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

Fangxing Lai; Yubin Fan; Xinbo Sha; Huachun Deng; Xiong Jiang; Shumin Xiao; Can Huang; Qinghai Song

doi:10.3788/COL202523.053605

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

Fangxing Lai
, Yubin Fan
, Xinbo Sha
, Huachun Deng
, Xiong Jiang
, Shumin Xiao
, Can Huang^*
, Qinghai Song^*

^*Corresponding author for this work

Department of Electrical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

5 Citations (Scopus)

Abstract

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 (S₃ ∼ -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.
© 2025 Chinese Optics Letters

Original language	English
Article number	053605
Journal	Chinese Optics Letters
Volume	23
Issue number	5
Online published	6 May 2025
DOIs	https://doi.org/10.3788/COL202523.053605
Publication status	Published - May 2025

Funding

This work was supported by the National Natural Science Foundation of China (Nos. 12025402, 12334016, 62305084, 6233000076, 12261131500, 92250302, and 11934012), the New Cornerstone Science Foundation through XPLORER PRIZE, Shenzhen Fundamental Research Project (Nos. JCYJ20210324120402006, JCYJ20230807094401004, GXWD2022081714551, and GXWD20220817145518001), the Fundamental Research Funds for the Central Universities (Nos. 2022FRRK030004 and HIT.OCEF.2024020), the Guangdong Basic and Applied Basic Research Foundation (No. 2023A1515011746), the Guangdong Provincial Quantum Science Strategic Initiative (No. GDZX2406002), the Shenzhen Science and Technology Program (No. JCYJ20230807094401004), and the Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems (No. 2023B1212010003). Q. S. conceived the idea and supervised the research. F. L., Y. F., X. S., H. D., X. J., C. H., and Q. S. conducted the design. F. L. and X. J. fabricated the samples. F. L., C. H., and Y. F. performed the experimental measurements. F. L., Q. S., and C. H. analyzed the results. All the authors discussed the content and prepared the manuscript.

Research Keywords

chiral bound states in the continuum
polarization control
slanted etching

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title = "Ultrafast polarization modulation with high-purity chiral quasi-BIC metasurfaces",

abstract = "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 (S3 ∼ -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. {\textcopyright} 2025 Chinese Optics Letters",

keywords = "chiral bound states in the continuum, polarization control, slanted etching",

author = "Fangxing Lai and Yubin Fan and Xinbo Sha and Huachun Deng and Xiong Jiang and Shumin Xiao and Can Huang and Qinghai Song",

year = "2025",

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T1 - Ultrafast polarization modulation with high-purity chiral quasi-BIC metasurfaces

AU - Lai, Fangxing

AU - Fan, Yubin

AU - Sha, Xinbo

AU - Deng, Huachun

AU - Jiang, Xiong

AU - Xiao, Shumin

AU - Huang, Can

AU - Song, Qinghai

PY - 2025/5

Y1 - 2025/5

N2 - 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 (S3 ∼ -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. © 2025 Chinese Optics Letters

AB - 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 (S3 ∼ -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. © 2025 Chinese Optics Letters

KW - chiral bound states in the continuum

KW - polarization control

KW - slanted etching

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001492927300013

U2 - 10.3788/COL202523.053605

DO - 10.3788/COL202523.053605

M3 - RGC 21 - Publication in refereed journal

SN - 1671-7694

VL - 23

JO - Chinese Optics Letters

JF - Chinese Optics Letters

IS - 5

M1 - 053605

ER -

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

Abstract

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Research Keywords

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