All‐optical poling behavior in side‐chain azobenzene homopolymer

Abstract

PACS 42.65. Ky, 78.66.Qn All-optical poling of side-chain azobenzene homopolymers PCN2 and PCN6, phenoxy] x-methylene methacrylate) for x = 2 and 6, with different spacer lengths was experimentally investigated. Due to the low absorption of the samples at 532 nm, it was found that there is a nearly quadratic increase in second-harmonic generation (SHG) when the film thickness of the sample films increases from 4 µm to 100 µm. The time constant τ A of the fitted photoinduced SHG decay process shows that PCN2 and PCN6 have higher temporal stability than the typical guest-host DR1-PMMA system, and different methylene conjugation lengths give slightly different time constants for disorientation. The possible reason from the molecule structure is discussed in detail.

Self-reconstructing all-optical poling in polymer fibers

“…It results in a polar orientation of the molecules inside the material [6]. Studies on the dependence of the photo-induced SHG in azobenzene side-chain polymers revealed a quadratic increase of the SHG with film thickness [7][8][9]. However, under continuous illumination with the fundamental light, SHG decays on a few minute time scale, whereas with the use of a 100 μm thick film, the decay is quantitatively slowed down.…”

QSPR Study of the Absorption Maxima of Azobenzene Dyes

“…Azobenzenes have been widely used as synthetic dyes with colors ranging from red to blue. 2,3 In addition to dyeing feature, azobenzenes possess some interesting properties such as the reversible cis-trans photoisomerization about the azo bond when irradiated, [4][5][6] and nonlinear optical (NLO) effect 7,8 related to the donoracceptor azobenzenes. Thus, azobenzenes have attracted much attention as materials in the development of nonlinear optical and storage data devices.…”