Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Active Focusing of Light in Plasmonic Lens via Kerr Effect

  • Nasari, Hadiseh (Department of Electrical and Computer Engineering, K. N. Toosi University of Technology) ;
  • Abrishamian, Mohammad Sadegh (Department of Electrical and Computer Engineering, K. N. Toosi University of Technology)
  • Received : 2012.05.03
  • Accepted : 2012.06.26
  • Published : 2012.09.25
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Abstract

We numerically demonstrate the performance of a plasmonic lens composed of an array of nanoslits perforated on thin metallic film with slanted cuts on the output surface. Embedding Kerr nonlinear material in nanoslits is employed to modulate the output beam. A two dimensional nonlinear-dispersive finite-difference time-domain (2D N-D-FDTD) method is utilized. The performance parameters of the proposed lens such as focal length, full-width half-maximum, depth of focus and the efficiency of focusing are investigated. The structure is illuminated by a TM-polarized plane wave and a Gaussian beam. The effect of the beam waist of the Gaussian beam and the incident light intensity on the focusing effect is explored. An exact formula is proposed to derive electric field E from electric flux density D in a Kerr-Dispersive medium. Surface plasmon (SPs) modes and Fabry-Perot (F-P) resonances are used to explain the physical origin of the light focusing phenomenon. Focused ion beam milling can be implemented to fabricate the proposed lens. It can find valuable potential applications in integrated optics and for tuning purposes.

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References

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