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| Record-high near-band-edge optical nonlinearities and two-level model correction of poled polymers by spectroscopic electromodulation and ellipsometry | |
| 作者姓名： | Taili Liu Di Zhang Md Rashedul Huqe Wen Wang Juan Antonio Zapien Sai-Wing Tsang Jingdong Luo |
| 作者单位： | Shenzhen Research Institute;Department of Chemistry;Department of Materials Science and Engineering;Center of Super-Diamond and Advanced Films（COSDAF） |
| 基金项目： | supported by the Fundamental Research Project Funding from Shenzhen Science & Technology Innovation Committee (JCYJ20180507181718203);the National Natural Science Foundation of China (21975213);the Research Grants Council (RGC) of Hong Kong (11306320, 11303618, 11210218);the City University of Hong Kong (9610389, 9680263, 9610454);the Innovation and Technology Commission of Hong Kong (ITS/461/18)。 |
| 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 ofΔn andΔk up to 10-3 and 10-2 are found at an applied electric field of 2.0×105-3.0×105V/cm.The study of linear optical properties of poled films by spectroscopic ellipsometry shows large polinginduced 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 electrorefraction 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. |
| 关 键 词： | poled polymers ELECTROABSORPTION electro-optic effect second-order nonlinear susceptibilities |
Record-high near-band-edge optical nonlinearities and two-level model correction of poled polymers by spectroscopic electromodulation and ellipsometry |
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| 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),2022,65(3):584-593. | |
| Authors: | Liu Taili Zhang Di Huqe Md Rashedul Wang Wen Zapien Juan Antonio Tsang Sai-Wing Luo Jingdong |
| Institution: | 1.Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, China ;2.Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China ;3.Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China ;4.Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, China ; |
| Abstract: | Science China Chemistry - 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... |
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