Proposed Square Spiral Microfabrication Architecture for Large Three-Dimensional Photonic Band Gap Crystals
Ovidiu Toader,
Sajeev John
We present a blueprint for a three-dimensional photonic
band gap (PBG) material that is amenable to large-scale
microfabrication on the optical scale using glancing angle deposition
methods. The proposed chiral crystal consists of square spiral posts on a tetragonal lattice. In the case of silicon posts in air (direct structure), the full PBG can be as large as 15% of the gap center frequency, whereas for air posts in a silicon background (inverted structure) the maximum PBG is 24% of the center frequency. This PBG
occurs between the fourth and fifth bands of the photon dispersion relation and is very robust to variations (disorder) in the geometrical parameters of the crystal.
Department of Physics, University of Toronto, 60 St. George
Street, Toronto M5S-1A7, Canada. E-mail: ovi{at}physics.utoronto.ca
(O.T.); john{at}physics.utoronto.ca (S.J.)
Department of Physics, University of Toronto, 60 St. George
Street, Toronto M5S-1A7, Canada.
E-mail: ovi{at}physics.utoronto.ca (O.T.);
john{at}physics.utoronto.ca (S.J.)
