Natural Hyperbolic Dispersion with Anisotropic Epsilon-Near-Zero and Epsilon-Near-Pole in Squaraine Molecular Film
- 주제(키워드) epsilon-near-pole , epsilon-near-zero , hyperbolic dispersion , polymethine dye
- 주제(기타) Materials Science, Multidisciplinary; Optics
- 설명문(일반) [Kim, Minjae; Choi, Kyu Ri; Wu, Jeong Weon; Placide, Virginie] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Lee, Yeon Ui] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, Chungbuk, South Korea; [Heinrich, Benoit; D'Aleo, Anthony] Univ Strasbourg, CNRS, IPCMS, UMR 7504, 23 Rue Loess, F-67034 Strasbourg, France; [Ko, Soo Young] Ewha Womans Univ, Dept Chem, Seoul 03760, South Korea; [Mathevet, Fabrice] Sorbonne Univ, Inst Parisien Chim Mol IPCM, Chim Polymeres, UMR 8232,Fac Sci,CNRS, 4 Pl Jussieu, F-75005 Paris, France; [Mathevet, Fabrice; Ribierre, Jean-Charles] Kyushu Univ, Ctr Organ Photon & Elect Res, Fukuoka, Fukuoka 8190395, Japan
- 등재 SCIE, SCOPUS
- OA유형 Green Submitted
- 발행기관 WILEY-V C H VERLAG GMBH
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000183772
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/adom.202101091
초록/요약
Epsilon-near-zero (ENZ) optical material has been employed in a number of novel linear and nonlinear optical applications, owing to the vanishing polarization upon an incident optical wave. In a uniaxial medium possessing hyperbolic energy-momentum dispersion of optical wave, ENZ can take place at ordinary and extraordinary permittivities. Organic thin films presenting a lamellar structure have been reported to exhibit a transverse negative hyperbolic dispersion with ENZ at ordinary permittivity. Here, organic thin film with ENZ at extraordinary permittivity is demonstrated. Newly synthesized polymethine dye (i.e., squaraine indolenine triethyleneglycol molecule) self-organizes to form a layered structure in a pristine film, and both transverse negative and positive hyperbolic dispersions are observed at visible wavelengths. Analysis of tens-nanometer-thick pristine film shows that both ENZ and epsilon-near-pole (ENP) occur at longitudinal as well as transverse component of dielectric permittivity. Optical characterization of squaraine pristine film is presented, and the importance of transverse positive hyperbolic dispersion in such monolithic thin film is discussed.
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