Wave-Matter Interactions

The science of wave-matter interactions has undergone a significant transformation over the past decade with the introduction of metasurfaces, which are two-dimensional counterparts of volumetric metamaterials. These artificially engineered surfaces have opened up previously unimagined avenues for achieving unprecedented levels of wave-matter interactions, ranging from acoustics to optics, while overcoming typical constraints of bulk metamaterials.  Within the realm of surface electromagnetics, the artificial engineered surfaces provide extraordinary EM properties that go beyond the limits of existing materials, and they are widely used to manipulate the amplitude, phase, polarization, wave-vector, and other properties of EM waves. These artificial platforms have exerted a substantial influence across diverse domains, including but not limited to communication, bio-medical, computing, and quantum. The temporal modulation of material characteristics, either independently or in conjunction with spatial modulations,  has further unlock the potential of metasurfaces for extreme wave manipulation, leading to time refraction, magnetless non-reciprocity, wave synthesis, signal amplification, frequency conversion, among many others.  Additionally, the current vision of the forthcoming (6G and beyond) wireless communication systems relies on the reprogrammable wave functionalities and self-adaptability.  Integrated communication and sensing are among the potential technologies that could be used in 6G systems.

In a series of ongoing investigations, I am exploring the coarsely discretized metasurface architecture/metagratings. In the realm of coarse discretization, the periodicity selects a discrete set of Floquet channels referred to as Floquet-Bloch modes – a series of propagating and evanescent plane waves excited by periodic structure. The metasurface is designed with a specific periodicity in order to redirect an incoming wave towards one of the higher order propagating FB modes, rather than imposing an additional transverse momentum. 

Additionally, I am working on some new and exciting directions in spatiotemporal metasurfaces, which serve as the fundamental entity for designing active reconfigurable intelligent surfaces (RIS) or smart reconfigurable metasurfaces envisioned for next-generation communication systems.


Bipartite dielectric Huygens’ metasurface for anomalous refraction

Abhishek Sharma, Alex M H Wong

Physica Scripta, vol. 98, IOP Publishing, 2023 Oct, p. 115539

Floquet Mode Circulation using a Coarsely Discretized Dielectric Huygens’ Metasurface

Abhishek Sharma, Alex MH Wong

2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC), IEEE, 2022, pp. 1--4

Coarsely Discretized Huygens' Metasurface: Manipulating EM Waves with Simplicity

Abhishek Sharma, Chu Qi, Kayode A Oyesina, Alex MH Wong

2021 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), IEEE, 2021, pp. 1--6

Dimer Dielectric Huygens' Metasurface: Realizing Perfect Anomalous Reflection at 60 GHz

Abhishek Sharma, Alex MH Wong

2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI), IEEE, 2021, pp. 203--204

Towards Efficient EM Wave Manipulation Using a Discrete Dielectric Huygens’ Metasurface

Abhishek Sharma, Alex MH Wong

2020 14th European Conference on Antennas and Propagation (EuCAP), IEEE, 2020, pp. 1--3

Sparsely Discretized Refracting Dielectric Huygens’ Metasurface at 28 GHz

Abhishek Sharma, Alex MH Wong

2020 IEEE Asia-Pacific Microwave Conference (APMC), IEEE, 2020, pp. 1027--1029

Controlling Wavefront using a Coarsely Discretized Dielectric Huygens' Metasurface

Abhishek Sharma, Alex MH Wong

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, IEEE, 2020, pp. 753--754

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