Meta-lenses, distinguished by their compact size and adaptable manipulation, have attracted considerable interest. Yet, challenges persist for conventional tunable meta-lenses, including complexity, high costs, and limited responses, constraining their performance and applications. In our research, we introduce innovative tunable water and 3D printing meta-lenses tailored for millimeter waves. This technology empowers the delivery of the focusing spot to arbitrary positions in two-dimensional or three-dimensional space. Notably, it allows the precise transmission of a highly concentrated signal to a specific location, with the added capability of adjusting the transmission direction freely. This breakthrough enables the development of secure, flexible, and highly directive 6G communication systems. Our proposed approach overcomes existing limitations and holds promise for diverse applications in wireless power transfer, zoom imaging, and remote sensing.
Meta-devices, which are advanced optical elements composed of meta-atoms engineered at the sub-wavelength scale, have garnered significant attention from researchers due to their ability to manipulate the characteristics of incident electromagnetic waves. However, conventional meta-devices, primarily consisting of a single type of meta-atom, suffer from an intrinsic lack of freedom, which in turn restricts their performance and limits their application potential. An integrated resonant unit (IRU) has emerged as a promising solution. It combines multiple meta-atoms, resonant modes, and functionalities into a supercell, can achieve responses and functionalities that exceed those of conventional meta-atoms. This talk will first illustrate the concept of IRUs and then employ two different types of IRUs, plasmonic and dielectric, to demonstrate their ability that break through the phase compensation limitations and improve working efficiency for enhancing achromatic focused beam generation. (Din Ping Tsai's Advanced Photonics review paper on integrated-resonant metadevices is the winner of a 2023 Advanced Photonics EIC’s Choice Award)
Integrated-resonant units (IRUs), associating various meta-atoms, resonant modes, and functionalities into one supercell, have been promising candidates for tailoring composite and multifunctional electromagnetic responses with additional degrees of freedom. Integrated-resonant metadevices can overcome many bottlenecks in conventional optical devices, such as broadband achromatism, efficiency enhancement, response selectivity, and continuous tunability, offering great potential for performant and versatile application scenarios. We focus on the recent progress of integrated-resonant metadevices. Starting from the design principle of IRUs, a variety of IRU-based characteristics and subsequent practical applications, including achromatic imaging, light-field sensing, polarization detection, orbital angular momentum generation, metaholography, nanoprinting, color routing, and nonlinear generation, are introduced. Existing challenges in this field and opinions on future research directions are also provided.
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