Multi-channel vortex beam based on single layer transmission-type metal metasurface

Xin, Haoxuan; Feng, Guojin; Wang, Qingyu; Zheng, Zhengdiao; Tang, Ying; Ren, Kunpeng; Mao, Zelong; Li, Chenxia; Jin, Yongxing; Fang, Bo; Hong, Zhi; Jing, Xufeng

doi:10.1016/j.optlastec.2024.111094

Optics & Laser Technology

2024

DOI: 10.1016/j.optlastec.2024.111094

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Multi-channel vortex beam based on single layer transmission-type metal metasurface

Haoxuan Xin,

Guojin Feng,

Qingyu Wang

et al.

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Cited by 2 publications

References 69 publications

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Generating sub-diffraction microwave needle beam for nondestructive testing by multifunctional transmissive metasurfaces

Feng,

Shi,

Jiao

et al. 2024

Journal of Applied Physics

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Sub-diffraction needle beams with high intensity, sub-diffraction focal size, and long depth of focus (DOF) have attracted many researchers’ attention. However, the traditional methods for needle beam generation typically require many devices, such as phase elements, amplitude filters, and lens, which leads to a complex and bulky system and unfavorable for their integration. To address these challenges, we use a single multifunctional transmissive metasurface to convert a linearly polarized plane wave into a needle beam in the microwave range. The guided wave inspired unit cells of the proposed metasurface is designed to simultaneously and independently modulate the polarization and phase of transmitted waves. By imposing the desired polarization and phase distributions on the metasurface, the proposed multifunctional transmissive metasurface can efficiently generate a needle beam with subdiffraction size and extended DOF at 10 GHz when it is illuminated by an x-polarized wave. The proposed metasurface is fabricated, and a sub-diffraction needle beam with good performance is obtained in our measurements. In addition, a proof-of-concept of a high-resolution nondestructive testing experiment based on our designed metasurface is accomplished. Our work is expected to have potential applications in nondestructive testing of materials and structures.

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Generating sub-diffraction microwave needle beam for nondestructive testing by multifunctional transmissive metasurfaces

Feng,

Shi,

Jiao

et al. 2024

Journal of Applied Physics

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Reprogrammable metasurface holographic image encryption technology based on a three-dimensional discrete hyperchaotic system

Bi,

Zhang,

Zhang

et al. 2024

Opt. Express

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The emergence of metasurfaces provides a secure and efficient platform for optical encryption technology as they have broad prospects in the field of information security. However, the limited number of channels available on metasurfaces and the insufficient security of keys make them vulnerable to attacks by eavesdroppers. In this work, a reprogrammable metasurface optical encryption scheme based on a three-dimensional hyperchaotic system is proposed. The three-dimensional discrete hyperchaotic system has strong ergodicity, initial value sensitivity, and pseudorandomness compared to previous chaotic systems that can pass NIST randomness testing well. Additionally, based on this hyperchaotic property, we designed a metasurface encryption structure based on the geometric phase. The research results show that the introduction of the hyperchaotic system greatly improves the randomness and flexibility of key generation. This scheme can encrypt multiple images with high security. Decryption is only possible when the attacker steals the complete chaotic system and parameters, as well as over 70% of the correct incident light phase information. Our research results have great potential applications in the field of metasurface optical encryption.

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Multi-channel vortex beam based on single layer transmission-type metal metasurface

Cited by 2 publications

References 69 publications

Generating sub-diffraction microwave needle beam for nondestructive testing by multifunctional transmissive metasurfaces

Generating sub-diffraction microwave needle beam for nondestructive testing by multifunctional transmissive metasurfaces

Reprogrammable metasurface holographic image encryption technology based on a three-dimensional discrete hyperchaotic system

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