Fabrication and characterization of silicon woodpile photonic crystals with a complete bandgap at telecom wavelengths.
By using direct laser writing into a novel commercially available photoresist and a silicon-double-inversion procedure followed by tempering of the silicon structures, we realize high-quality centered-tetragonal woodpile photonic crystals with complete photonic bandgaps near 1.55 microm wavelength. The 6.9% gap-to-midgap ratio bandgap is evidenced by the comparison of measured transmittance and reflectance spectra with band-structure and scattering-matrix calculations.
Staude
I
I
Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany. isabelle.staude@physik.uni-karlsruhe.de
Thiel
M
M
Essig
S
S
Wolff
C
C
Busch
K
K
von Freymann
G
G
Wegener
M
M