Journal
IEEE ACCESS
Volume 7, Issue -, Pages 63801-63808Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2915263
Keywords
Convolutional neural network; resonant metalens; machine learning; subwavelength imaging
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Funding
- Research Grants Council of Hong Kong [GRF 17209918, GRF 17207114, GRF 17210815]
- Asian Office of Aerospace Research and Development [FA2386-17-1-0010]
- National Natural Science Foundation [61271158]
- HKU Seed Fund [104005008]
- Hong Kong University Grants Committee [AoE/P-04/08]
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In this paper, we utilize the deep learning approach for the subwavelength imaging in far-field, which is realized by the near-field resonant metalens at microwave frequencies. The resonating metalens consisting of split-ring resonators (SRRs) are equipped with the strong magnetic coupling ability and can convert evanescent waves into propagating waves using the localized resonant modes. The propagating waves in the far-field are utilized as the input of a trained deep convolutional neural network (CNN) to realize the imaging. The training data for establishing the deep CNN are obtained by the EM simulation tool. Besides, the white Gaussian noise is added into the training data to simulate the interference in the real application scenario. The proposed CNN composes of three pairs of convolutional and activation layers with one additional fully connected layer to realize the recognition, i.e., the imaging process. The feasibility of utilizing the trained deep CNN for imaging is validated by numerical benchmarks. Distinguished from the subwavelength imaging methods, the spatial response and Green's function need not be measured and evaluated in the proposed method.
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