Abstract

The spectral dependence of the third-order nonlinear susceptibility χ⁽³⁾ (ω; ω, −ω, ω) of the polydiacetylene 9-BCMU has been measured, and the imaginary component is found to change sign in the exciton absorption tail. In the red-phase material, a significant refractive nonlinearity was observed around the 1.93-eV input energy range, whereas the absorption change was too small to quantify. A magnitude for the nonlinear refractive index coefficient |n₂| = 1.9 (±1.0) × 10⁻¹⁰ cm² W⁻¹ was measured at this Im χ⁽³⁾ = 0 position, indicating good figures of merit for all-optical switching.

© 1993 Optical Society of America

Relaxation dynamics of photoexcitations in polydiacetylenes and polythiophene

Takayoshi Kobayashi, Masayuki Yoshizawa, Uwe Stamm, Makoto Taiji, and Masamitsu Hasegawa
J. Opt. Soc. Am. B 7(8) 1558-1578 (1990)

Near-resonant third-order optical nonlinearities in p-toluene sulfonate polydiacetylene

J. Bolger, T. G. Harvey, Wei Ji, A. K. Kar, S. Molyneux, B. S. Wherrett, D. Bloor, and P. Norman
J. Opt. Soc. Am. B 9(9) 1552-1557 (1992)

Determining the dispersions of the fifth- and seventh-order nonlinear optical susceptibilities of a poly(4-BCMU) film through electroabsorption spectroscopy

Ke Yang, Jayant Kumar, Dong-Chan Lee, Daniel J. Sandman, and Sukant Tripathy
Opt. Lett. 25(16) 1186-1188 (2000)

Excited-state nonlinearity in polythiophene thin films investigated by the Z-scan technique

Lina Yang, R. Dorsinville, Q. Z. Wang, P. X. Ye, R. R. Alfano, R. Zamboni, and C. Taliani
Opt. Lett. 17(5) 323-325 (1992)

Optical absorption and scattering losses of PTS and poly(4-BCMU) thin-film waveguides in the near infrared

W. Krug, E. Miao, M. Derstine, and J. Valera
J. Opt. Soc. Am. B 6(4) 726-732 (1989)