Tailoring Focal Length of Plasmonic Lenses by Phase Modulation of Emitted Light
Plasmonic lens with focal length periodically tunable was proposed, which consists of a subwavelength slit surrounded by grooves. The focal length can be tailored by means of adjusting the position of one groove while the other grooves kept to be fixed. Finite-difference time-domain
(FDTD) algorithm was adopted to calculate the focusing characteristics. A theoretical and an linear approximate model were proposed to explain the simulation results theoretically, which shows agreement to the simulation results. This periodical tenability obtained in the presented scheme
is possible to be an effective method to deign focus-controllable subwavelength optical elements in integrated optics.
Keywords: FINITE-DIFFERENCE TIME-DOMAIN; PHASE MODULATION; PLASMONIC LENSES
Document Type: Research Article
Publication date: 01 July 2011
- Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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