Chinese Physics B, Volume. 29, Issue 10, (2020)
Enhanced reflection chiroptical effect of planar anisotropic chiral metamaterials placed on the interface of two media
The strong chiroptical effect is highly desirable and has a wide range of applications in biosensing, chiral catalysis, polarization tuning, and chiral photo detection. In this work, we find a simple method to enhance the reflection circular dichroism (CDR) by placing the planar anisotropic chiral metamaterials (i.e., Z-shaped PACMs) on the interface of two media (i.e., Z-PCMI) with a large refractive index difference. The maximum reflection CDR from the complex system can reach about 0.840 when the refractive index is set as ntop = 4.0 and nbottom = 1.49, which is approximately three times larger than that of placing the Z-shaped PACMs directly on the substrate (i.e., Z-PCMS). While the minimum reflection CDR is 0.157 when the refractive index is set as nbottom = 1.49. So we can get a large available range of reflection CDR from –0.840 to –0.157. Meanwhile, the transmission CDT remains unchanged with the refractive index ntop increment. Our in-depth research indicates that the large reflection CDR is derived from the difference of non-conversion components of the planar anisotropic chiral metamaterials’ reflection matrices. In short, we provide a simple and practical method to enhance the chiroptical effect by changing the refractive index difference between two media without having to design a complex chiral structure.
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Xiu Yang, Tao Wei, Feiliang Chen, Fuhua Gao, Jinglei Du, Yidong Hou. Enhanced reflection chiroptical effect of planar anisotropic chiral metamaterials placed on the interface of two media[J]. Chinese Physics B, 2020, 29(10):
Received: Apr. 6, 2020
Accepted: --
Published Online: Apr. 21, 2021
The Author Email: Du Jinglei (houyd@scu.edu.cn)