Strong Nonlinear Optical Response in the Visible Spectral Range with Epsilon-Near-Zero Organic Thin Films
- 주제(키워드) epsilon near zero (ENZ) , molecular aggregates , optical Kerr nonlinearity , organic thin film
- 주제(기타) Materials Science, Multidisciplinary; Optics
- 설명문(일반) [Lee, Yeon Ui; Lee, Kwang Jin; Yoon, Seokhyun; Choi, Eunyoung; Wu, Jeong Weon; D'Aleo, Anthony] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Garoni, Eleonora] Univ Milan, Dipartimento Chim, Via Golgi 19, I-20133 Milan, Italy; [Garoni, Eleonora; Kita, Hanayo; Kamada, Kenji] Natl Inst Adv Ind Sci & Technol, IFMRI, Ikeda, Osaka 5638577, Japan; [Kita, Hanayo; Kamada, Kenji] Kwansei Gakuin Univ, Sch Sci & Technol, Dept Chem, Sanda, Hyogo 6691337, Japan; [Woo, Byung Hoon; Jun, Young Chul] Ulsan Natl Inst Sci & Technol, Dept Mat Sci & Engn, 50 UNIST Gil, Ulsan 44919, South Korea; [Chae, Sang Min; Kim, Hyo Jung] Pusan Natl Univ, Dept Organ Mat Sci & Engn, Pusan 609735, South Korea; [Mathevet, Fabrice] UPMC Univ Paris 06, Sorbonne Univ, CNRS, Inst Parisien Chim Mol,UMR Chim Polymeres 8232, Paris, France; [Ozerov, Igor; D'Aleo, Anthony] Aix Marseille Univ, CNRS, CINaM, UMR 7325, Campus Luminy,Case 913, F-13288 Marseille, France; [Ribierre, Jean Charles] Zheijiang Univ, Coll Opt Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China; [Wu, Jeong Weon; D'Aleo, Anthony] Inst for Basic Sci Korea, Ctr Quantum Nanosci, Seoul 03760, South Korea; [Wu, Jeong Weon; D'Aleo, Anthony] CNRS, UMI 2002, Joint CNRS Ewha Yonsei Lab, Bldg Blocks Future Elect Lab FUEL 2B, Seoul 03760, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 WILEY-V C H VERLAG GMBH
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000159985
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/adom.201701400
초록/요약
Enhanced Kerr nonlinearities are observed in metamaterials such as conducting oxides and doped inorganic semiconductor thin films showing epsilon-near-zero (ENZ) response in the infrared region. However, to achieve ENZ in the visible, artificial metamaterials with more complex nanostructures have to be specifically designed. Here, using sodium [5,6-dichloro-2-[[5,6-dichloro-1-ethyl-3-(4-sulphobutyl)-benzimidazol-2-ylidene]-propenyl]-1-ethyl-3-(4-sulphobutyl)-benzimidazolium hydroxide] and [2,4-bis[8-hydroxy-1,1,7,7-tetramethyljulolidin-9-yl]squaraine] organic thin films, ENZ responses between 450 and 620 nm are demonstrated. Both nonlinear refractive index and nonlinear absorption coefficient are enhanced by more than two orders of magnitude in the ENZ spectral region. These optical effects in the visible spectral range come from the strongly dispersive permittivity of molecular aggregates resulting from the coupling of excitonic transition dipoles. These findings open the path toward a next generation of high-performance solution-processable organic nonlinear optical materials with ENZ properties that can be tuned by molecular engineering.
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