Circular dichroism property of conjugated gammadion meta-atom integrated on silicon waveguide

The circular dichroism (CD) performance of conjugated gammadion structure on the end facet of silicon waveguide in the mid-infrared regime is investigated theoretically. By engineering the orientation of the structure, the sign and value of its CD spectrum can be changed. For a fixed gammadion struc...

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Bibliographic Details
Published in:Applied physics express 2021-03, Vol.14 (3), p.32006
Main Authors: Lin, Chia-Yi, Chen, Yu-Yu, Lin, Pao Tai, Chang, Shih-Hui Gilbert
Format: Article
Language:English
Subjects:
chirality
circular dichroism
FDTD
metamaterials
optical activity
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Summary:The circular dichroism (CD) performance of conjugated gammadion structure on the end facet of silicon waveguide in the mid-infrared regime is investigated theoretically. By engineering the orientation of the structure, the sign and value of its CD spectrum can be changed. For a fixed gammadion structure, different CD values can be obtained not only by changing the excitation wavelength but the excitation waveguide mode. This finding potentially provides an extra degree of freedom to design integrated chiral photonics chips.
ISSN:1882-0778
1882-0786
DOI:10.35848/1882-0786/abdcd4