Tunable circular conversion dichroism of single-layer twisted graphene-patterned metasurface

Zeng, Yali; Duan, Qilin; Xu, Jinying; Yang, Zhilin; Chen, Huanyang; Liu, Yineng

doi:10.1016/j.isci.2023.106115

Cited by 6 publications

(1 citation statement)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the dynamic tunability of chiral nanostructures can greatly promote their applications in switchable polarization conversion, real-time biological sensing, dynamic imaging, and other fields. Many researchers have achieved dynamic tuning of CD by introducing materials such as phase-change materials, , liquid crystals, , and graphene. , However, chiral micro- and nanostructures based on phase transitions exhibit relatively slow response rates. In contrast, those based on liquid crystals typically exhibit modulation speeds within the range of several hundred to several thousand Hz and are susceptible to environmental temperature fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Active Control and Sensing Application of Ultra-Narrowband Circular Dichroism in Multilayer Chiral Nanorod Arrays

Wang,

Peng,

Sun

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Narrowband circular dichroism (CD) has attracted wide attention for its high sensitivity in detecting chiral molecules and catalysis. However, designing a chiral metasurface with excellent sensing performance that can be dynamically tuned still poses challenges. This paper introduces lithium niobate, an electrically tunable material, and a distributed Bragg reflector into chiral nanorod structures to form multilayer chiral nanorod arrays (MCNAs). Simulation results show that MCNAs can generate four strong ultra-narrowband (UNB) CD signals in the visible light spectrum. The UNB CD signal intensity was up to 0.86, and the minimum full width at half-maximum (FWHM) was up to 0.21 nm. The surface electric field and current distribution of MCNAs indicate that the four UNB CD signals mainly originate from the x and y direction Tamm resonances in the chiral nanorod layer. The refractive index of lithium niobate can be tuned by changing the electric field, allowing the active tuning of UNB CD signals. In addition, the sensing performance of MCNAs in the SARS-CoV-2 solution was analyzed, and the figure of merit (FOM) can reach an astonishing 2092. These findings not only assist with the design of UNB chiral devices but also offer new possibilities for the environmental monitoring and ultrasensitive detection of chiral molecules.

show abstract