Third-order nonlinear optical properties of finite bridged polymers

✍ Scribed by Xu Monica Wu; Mary Jo Ondrechen

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 476 KB
• Volume: 205
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85171-j

✦ Synopsis

The thirdarder microscopic hyperpolarizability y is calculated for finite bridged polymers of the form A-B-A-B-... using simple model Hamiltonians. Generally, the even-and odd-numbered chains show markedly different behavior, with the addition or subtraction of one chain unit resulting in a predicted change in 1 y 1 by a factor of up to a few orders of magnitude. The corresponding contribution to the elcctrochromic effect was found to be a sharply increasing function of the chain length 1 yI also is predicted to be significantly enhanced when the coupled A and B electronic states are off-resonant and when the total number of electrons is odd. When the total number of electrons is even, 1 y 1 may be maximized by adjustment of the A-B energy gap.