【摘 要】
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We propose a theory to characterize the information and information processing abilities of metasurfaces,and demonstrate the relation between the information of
【机 构】
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State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China;School of Physics
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We propose a theory to characterize the information and information processing abilities of metasurfaces,and demonstrate the relation between the information of the metasurface and its radiation patt in the far-field region.By incorporating a general aperture model with uncertainty relation in L2-space,we propose a theory to predict the upper bound of information contained in the radiation patt ofa metasurface,and reveal the theoretical upper limit of orthogonal radiation states.The proposed theory also provides guidance for inverse design of the metasurface with respect to given functionalities.Through investigation of the information of disordered-phase modulated metasurfaces,we find the information invariance (1-y,where y is Euler’s constant) of chaotic radiation patts.That is to say,the information of the disordered-phase modulated radiation patts is always equal to 1-γ,regardless of variations in size,the number of elements and the phase patt of metasurface.This value might be the lower bound of radiation-patt information of the metasurface,which can provide a theoretical limit for information modulation applications,including computational imaging,stealth technologies and wireless communications.
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