Numerical Study of Circular Dichroism Generated by Bilayered Split Rings

doi:10.19596/j.cnki.1001-246x.7870

Abstract

Abstract: Based on Jones matrix, we propose a metal nanostructure consisting of double-layer split rings, in which the opening direction between up and down split rings is twisted to break symmetry. CD effect of the nanostructure and mechanism is studied with finite element method. It shows that under excitation of left-handed circularly polarized light and right-handed circularly polarized light the structure shows different transmission. Its CD value reaches 0.34. Current density distributions show that at short resonant wavelengths equivalent dipoles of upper and bottom split-rings form antibonding mode, and at long resonant wavelengths equivalent dipoles of upper and bottom split-rings form bonding mode. These results facilitates understanding of physical mechanism of CD. It provides a way to design chiral nanostructure.

Key words: chirality, surface plasmon, finite element method, circular dichroism

CLC Number:

O433.5

WEN Xiaojing, QU Yu, CHEN Chengzhao. Numerical Study of Circular Dichroism Generated by Bilayered Split Rings[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(3): 357-362.

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