A concave photonic crystal waveguide with a corrugated surface for high-quality focusing |
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| Authors: | Hong Wu Liyong Jiang Haipeng Li Wei Jia Gaige Zheng Haixia Qiang and Xiangyin Li |
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| Affiliation: | 1 Department of Physics,Nanjing University of Science and Technology,Nanjing 210094,China 2 Nanoscale Technology and Engineering Laboratory,Department of Mechanical Engineering,Schulich School of Engineering,University of Calgary,Calgary,Alberta,T2N 2N4,Canada 3 Tanaka Metamaterials Laboratory,RIKEN,Saitama 351-0198,Japan |
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| Abstract: | A concave two-dimensional(2D) photonic crystal waveguide(PCW) with corrugated surface is theoretically used as a focusing structure.To design this structure,a genetic algorithm is combined with the finite-difference time-domain method.For PCWs with different degrees of concaveness,the power reaches about 80% at different focusing points when the morphology of the concave surface is optimized.More importantly,the focusing location is easily controlled by changing the location of the detector placed in the output field. |
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