Ultrafast nonresonant third-order optical nonlinearity of fullerene-containing polyurethane films at telecommunication wavelengths

Qiying Chen, W.L.; Li Kuang, W.L.; Sargent, Edward H.; Zhi Yuan Wang
September 2003
Applied Physics Letters;9/15/2003, Vol. 83 Issue 11, p2115
Academic Journal
High-optical-quality polyurethane films containing a high load of (60)fullerene (C[sub 60]) were prepared by reaction of the hydroxy-containing C[sub 60] and triisocyanate with the goal of obtaining enhanced nonresonant third-order optical nonlinearity. Optical nonlinearity was measured using the Z-scan technique in the wavelength range 1150–1600 nm. This revealed a positive Kerr coefficient with nonresonant n[sub 2] equal to 2.0(±0.6)×10[sup -3] cm[sup 2]/GW and excellent linear-absorption and nonlinear-absorption figures of merit at 1550 nm. The technique reported herein is a new approach to obtain fullerene films with the capacity to realize a high number density of C[sub 60] moieties. These resulted in more than 2 orders of enhancement in the third-order susceptibility over recently reported C[sub 60] sol and gel, and an enlarged second-order hyperpolarizability resulting from further enhanced charge transfer processes. © 2003 American Institute of Physics.


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