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We have studied the reflectivity of CMOS-compatible three-dimensional siliconinverse woodpile photonic crystals at near-infrared frequencies.Polarization-resolved reflectivity spectra were obtained from two orthogonalcrystal surfaces corresponding to 1.88 pi sr solid angle. The spectra revealbroad peaks with high reflectivity up to 67 % that are independent of thespatial position on the crystals. The spectrally overlapping reflectivity peaksfor all directions and polarizations form the signature of a broad photonicband gap with a relative bandwidth up to 16 %. This signature is supported withstopgaps in plane wave bandstructure calculations and with the frequency regionof the expected band gap.

Signature of a three-dimensional photonic band gap observed on silicon inverse woodpile photonic crystals