Abstract
Fano resonance originating from the interaction of anti-phased and in-phased lattice collective resonances supported by a binary gold nanodisk array is investigated both numerically and experimentally. As the magnitude of particle radii in the two arrays approaches gradually, the factor of such resonance increases while the spectral contrast reduces. In the experiment, a high spectral contrast of 0.7 and a large factor of 14 could be achieved at the same time due to the excitation of the pure dipole resonance of each particle resulting from the weak near-field coupling. Optimal calculation gives rise to a higher factor of up to 85 and a corresponding spectral contrast of 0.86, which is very promising in refractive sensors. The sensitivity and the figure of merit are and 116, respectively.
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
Wenyu Zhao, Xiandong Leng, and Yongyuan Jiang
Opt. Express 23(5) 6858-6866 (2015)
Yuto Moritake, Yoshiaki Kanamori, and Kazuhiro Hane
Opt. Lett. 39(13) 4057-4060 (2014)
Dalius Seliuta, Gediminas Šlekas, Gintaras Valušis, and Žilvinas Kancleris
Opt. Lett. 44(4) 759-762 (2019)