Fig. 1: Conceptual sketch of representative analog metaprocessors. | Nature Communications

Fig. 1: Conceptual sketch of representative analog metaprocessors.

From: Single-layer spatial analog meta-processor for imaging processing

Fig. 1: Conceptual sketch of representative analog metaprocessors.The alternative text for this image may have been generated using AI.

a Solving integral equation by a closed-loop network consisting of the metamaterial kernel, directional couplers and in/out waveguides. b Spatial analog computing based on the 4f Fourier optics system. (GRIN+ indicates a conventional GRIN, operates as a Fourier transformer. GRIN− has the inverse functionality of the GRIN+, which acts as an inverse Fourier transformer). c The proposed single-layer meta-processor in this work for shrinking the bulky Fourier-based designs. d Comparison of the proposed differentiator to the recently proposed designs5,24,26,31,32,33,34.

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