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Abstract
A bifluorenylidene derivative with extended π-conjugated system has been designed and successfully synthesized. The compound displays strong three-photon absorption effect. The obtained three-photon absorption cross section is as high as 81.3 × 10(-76) cm(6)s(2). Distinguished 3PA-induced optical limiting and optical stabilization performances have been achieved. The on-axis transmitted intensity approached a constant even though the incident laser pulse fluctuation was 300%.
Highlights
Novel organic compounds featuring large three-photon absorption (3PA) cross section have been of particular interest since many attractive applications are based on its high-order nonlinearity of media’s response to the exciting light
Molecules with large 3PA cross section can be widely used in the fields of ultrahigh-resolution biological imaging [1,2,3], high-efficiency up-converted stimulated emission [4,5,6,7], optical limiting [8,9], biomedical [10], light-activated therapy field [11,12,13], three-dimensional optical data storage [14], microfabrication [15]
In multiphoton-absorption-induced optical stabilization, using materials with a larger 3PA cross section value will result in a better stabilization behavior. 3PA-induced optical stabilization has some salient features: (i) instantaneous response; (ii) high linear transmittance at low incident power and rapid attenuation at high incident power, which is based on the cubic dependence
Summary
Novel organic compounds featuring large three-photon absorption (3PA) cross section have been of particular interest since many attractive applications are based on its high-order nonlinearity of media’s response to the exciting light. Molecules with large 3PA cross section can be widely used in the fields of ultrahigh-resolution biological imaging (three-photon confocal microscopy) [1,2,3], high-efficiency up-converted stimulated emission [4,5,6,7], optical limiting [8,9], biomedical [10], light-activated therapy field [11,12,13], three-dimensional optical data storage [14], microfabrication [15]. The relatively small 3PA cross section values of present nonlinear molecules limit their practical applications.
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