Dynamics of biphotonic intensity holographic gratings based on dye‐doped liquid crystal films

Abstract

The dynamics of biphotonic intensity holographic gratings (BIHGs) based on dye‐doped liquid crystal (DDLC) films, including optical and thermal effects, are studied. Experimental results indicate that the formation of a BIHG involves bulk reorientation and surface adsorption. The former yields a transient biphotonic grating; the latter results in a persistent biphotonic grating. Additionally, the dynamic behaviours of the biphotonic diffraction signals are different from those of a conventional one‐photonic diffraction signal, and depend on the intensity(polarization) of the green(red) pump‐beam. The effect of ambient temperature on the diffraction efficiency of a BIHG is also studied: a higher ambient temperature prevents more dye molecules from being adsorbed on the substrate.

Acknowledgement

The authors would like to thank the National Science Council (NSC) of the Republic of China (Taiwan) for financially supporting this research under contract no. NSC 94‐2112‐M‐006‐005.