TY - JOUR
T1 - Chiral Metasurfaces
T2 - A Review of the Fundamentals and Research Advances
AU - Asefa, Semere Araya
AU - Shim, Sangmin
AU - Seong, Myeongsu
AU - Lee, Dasol
N1 - Funding Information:
D.L. acknowledges the National Research Foundation of Korea (NRF) grant (NRF-2022R1F1A1065453) funded by the Ministry of Science and ICT (MSIT) and Regional Innovation Strategy (RIS) through the NRF funded by the Ministry of Education (MOE) in 2023 (2022RIS-005) of Korean government. M.S. acknowledges the support from the Natural Science Foundation of Jiangsu Province (BK20220603).
Publisher Copyright:
© 2023 by the authors.
PY - 2023/10
Y1 - 2023/10
N2 - Chirality, the absence of mirror symmetry, is predominant in nature. The chiral nature of the electromagnetic field behaves differently with chiral matter for left circularly polarized and right circularly polarized light. The chiroptical behavior in the sensing of naturally occurring chiral objects is weak, and improving the chiroptical response enhances the chiral sensing platform. This review covers the fundamental concepts of chiral metasurfaces and various types of single- and multi-layered chiral metasurfaces. In addition, we discuss tunable and deep-learning-based chiral metasurfaces. Tunability is achieved by manipulating the meta-atom’s property in response to external stimuli for applications such as optical modulation, chiral photonics, advanced sensing, and adaptive optics. Deep-learning modeling techniques, such as CNNs and GANs, offer efficient learning of the complex relationships in data, enabling the optimization and accurate prediction of chiral metasurface properties. The challenges in the design and fabrication of chiral metasurface include achieving broadband performance and scalability and addressing material limitations. Chiral metasurface performance is evaluated by optical rotation, circular dichroism enhancement, and tunability, which are quantified through the spectroscopic measurement of circular dichroism and optical rotation. Chiral metasurface progress enables applications, including metaholography, metalenses, and chiral sensing. Chiral sensing improves the detection of pharmaceuticals and biomolecules, increasing the sensitivity and accuracy of analytical diagnostics.
AB - Chirality, the absence of mirror symmetry, is predominant in nature. The chiral nature of the electromagnetic field behaves differently with chiral matter for left circularly polarized and right circularly polarized light. The chiroptical behavior in the sensing of naturally occurring chiral objects is weak, and improving the chiroptical response enhances the chiral sensing platform. This review covers the fundamental concepts of chiral metasurfaces and various types of single- and multi-layered chiral metasurfaces. In addition, we discuss tunable and deep-learning-based chiral metasurfaces. Tunability is achieved by manipulating the meta-atom’s property in response to external stimuli for applications such as optical modulation, chiral photonics, advanced sensing, and adaptive optics. Deep-learning modeling techniques, such as CNNs and GANs, offer efficient learning of the complex relationships in data, enabling the optimization and accurate prediction of chiral metasurface properties. The challenges in the design and fabrication of chiral metasurface include achieving broadband performance and scalability and addressing material limitations. Chiral metasurface performance is evaluated by optical rotation, circular dichroism enhancement, and tunability, which are quantified through the spectroscopic measurement of circular dichroism and optical rotation. Chiral metasurface progress enables applications, including metaholography, metalenses, and chiral sensing. Chiral sensing improves the detection of pharmaceuticals and biomolecules, increasing the sensitivity and accuracy of analytical diagnostics.
KW - chiral metasurface
KW - chiral sensing
KW - chiroptical response
KW - circular dichroism (CD)
KW - deep learning
KW - enantiomers
KW - multi-layered chiral metasurface
KW - reconfigurable chiral metasurface
KW - single-layered chiral metasurface
KW - tunable chiral metasurface
UR - http://www.scopus.com/inward/record.url?scp=85174163851&partnerID=8YFLogxK
U2 - 10.3390/app131910590
DO - 10.3390/app131910590
M3 - Review article
AN - SCOPUS:85174163851
SN - 2076-3417
VL - 13
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
IS - 19
M1 - 10590
ER -