Pulse-width-dependent optical limiting properties of a novel twist-acene compound
Optical Materials(2023)
摘要
Organic materials with large nonlinear optical coefficient and ultrafast response speed have attracted considerable attention due to their potential applications in optical limiting (OL). However, it is a challenging obstacle to develop a candidate material with optimal nonlinear absorption response while avoiding undesirable low transmittance. Here, a novel symmetrical heteroacenes compound 4,4'-(buta-1,3-diyne-1,4-diylbis(2,7-di-tert-butyl-9,14-diphenyldibenzo[de,qr]tetracene-12,11-diyl))bis(N,N-diphenylaniline)(abbreviated as JPC-42) was synthesized and its nonlinear optical properties were investigated under different pulse-width excitation conditions at 532 nm. Results show that the compound with twisted structure displays superior optical limiting response in which extremely high transmittance (91% in 532 nm) and low OL threshold (3 × 10−3 J/cm2 in femtosecond regime, 130 × 10−3 J/cm2 in picosecond regime) are obtained. Our results demonstrate that this twist-acene compound is a promising candidate in laser protection fields.
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关键词
Optical limiting,Twist acene,Two-photon absorption,Excited-state absorption
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