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Incoherent UV/VIS lasers assisted surface relief grating formation

Xiao Wu, Thi Thanh Ngan Nguyen, Deyan Sun, Isabelle Ledoux-Rak, Chi Thanh Nguyen, Ngoc Diep Lai, Advanced Materials Research 560-561, 456-461 (2012)

Two effcient optical methods are demonstrated to improve the formation of surface relief grating (SRG). The SRG formation is realized by a two-beam interference technique (lambda = 532 nm) in an azobenzene side-chain copolymer. An incoherent UV beam (lambda = 355 nm) or an incoherent VIS beam (lambda = 532 nm), called assisting beam, was used to accelerate the photoisomerization process of the cis-form-trans-form cycle, resulting in an efficient formation of SRG. The dependence of the di ffraction efficiency and the relief depth of the SRGs on the polarizations of both assisting beams were investigated showing two di fferent assisting mechanisms.

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