Tunable defect states in 1D photonic bandgap nanostructures

  1. Get@NRC: Tunable defect states in 1D photonic bandgap nanostructures (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1117/12.681181
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Journal titleTuning the Optic Response of Photonic Bandgap Structures III
Series titleProceedings of SPIE; Volume 6322
Pages632207-1632207-11; # of pages: 11
Subjectnanostructured materials; FDTD simulations; photonic bandgap materials; bandgap tuning; gradient-index thin films; glancing angle deposition
AbstractThe fabrication of one dimensional photonic bandgap nanostructures is described and the optical properties of these structures are examined. Using a deposition technique known as a glancing angle deposition (GLAD), porous films with a predefined nanoscale geometry are created. Specifically, in the present work we consider GLAD fabricated thin films characterized by periodically varying refractive index in one-dimension. We introduce a variety of planar defect layers into the structures and investigate the resulting changes observed in the photonic bandgap of the system. Theoretical simulation of transmittance spectra of GLAD fabricated films is performed with the finite-difference time-domain (FDTD) method and the results are compared with experimental measurements. Modifications of the transmittance spectra are investigated by changing the geometry of the defect layer and varying the void region effective index. It is shown that the spectral width and location of states within the bandgap is controlled by the geometry of defect and film microstructure. Active tunability of the defect states is obtained by considering infilling of the void regions of the structure with nematic liquid crystals and then analyzing the optical spectrum for various orientations of the liquid crystal director axis.
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AffiliationNational Research Council Canada; National Institute for Nanotechnology
Peer reviewedNo
NPARC number12327170
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Record identifier99272838-86c8-4b33-879a-d6b292a653a3
Record created2009-09-10
Record modified2017-09-13
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