Ultrafast polarization modulation with high-purity chiral quasi-BIC metasurfaces

Le résumé fourni par la source

Precise control of the polarization state of light on ultrafast time scales plays a key role in revealing the inherent chiral or anisotropic optical responses in various material systems, and it is crucial for applications that require complex polarization encoding.Here, we explore ultrafast polarization control enabled by silicon-based chiral bound state in the continuum (BIC) metasurfaces.By utilizing the intrinsic chiral mode, we achieve high-purity chiral reflection light (S 3 ∼ -0.92) and rapid modulation (∼0.4 ps) of polarization states through all-optical methods.Unlike traditional polarization modulation techniques, our approach leverages the unique advantages of slanted etching dielectric chiral BIC metasurfaces, which facilitate high-Q resonance and exhibit narrow linewidths.These advantages allow swift alterations in polarization states with minimal modulation energy consumption, which should help for greater control of light in integrated photonic applications.

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