Multiple Trains Of Same-Color Surface Plasmon-Polaritons Guided by the Planar Interface of a Metal Film and a Sculptured Nematic Thin Film

Open Access
Author:
Motyka, Michael
Graduate Program:
Engineering Science
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
April 16, 2009
Committee Members:
  • Akhlesh Lakhtakia, Thesis Advisor
Keywords:
  • surface plasmon polaritons
  • sculptured nematic thin films
  • surface plasmon resonance
Abstract:
A sculptured nematic thin film (SNTF) is an assembly of parallel nanowires that are shaped in a fixed plane orthogonal to the substrate on hich the film is deposited. The absorbance, reflectance, and transmittance of a linearly polarized, obliquely incident plane wave were calculated for a planar metal/SNTF interface in the Kretschmann configuration, the wave vector of the plane wave being arbitrarily oriented with respect to the morphologically significant plane of the SNTF. The permittivity profile of the chosen SNTF was supposed to have been sculptured during physical vapor deposition by varying the vapor incidence angle sinusoidally about a mean value. Calculations revealed that (i) multiple surface-plasmon-polariton (SPP) trains of the same color can be independently launched at the metal/SNTF interface, (ii) not all SPP trains have to be co-propagating, and (iii) not all SPP trains have to be of the same linear polarization state. As different SPP trains move along the interface with different speeds, exciting prospects emerge for error-free sensing and plasmonics-based communication.