Microwave seminar | 19 April 2021

Mr. Muhammad Rizwan Akram will present the theory and practical realization of passive metasurfaces for the manipulation of transmissive waves. The main focus is on the design of the meta-atoms i.e. constituent particles of the metasurface in order to realize high transmission efficiency and how electric & magnetic responses play their role for that purpose. 

He will also discuss various applications based on the non-uniform distribution of meta-atoms such as realizing non-diffracting beams for small distance, OAM beams, high directive metasurface antennas and low diverging high gain beams. 

In the end, he will discuss how the reconfigurable metasurface could be able to develop smart solutions for wireless communication, charging, imaging and sensing.

1. M. R. Akram, G. Ding, K. Chen, Y. Feng, and W. Zhu. "Ultrathin Single Layer Metasurfaces with Ultra‐Wideband Operation for Both Transmission and Reflection." Adv. Mater., vol. 32, no. 12, pp. 1907308, 2020.

2. M. R. Akram, X. Bai, R. Jin, G. A. Vandenbosch, M. Premaratne, and W. Zhu, “Photon spin hall effect based ultra-thin transmissive metasurface for efficient generation of oam waves,” IEEE Trans Antennas Propag., vol. 67, no. 7, pp. 4650-4658, 2019. 

3. M. R. Akram, M. Q. Mehmood, X. Bai, R. Jin, M. Premaratne, and W. Zhu, “High efficiency ultrathin transmissive metasurfaces,” Adv. Opt. Mater., vol. 7, no. 11, pp. 1801628, 2019.

4. M. R. Akram, C. He, and W. Zhu, “Ultra-thin bi-layer metasurface based on Huygens' principle for high gain antenna applications” Opt. Express, vol. 28, no. 11, pp. 15844-15854, 2020. 

5. M. R. Akram, M. Q. Mehmood, T. Tauqeer, A. S. Rana, I. D. Rukhlenko, and W. Zhu, “Highly efficient generation of bessel beams with polarization insensitive metasurfaces,” Opt. Express, vol. 27, no. 7, pp. 9467–9480, 2019.