Abstract

The optical chirality of a bilayer twisted tetramer nanostructure is investigated theoretically. The difference of transmission spectra under left- and right-handed circularly polarized extinction produces very large optical chirality of 91% due to the different plasmonic hybridization patterns between the nanorods. This structure also allows the generation of a perfectly right/left-handed system at certain modes, because this mode nearly vanishes under the illumination of the left/right-handed light. Moreover, tunable optical chirality is achieved, which is also found to be easily affected by geometric parameters such as the separation distance between the two layers, the length of the nanorod, and the arrangement of nanorods. We consider the charge vibrations of four nanorods at the same layer as an equivalent dipole and explain the dependence of the circular dichroic spectrum on the geometric parameters. This work suggests that the bilayer twisted tetramer nanostructure can be considered a potential candidate for achieving large optical chirality, applicable to the fields of polarization polarizer fabrication and biological detection.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Giant circular dichroism induced by tunable resonance in twisted Z-shaped nanostructure

Yu Qu, Lishun Huang, Li Wang, and Zhongyue Zhang
Opt. Express 25(5) 5480-5487 (2017)

Enhanced circular dichroism of crossed nanorods with nanowire

Mingyan Wang, Fei Wang, Yu Qu, Tiankun Wang, Yuyan Chen, Yu Bai, and Zhongyue Zhang
Appl. Opt. 57(23) 6721-6724 (2018)

Circular dichroism effect in a double-layer dolmen array nanostructure

Youyao Liu and Xiaoshan Yu
Appl. Opt. 56(22) 6263-6266 (2017)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription