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. 2014 Oct 30;4:6830. doi: 10.1038/srep06830

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(a) The sample of the designed GRIN lens. The inlet is an enlarged view near the center of lens. (b) The simulated spatial distributions of the intensity field |p|² of the GRIN lens. (c) Closer view of the simulated distributions near the focus spot. (d) The measured spatial distributions of the intensity field |p|² of the fabricated sample.