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(Color online) (a) Photonic band structure for the TE-like modes (even parity) of polystyrene PhCS waveguides suspended in air with a triangular array of air holes [, , where is the lattice constant (period), is the hole radius, and is the slab thickness]. The frequency is normalized to , where is the light velocity in vacuum. (b) Photonic bands of defect modes for the width of line defect , where is the width of the line defect created by removing a line of holes in the direction. The closed (open) circles denote the even (odd) defect modes that are symmetric (asymmetric) in the plane bisecting the line defect.
(Color online) Fabrication process schematics of nanoimprint lithography for the air-suspended membrane-type 2D PPhCS waveguide.
(Color online) Field emission scanning electron microscopy images of the large-area 2D polystyrene photonic crystal slabs with a triangular array of air holes and a line defected waveguide structure fabricated by NIL; (a) top view of the large array, and [(b)–(d)] different side views. (c) and (d) show a conventional waveguide at the end of the PhCS waveguide. The triangular array of air holes consists of holes with a diameter of and depth of .
(Color online) (a) Near field image obtained with a white light source. (b) Optical transmission spectra of a PhCS waveguide for three cases: a simulated PhCS waveguide structure, a structure with the fabricated dimensions, and the measurement of the polystyrene PhCS waveguide fabricated by NIL. All three spectra show the characteristic PBG dip near .
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