Abstract
Excited state lifetimes of C60/toluene solution and C60 films macromolecular were measured by pump-probe method. Relation between optical switching effect of material and pulse width of pumping field is briefly described. It is found that the faster switching speed of light is, the triplet state lifetime is shorter. A He-Ne laser, as a probe, passed through the sample in the pump-probe experiment. All-optical switching effect was realized. Changing the optical power of the pumping field, switching response of the sample and modulation depth were investigated. In certain experimental conditions, relation between transmission through the sample and response were measured by an oscilloscope. Triple state lifetime of the molecule is speculated. The result showed that C60/toluene solution and C60 film have a fast response time. They would be utilized in some applications, such as optical switches, photonic devices.
Highlights
The nonlinearities of C60 have been paid considerable attention for their promising use in the applications of photonic devices due to its unique opto-electronic properties, its reverse saturable absorption phenomenon was found by Guiliano and Hess [1]
We compared with functionalized fullerene solutions, scattering contributions to the observed limiting performance, and possible limiting in the near infrared region, we got a clear picture of optical switching properties of liquid C60/toluene solution and solid C60 thin films
The mechanism of optical switch of excited state absorption is that the molecules at excited states pumped by laser strongly absorbs photons at some wavelength, while the ground state absorption is very weak
Summary
The nonlinearities of C60 have been paid considerable attention for their promising use in the applications of photonic devices due to its unique opto-electronic properties, its reverse saturable absorption phenomenon was found by Guiliano and Hess [1]. The potential applications of RSA materials in optical limiting and switching have attracted more interests because of the growing needs for laser protection [2]. As an view of application, this makes C60 an interesting candidate for optical power limiting purposes [3,4,5,6,7]. We compared with functionalized fullerene solutions, scattering contributions to the observed limiting performance, and possible limiting in the near infrared region, we got a clear picture of optical switching properties of liquid C60/toluene solution and solid C60 thin films
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