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Strong Nonlinear Optical Response in the Visible Spectral Range with Epsilon-Near-Zero Organic Thin Films
- Title
- Strong Nonlinear Optical Response in the Visible Spectral Range with Epsilon-Near-Zero Organic Thin Films
- Authors
- Lee, Yeon Ui; Garoni, Eleonora; Kita, Hanayo; Kamada, Kenji; Woo, Byung Hoon; Jun, Young Chul; Chae, Sang Min; Kim, Hyo Jung; Lee, Kwang Jin; Yoon, Seokhyun; Choi, Eunyoung; Mathevet, Fabrice; Ozerov, Igor; Ribierre, Jean Charles; Wu, Jeong Weon; D'Aleo, Anthony
- Ewha Authors
- 우정원; 윤석현
- SCOPUS Author ID
- 우정원; 윤석현
- Issue Date
- 2018
- Journal Title
- ADVANCED OPTICAL MATERIALS
- ISSN
- 2195-1071
- Citation
- ADVANCED OPTICAL MATERIALS vol. 6, no. 14
- Keywords
- epsilon near zero (ENZ); molecular aggregates; optical Kerr nonlinearity; organic thin film
- Publisher
- WILEY-V C H VERLAG GMBH
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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.
- DOI
- 10.1002/adom.201701400
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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