , K. and Takezoe، نويسنده , , H. and Fukuda، نويسنده , , A.، نويسنده ,
Issue Information
دوماهنامه با شماره پیاپی سال 1997
Pages
2
From page
963
To page
964
Abstract
We have observed second-harmonic generation (SHG) and third-harmonic generation (THG) spectra in polydiacetylene (PDA), poly[5,7-dodecadiyne-1,12-diyl-bis-ethylurethane], thin films. According to linear absorption and THG spectra in PDA, two dipole-allowed states, the lowest Bu exciton and the band edge, exist around 2.0 eV and 2.6 eV, respectively. Therefore, a resonant peak appearing around 2.35 eV in SHG and THG spectra is due to the dipole-forbidden Ag exciton state. Thus, the SHG spectroscopy serves as a powerful tool for investigating dipole-forbidden states as much as THG spectroscopy.
Keywords
Non-linear optical methods , Laser spectroscopy , Other conjugated polymers
Journal title
Synthetic Metals
Serial Year
1997
Journal title
Synthetic Metals
Record number
2070812
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