Dual-Band Negative-Index Materials with Sandwich Configuration

• Published in: Chinese physics letters Vol. 27; no. 3; pp. 136 - 139
• Main Author: 王旭东 叶永红 郑超
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.03.2010
• Subjects: Arrays; Bands; Computer simulation; Dipoles; Dispersions; Interlayers; Plasmons; Quadrupoles; 三明治结构; 交叉偶极子; 双波段; 最高人民检察院; 许可证; 负折射率材料; 负指数; 金属模型
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/3/034103

Dual-band negative-index properties of the silver-SU-8-silver sandwich configuration, perforated with a square array of cross dipole apertures, are simulated and analyzed in the midinfrared region. The first and the second negative-index bands correspond to the （1,0） and （1,1） internal surface plasmon polariton （SPP） modes, respectively. The internal and external SPP modes acquired by the SPP dispersion relation of the metal/dielectric/metal model match well with the simulated transmission peaks. The effective parameters for the two negative-index bands are retrieved using simulated S parameters. The coupling effect between the （1,1） internal SPP mode and the localized resonance mode can be tuned by the arm length of cross dipole, which can weaken or destroy the negative electromagnetic response of the second negative-index band. The electric quadrupole mode of the second negative-index band accounts for its strong dependence on the dielectric loss of the interlayer.