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30 August 2006Tunable defect states in 1D photonic bandgap nanostructures
The 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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Kyrylo Tabunshchyk, Matthew M. Hawkeye, Michael J. Brett, Andriy Kovalenko, "Tunable defect states in 1D photonic bandgap nanostructures," Proc. SPIE 6322, Tuning the Optic Response of Photonic Bandgap Structures III, 632207 (30 August 2006); https://doi.org/10.1117/12.681181