Numerical simulation and rational design of optically anisotropic columnar films

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Series titleProceedings of SPIE
ConferencePhotonic and Phononic Properties of Engineered Nanostructures, 24 January 2011 through 27 January 2011, San Francisco, CA
SubjectFDTD simulations; Frequency-domain methods; Glancing angle deposition technique; Morphological parameters; Numerical simulation; Optical spectra; Photonic bandgap materials; thin film polarizers; Dielectric films; Energy gap; Finite difference time domain method; Frequency domain analysis; Growth (materials); Multilayer films; Nanostructures; Optical instruments; Photonic band gap; Photonic devices; Physical vapor deposition; Thin films; Time domain analysis; Optical films
AbstractOptical anisotropy is an inherent property of columnar dielectric films, such as those fabricated by the glancing angle deposition (GLAD) technique. This process utilizes physical vapor deposition combined with computer-controlled substrate motion to finely tune the direction of column growth and vital morphological parameters such as column cross-section and inter-columnar spacing. Control over the anisotropic properties of the porous film provides an opportunity to design polarization-selective photonic devices and films with improved band gap properties. Anisotropic defects in multilayer films also result in a polarization-sensitive position of resonant transmission modes. We employed the finite-difference time-domain and frequency-domain methods to theoretically analyze and design columnar films with unique band-gap properties. The following morphologies were considered: (i) S-shaped columnar films with polarization-dependent band-gap position and width. Using numerical simulations we have shown that the competitive effect of different sources of anisotropy can be used to engineer photonic band gaps with strong selectivity to linearly-polarized light; (ii) Rugate thin films with an anisotropic defect, which exhibit resonant mode splitting. Optical devices were fabricated using titanium dioxide because it has good transparency in the visible range of the optical spectrum and a large bulk refractive index. Experimental results were compared to simulations to verify the designs and understand the limitations of the fabrication process. © 2011 SPIE.
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AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology
Peer reviewedYes
NPARC number21272000
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Record identifier6da26851-adc0-42d5-9787-019f949d402b
Record created2014-05-16
Record modified2016-05-09
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