Journal
OPTICS EXPRESS
Volume 19, Issue 16, Pages 15221-15228Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.015221
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Funding
- Air Force Office of Scientific Research (AFOSR)
- National Science Foundation (NSF)
- Beijing Institute of Technology (BIT)
- China Scholarship Council (CSC)
- Penn State Center for Nanoscale Science (MRSEC)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820404] Funding Source: National Science Foundation
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We have designed and fabricated a dual-band plasmonic absorber in the near-infrared by employing a three-layer structure comprised of an elliptical nanodisk array on top of thin dielectric and metallic films. finite difference time domain (FDTD) simulations indicate that absorption efficiencies greater than 99% can be achieved for both resonance frequencies at normal incidence and the tunable range of the resonant frequency was modeled up to 700 nm by varying the dimensions of the three-layer, elliptical nanodisk array. The symmetry in our two-dimensional nanodisk array eliminates any polarization dependence within the structure, and the near-perfect absorption efficiency is only slightly affected by large incidence angles up to 50 degrees. Experimental measurements demonstrate good agreement with our simulation results. (C) 2011 Optical Society of America
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