Abstract
The past decade has seen the rise of the metasurface to become a ubiquitous tool for shaping electromagnetic waves. As the phase, amplitude polarization of waves can be manipulated with high fidelity, the metasurface attracts much interest and finds increasing use in the manipulation of EM waves, in both near-field and far-field situations, with wide-ranging applications in communication, sensing and imaging.
Where most contemporary metasurfaces feature elements much smaller than the wavelength, recent research efforts from our group have demonstrated various advantages for using aggressively discretized metasurface elements whose cell sizes range from λ/3 to λ/4. In this talk, we will briefly overview how one could analyze such metasurfaces, then report simulation and experimental results showcasing benefits achieved by such metasurfaces. Some example projects include efficient and wideband anomalous reflection and transmission metasurfaces and scattering cross-section reduction metasurfaces. Some realised advantages include high efficiencies (over 95% for reflection, around 80% for transmission), wide bandwidths (surpassing 50%) and robust device feature sizes (multi-fold increased from previous metasurfaces, without sacrificing performance). The discretized metasurface concept can also be applied to actively generate the required equivalent surface currents to generate an arbitrary wave inside a metal cavity, with potential applications to antenna beamforming and imaging. These improvements make a strong case for the study and utilisation of aggressively discretized metasurfaces, especially in future generation, high frequency devices.
We acknowledge support from an ECS Grant from the Hong Kong Research Grants Council (Grant No. 21211619).
Where most contemporary metasurfaces feature elements much smaller than the wavelength, recent research efforts from our group have demonstrated various advantages for using aggressively discretized metasurface elements whose cell sizes range from λ/3 to λ/4. In this talk, we will briefly overview how one could analyze such metasurfaces, then report simulation and experimental results showcasing benefits achieved by such metasurfaces. Some example projects include efficient and wideband anomalous reflection and transmission metasurfaces and scattering cross-section reduction metasurfaces. Some realised advantages include high efficiencies (over 95% for reflection, around 80% for transmission), wide bandwidths (surpassing 50%) and robust device feature sizes (multi-fold increased from previous metasurfaces, without sacrificing performance). The discretized metasurface concept can also be applied to actively generate the required equivalent surface currents to generate an arbitrary wave inside a metal cavity, with potential applications to antenna beamforming and imaging. These improvements make a strong case for the study and utilisation of aggressively discretized metasurfaces, especially in future generation, high frequency devices.
We acknowledge support from an ECS Grant from the Hong Kong Research Grants Council (Grant No. 21211619).
| Original language | English |
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| Publication status | Presented - 25 May 2021 |
| Event | 13th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2021) - Nanjing International Youth Convention Hotel, Nanjing, China Duration: 23 May 2021 → 26 May 2021 http://www.em-conf.com/icmmt2021/index.php http://www.em-conf.com/icmmt2021/downloads/ICMMT2021-Session-Schedule-20210512-V2.html |
Conference
| Conference | 13th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2021) |
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| Abbreviated title | ICMMT2021 |
| Place | China |
| City | Nanjing |
| Period | 23/05/21 → 26/05/21 |
| Internet address |