Nonlocal meta-lens with Huygens’ bound states in the continuum

Jin Yao, Fangxing Lai, Yubin Fan, Yuhan Wang, Shih-Hsiu Huang, Borui Leng, Yao Liang, Rong Lin, Shufan Chen, Mu Ku Chen (), Pin Chieh Wu (), Shumin Xiao () and Din Ping Tsai ()
Additional contact information
Jin Yao: City University of Hong Kong
Fangxing Lai: Shenzhen Graduate School, Harbin Institute of Technology
Yubin Fan: City University of Hong Kong
Yuhan Wang: Shenzhen Graduate School, Harbin Institute of Technology
Shih-Hsiu Huang: National Cheng Kung University
Borui Leng: City University of Hong Kong
Yao Liang: City University of Hong Kong
Rong Lin: City University of Hong Kong
Shufan Chen: City University of Hong Kong
Mu Ku Chen: City University of Hong Kong
Pin Chieh Wu: National Cheng Kung University
Shumin Xiao: Shenzhen Graduate School, Harbin Institute of Technology
Din Ping Tsai: City University of Hong Kong

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Meta-lenses composed of artificial meta-atoms have stimulated substantial interest due to their compact and flexible wavefront shaping capabilities, outperforming bulk optical devices. The operating bandwidth is a critical factor determining the meta-lens’ performance across various wavelengths. Meta-lenses that operate in a narrowband manner relying on nonlocal effects can effectively reduce disturbance and crosstalk from non-resonant wavelengths, making them well-suitable for specialized applications such as nonlinear generation and augmented reality/virtual reality display. However, nonlocal meta-lenses require striking a balance between local phase manipulation and nonlocal resonance excitation, which involves trade-offs among factors like quality-factor, efficiency, manipulation dimensions, and footprint. In this work, we experimentally demonstrate the nonlocal meta-lens featuring Huygens’ bound states in the continuum (BICs) and its near-infrared imaging application. All-dielectric integrated-resonant unit is particularly optimized to efficiently induce both the quasi-BIC and generalized Kerker effect, while ensuring the rotation-angle robustness for generating geometric phase. The experimental results show that the single-layer nonlocal Huygens’ meta-lens possesses a high quality-factor of 104 and achieves a transmission polarization conversion efficiency of 55%, exceeding the theoretical limit of 25%. The wavelength-selective two-dimensional focusing and imaging are demonstrated as well. This work will pave the way for efficient nonlocal wavefront shaping and meta-devices.

Date: 2024
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DOI: 10.1038/s41467-024-50965-y

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