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Influence of V-shaped plasmonic nanostructures on beam propagation

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Abstract

The influence of V-shaped plasmonic nanostructures caused by focused ion beam milling on transmission properties are addressed in this paper. In order to evaluate the influence, a finite-difference and time-domain numerical method is employed for simulation of the plasmonic structures flanked with the corrugations with equal groove depth at the exit side of a metal film which is coated on a quartz substrate. Our simulation results have shown that a V-shaped subwavelength central slit/aperture is helpful for beam shaping. It plays a positive and dominant role in transmissivity. However, the V-shaped grooves cause a red shift of the peak wavelength and a broadening of the cut-off wavelength. This leads to the beam diverging in the region of the far field. In the case of the existence of both the V-shaped central slit and the V-shaped grooves, the influence of the grooves is less compared to that of the central slit, and can be ignored theoretically.

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Authors and Affiliations

  1. Precision Engineering and Nanotechnology Centre, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore, 639798

    Yongqi Fu, W. Zhou & L.E.N. Lim

  2. State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209, P.R. China

    C. Du, H. Shi, C. Wang & X. Luo

Authors
  1. Yongqi Fu
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  2. W. Zhou
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  3. L.E.N. Lim
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  4. C. Du
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  5. H. Shi
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  6. C. Wang
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  7. X. Luo
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Corresponding author

Correspondence to Yongqi Fu.

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PACS

02.60.Cb; 02.70.Bf; 07.79.Fc; 42.25.Bs

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Fu, Y., Zhou, W., Lim, L. et al. Influence of V-shaped plasmonic nanostructures on beam propagation. Appl. Phys. B 86, 461–466 (2007). https://doi.org/10.1007/s00340-006-2502-9

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  • DOI: https://doi.org/10.1007/s00340-006-2502-9

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