Far-Field Near-Infrared Plasmonic Nanofocusing Effects Based on Nano Metal Structure

Abstract:

We design a new near-infrared plasmonic nanofocusing lens for far field practical applications by using nanonoble metal structure. The constructively interference of near-infrared cylindrical surface plasmon launched by the subwavelength metallic structure can form a subdiffraction-limited focus, which is modulated by the dielectric grating from the near field to the far field. The principle of designing such a far-field nanofocusing lens is elucidated in details. The numerical simulations demonstrated that nanoscale focal spot with full width of half maximum (0.43λ) can be obtained in far field with depth of focus about 2.86λ. This design method paved the road for utilizing the plasmonic lens in high-density optical storage, nanolithography, superresolution optical microscopic imaging, optical measurement, and sensing.

• Periodical: Advanced Materials Research (Volume 1081)
• Pages: 127-131
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1081.127
• Online since: December 2014
• Authors: Yan Liang, Peng Fei Cao
• Keywords: Far Field, Near-Infrared Lasmonic, Resolution Limit, Subwavelength Etallic Ructure, Superfocusing

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