典型文献
Record-high near-band-edge optical nonlinearities and two-level model correction of poled polymers by spectroscopic electromodulation and ellipsometry
文献摘要：
The determination of nonlinearities near the band edge of organic and polymeric electro-optic(EO)materials is important from the viewpoint of molecular nonlinear optics(NLO)and photonic device applications.Based on transmission-mode Stark effect electromodulation(EM)spectroscopy,we study the electric-field-induced changes in optical absorption and refraction of newly developed EO polymers from the visible to near-infrared(NIR)wavelengths and report record-high near-band-edge complex EO effects from poled thin films.Values of △n and △k up to 10-3 and 10-2 are found at an applied electric field of 2.0×105-3.0×105 V/cm.The study of linear optical properties of poled films by spectroscopic ellipsometry shows large poling-induced birefringence and a nearly two-fold increase in the extinction coefficients at the extraordinary polarization.Through the Kramers-Kronig analysis,we obtained the real and imaginary second-order nonlinear coefficients up to～3,500 and～5,600 pm/V,respectively,which are believed to be the highest NLO coefficients of poled polymers through the resonance enhancement.Our approach goes beyond the previous works,applicable only to several discrete wavelengths,to a full-spectral analysis with independent verification of slab waveguide measurements.By considering both the electroabsorption and elec-trorefraction effects,our study overcomes the limitation of the classic qualitative two-level model and provides a quantitative understanding of near-resonance optical nonlinearities of organic EO materials.It can inspire the exploration of high-speed,absorptive,or phase-shifting light-modulators using EO polymers for on-chip applications.
文献关键词：
中图分类号：
作者姓名：
Taili Liu;Di Zhang;Md Rashedul Huqe;Wen Wang;Juan Antonio Zapien;Sai-Wing Tsang;Jingdong Luo
作者机构：
Shenzhen Research Institute,City University of Hong Kong,Shenzhen 518057,China;Department of Chemistry,City University of Hong Kong,Hong Kong SAR,China;Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong SAR,China;Center of Super-Diamond and Advanced Films(COSDAF),City University of Hong Kong,Hong Kong SAR,China
文献出处：
引用格式：
[1]Taili Liu;Di Zhang;Md Rashedul Huqe;Wen Wang;Juan Antonio Zapien;Sai-Wing Tsang;Jingdong Luo-.Record-high near-band-edge optical nonlinearities and two-level model correction of poled polymers by spectroscopic electromodulation and ellipsometry)[J].中国科学:化学（英文版）,2022(03):584-593
A类：
electromodulation,electroabsorption,trorefraction
B类：
Record,band,edge,optical,nonlinearities,two,level,model,correction,poled,polymers,by,spectroscopic,ellipsometry,determination,organic,polymeric,EO,materials,important,from,viewpoint,molecular,optics,NLO,photonic,device,applications,Based,transmission,Stark,EM,spectroscopy,we,study,electric,field,induced,changes,newly,developed,visible,infrared,NIR,wavelengths,report,record,complex,effects,thin,films,Values,up,found,applied,properties,shows,large,poling,birefringence,nearly,fold,increase,extinction,coefficients,extraordinary,polarization,Through,Kramers,Kronig,analysis,obtained,real,imaginary,second,order,pm,respectively,which,believed,highest,through,resonance,enhancement,Our,approach,goes,beyond,previous,works,applicable,only,several,discrete,full,spectral,independent,verification,slab,waveguide,measurements,By,considering,both,our,overcomes,limitation,classic,qualitative,provides,quantitative,understanding,It,can,inspire,exploration,speed,absorptive,phase,shifting,light,modulators,using,chip
AB值：
0.554486
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