کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7129042 | 1461597 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Twistacene contained molecule for optical nonlinearity: Excited-state based negative refraction and optical limiting
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Twistacene contained molecule for optical nonlinearity: Excited-state based negative refraction and optical limiting Twistacene contained molecule for optical nonlinearity: Excited-state based negative refraction and optical limiting](/preview/png/7129042.png)
چکیده انگلیسی
Spindle-type molecules containing twisted acenes (PyBTA-1 & PyBTA-2) are designed, synthesized characterized. Picosecond Z-scan experiments under 532â¯nm show reverse saturable absorption and negative nonlinear refraction, indicating large third-order optical nonlinearity in PyBTA-1. The mechanism of the optical nonlinearity is investigated and the results show that the nonlinear absorption and refraction in PyBTA-1 originates from a charge transfer (CT) state. Furthermore, relatively long lifetime and absorptive cross section of the CT state are measured. Based on the excited state absorption in PyBTA-1, strong optical limiting with â¼0.3â¯J/cm2 thresholds are obtained when excited by picoseconds and nanoseconds pulses. The findings on nonlinear optics suggest PyBTA-1 a promising material of all optical modulation and laser protection, which enrich the potential applications of these spindle-type molecules. Comparing to the previously reported spindle-type molecules with analogous structures, the introduction of ICT in PyBTA-1 & PyBTA-2 dramatically decreases the two-photon absorption while enhances the nonlinear refraction. The results could be used to selectively tailor the optical nonlinearity in such kind of compounds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics & Laser Technology - Volume 102, June 2018, Pages 93-99
Journal: Optics & Laser Technology - Volume 102, June 2018, Pages 93-99
نویسندگان
Xingzhi Wu, Jinchong Xiao, Ru Sun, Jidong Jia, Junyi Yang, Guanghong Ao, Guang Shi, Yuxiao Wang, Xueru Zhang, Yinglin Song,