抄録
The formation of gratings in polymer liquid crystals (PLCs) containing phynylacetylene moieties was studied. To obtain high diffraction efficiency (η), we prepared a novel PLC containing an azobenzene group directly connected with a tolane moiety (3AT), which has large birefringence (Δn). It was found that the value of birefringence in 3AT was extremely high (Δn=0.39). When two s-polarized writing beams from an Ar^+ laser at 488 nm were interfered on the surface of the 3AT film in the glassy state, multiple diffraction beams immediately appeared, resulting from the grating formation. The value of η was relatively high (η=20%) even though the alignment change of mesogens was small.
