Femtosecond excited-state dynamics and optical bistability in three forms of polyaniline

Hui Z. Wang; Wenguang Lan; Weizhu Lin

doi:10.1117/12.253241

30 September 1996 Femtosecond excited-state dynamics and optical bistability in three forms of polyaniline

Hui Z. Wang, Wenguang Lan, Weizhu Lin

Proceedings Volume 2896, Photorefractive Materials; (1996) https://doi.org/10.1117/12.253241
Event: Photonics China '96, 1996, Beijing, China

Abstract

Photoexcitation and relaxation dynamics of photoinduced defects in the emeraldine base (EB) form of polyaniline, poly (m-aniline) (PMAn) and the emeraldine salt (ES) form of polyaniline embedded in polymethylmathacrylate (PMMA) has been measured using femtosecond time-resolved absorption saturation technology. The relaxation of photoexcitation, observed in EB, consists of two components: an initial ultrafast relaxation (approximately 100 fs) and a following slow relaxation (approximately 30 ps). A slower photoinduced bleaching compared with that in EB and 5-ps relaxation process were observed in PMAn. The ES/PMMA film exhibits the fastest ground recovery (approximately 0.5 ps) of photoexcitation, which is about two orders of magnitude faster than that of EB and an order of magnitude faster than that of PMAn. This ultrafast polaron relaxation in ES/PMMA was observed for the first time. Optical bistability and multistability were obtained by the simulation of the excitation and relaxation processes observed in the three forms of polyaniline. The switching time is strongly affected by the relaxation dynamics of the photoexcited defects.

Citation Download Citation

Hui Z. Wang, Wenguang Lan, and Weizhu Lin "Femtosecond excited-state dynamics and optical bistability in three forms of polyaniline", Proc. SPIE 2896, Photorefractive Materials, (30 September 1996); https://doi.org/10.1117/12.253241

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available