Abstract
We propose two types of intelligent reflecting systems based on programmable metasurfaces and mirrors to focus the incident optical power towards a visible light communication receiver. We derive the required phase gradients for the metasurface array reflector and the required orientations of each mirror in the mirrors array reflector to achieve power focusing. Based on which, we derive the irradiance expressions for the two systems in the detector plane to characterize their performance in terms of aiming and focusing capabilities. We show analytically that the number of reflecting elements along with the relative source - reflector dimensions determine the system power focusing capability. Moreover, we quantify analytically the received power gain compared with reflector-free systems. In addition, we introduce a new simple metric to assess the relative reflectors’ performance for a given source, detector, reflector layout. Finally, we verify the analytical findings regarding absolute and relative reflectors’ performance via numerical simulations.
Highlights
I N THE past decade, the wireless communications world has experienced a quantitative growth and a qualitative one
We adopt a macroscopic model for the metasurface patches to abstract them as anomalous reflective rectangular blocks, which directs most of the incident power in a direction imposed by the generalized law of reflection depending on the incidence direction and the phase discontinuity profile of the metasurface [32]
IRRADIANCE DERIVATION To lay the foundations for deriving the irradiance generated by the metasurface reflector, we introduce a thorough definition of the adopted geometry in the upcoming ray-tracing analysis
Summary
I N THE past decade, the wireless communications world has experienced a quantitative growth and a qualitative one. Metasurfaces are synthesized materials composed of arrangements of sub-wavelength metallic or dielectric structures that are used to manipulate light propagation in unusual ways compared to classical optical devices These surfaces are capable of manipulating wavelength, polarization, and phase of incident waves. We propose an analytical framework to study the capabilities of both the adaptive metasurface and mirror array-based reflectors in focusing and aiming radiated power towards a specific detector. Towards this aim, we first derive the phase gradients to be applied to the metasurface array and the mirror array elements orientation needed to direct the incident power towards the detector center. We use |.| to represent the absolute value of a scalar and the Lebesgue measure of a set, while ek denotes the k-th column in the 3 × 3 identity matrix
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