Dual-channel infrared holographic metasurface based on composite phase modulation

Zhe Wang; Peng Dong; Ming Zhang

doi:10.1117/12.3035957

22 November 2024 Dual-channel infrared holographic metasurface based on composite phase modulation

Zhe Wang, Peng Dong, Ming Zhang

Proceedings Volume 13240, Holography, Diffractive Optics, and Applications XIV; 1324021 (2024) https://doi.org/10.1117/12.3035957
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Conference Poster

Abstract

Metasurface provide a new method to manipulate electromagnetic wave. The geometric phase obtained through rotating meta-atoms is widely used in broadband phase modulation technology. Although utilizing geometric phase modulation of metasurfaces enables flexible control over the response of electromagnetic waves, that is, by constructing specific phase distributions, desired electromagnetic functionalities can be achieved, along with the design of requisite electromagnetic devices. However, due to the inherent spin-locking nature of geometric phases, relying solely on a single-phase modulation method is increasingly unable to meet the application requirements for the integration, miniaturization, and intelligentization of electromagnetic devices. To address the aforementioned challenge, in order to break the spin-locking characteristic of geometric phase, we have realized decoupled design for orthogonal circularly polarized waves based on the composite modulation concept of geometric phase and transmission phase. We designed eight meta-atoms composed of silicon pillars and a substrate. for infrared wavelengths, with adjacent meta-atoms having fixed phase gradient of π/4. Meanwhile, the geometric phase of each meta-atom can cover the range of 0~2π. Subsequently, taking the holography as examples, the decoupled design of orthogonally circularly polarized waves is achieved, and the simulation results verify the feasibility of the aforementioned spin-decoupled regulation mechanism. In conclusion, the above metasurface exhibits excellent ability to regulate electromagnetic waves in the infrared spectrum. This research has potential application prospects in the fields of infrared communication, imaging, and others.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhe Wang, Peng Dong, and Ming Zhang "Dual-channel infrared holographic metasurface based on composite phase modulation", Proc. SPIE 13240, Holography, Diffractive Optics, and Applications XIV, 1324021 (22 November 2024); https://doi.org/10.1117/12.3035957

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