Journal
OPTICS EXPRESS
Volume 23, Issue 15, Pages 20124-20131Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.020124
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Funding
- National Natural Science Foundation of China [51375400]
- Program for the New Star of Science and Technology of Shaanxi Province [2014KJXX-38]
- Aeronautical Science Foundation of China [2013ZC53036]
- NPU Foundation for Fundamental Research [JCY20130119]
- Fundamental Research Funds for the Central Universities [3102014JC02020504]
- Program for the New Century Excellent Talents in University
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We report a metallic planar lens based on the coupled nanoslits with variable widths for superfocusing. The influence of the interaction between two adjacent nanoslits on the phase delay is systematically investigated using the finite-difference time-domain (FDTD) method. Based on the geometrical optics and the wavefront reconstruction theory, an array of nanoslits perforated in a gold film is optimally designed to achieve the desired phase modulation for light beaming. The simulation result verifies our design in excellent agreement and the realized metallic lens reveals the superfocusing capability of 0.38. in resolution, well beyond the diffraction limit. (C) 2015 Optical Society of America
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