Mr. Ruizhe Hu Profile

Ruizhe Hu

at Beijing Univ of Posts and Telecommunications

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Proceedings Article | 28 November 2023 Poster + Paper

Chiral metasurface sensors based on bound states in the continuum

Ruizhe Hu, Ziang Gao, Tonggang Zhao

Proceedings Volume 12773, 127731B (2023) https://doi.org/10.1117/12.2688126

KEYWORDS: Sensors, Polarized light, Polarization, Optical transmission, Chiral materials, Reflection, Photonic crystals, Optical limiting, Numerical simulations, Nanophotonics

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Resonant modes with BIC effects can be produced and isolated from other radiation modes in the spectrum by using particular geometrical forms and material properties, as well as by breaking inversion and rotational symmetries in metasurfaces. The Q-factor of metasurfaces is considerably increased by this decoupling process, permitting effective optical responses over a limited frequency range. Optical chirality is the asymmetry that optical systems or materials exhibit when interacting with circularly polarized light. As light travels through chiral materials or structures, its rotation direction may change or it may encounter selective transmission, reflection, or absorption, resulting in differences between lefthanded and right-handed circularly polarized light. In our research, we developed all-dielectric metasurfaces that concurrently violate rotational and planar mirror symmetry, resulting in strong chirality and high-Q quasi-BIC resonances, which shows high circular dichroism (CD) of 0.954. Through numerical simulations, the effectiveness of this design was confirmed, highlighting the major benefits of chiral metasurfaces in selective transmission and polarization conversion. The outcomes of our work, in contrast to methods based on accidental BICs, have engineering tunability, making them useful for chiral biosensing, circular dichroism nonlinear optical systems, and other applications.

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