Bilayer four-fold rotationally symmetric subwavelength nanostructures for chirality switching

Yew Li Hor; Eng Huat Khoo

doi:10.1117/12.2060611

12 September 2014 Bilayer four-fold rotationally symmetric subwavelength nanostructures for chirality switching

Yew Li Hor, Eng Huat Khoo

Proceedings Volume 9160, Metamaterials: Fundamentals and Applications 2014; 91601Q (2014) https://doi.org/10.1117/12.2060611
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

Chirality effect has been reported from the interaction of light with chiral plasmonic nanostructures. Such nanostructure enhances the chirality response of the chiral molecules and provides a good platform for biochemical sensing. The ability to detect chiral molecules has been a long term goal of biologists and chemist because chirality is inherent in macromolecules such as proteins and DNA in human body. One of the challenging problems is manipulation of the CD spectrum. Here, we investigate the switchable chiral effects of subwavelength nanostructures array with the unit cell makes up of double-layered nanostrips in four-fold rotationally symmetric arrangement. The switchable chirality effect has observed in both plasmonic and Bloch modes when the mutual angle between the first layer and second layer rotates with respect to each other. The magnitude of chirality changes from positive to negative when the mutual angle rotates from 0^o to 90^o. In the order hand, the nanostructures change from right-handed to left-handed structures without altering the polarization of incident light, or vice versa, upon the mutual rotation angles. Thus, by manipulating the mutual rotation angle, the handedness of the nanostructure will switch and cause the reversal of the outgoing light.

Citation Download Citation

Yew Li Hor and Eng Huat Khoo "Bilayer four-fold rotationally symmetric subwavelength nanostructures for chirality switching", Proc. SPIE 9160, Metamaterials: Fundamentals and Applications 2014, 91601Q (12 September 2014); https://doi.org/10.1117/12.2060611

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