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Nano-optical microlens with ultrashort focal length using negative refraction
B. D. F. Casse, W. T. Lu, Y. J. Huang, and S. Sridhar
We have experimentally realized an ultrashort focal length planoconcave microlens in an InP/InGaAsP semiconductor two-dimensional (2D) photonic crystal with negative index of refraction (0.7). At lambda=1.5 [mu]m, the lens exhibits ultrashort focal lengths of 12 [mu]m (~8lambda) and numerical aper ... [Appl. Phys. Lett. 93, 053111 (2008)] published Thu Aug 7, 2008.
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