Polydiacetylene as an all-optical picosecond switch

被引:1
|
作者
Abdeldayem, H [1 ]
Frazier, D [1 ]
Paley, MS [1 ]
机构
[1] NASA, George C Marshall Space Flight Ctr, Univ Space Res Assoc SD47, Huntsville, AL 35812 USA
来源
关键词
All-Optical switch; Z-scan; Polydiacetylene; thin film; organic; nonlinear optics; optical computing; Logic-gate;
D O I
10.1117/12.448255
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Polydiacetylene derivative of 2-methyl-4-nitroaniline (PDAMNA) shows a picosecond switching property, which illustrated a partial all-optical picosecond NAND logic gate. The switching phenomenon was demonstrated by waveguiding two collinear beams at 633 nm and 532 run through a hollow fiber of 50 mum diameter, coated from inside with a thin film of PDAMNA. A Z-scan investigations of a PDAMNA thin film on quartz substrate revealed that the switching effect was attributed to an excited state absorption in the systems. The studies also showed that the polymer suffers a photo-oxidation beyond an intensity level of 2.9x10(6) w/cm(2). The photo-oxidized film has different physical properties that are different from the original film before oxidation. The life time of both excited states before and after oxidation as well as their absorption coefficients were estimated by fitting a three level system model to the experimental results.
引用
收藏
页码:240 / 247
页数:8
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