Spectroscopy of photonic crystals

Summary form only. We have fabricated crystals made of macroporous silicon. A triangular lattice of air rods with a lattice constant of 1.5 /spl mu/m has been etched 100 /spl mu/m deep into an n-type silicon substrate by electrochemical pore formation in aqueous hydrofluoric acid. A point-defect as well as two linear defects (waveguide structures) are incorporated in the crystal through the appropriate prepatterning of the substrate before etching. A widely tunable continuous wave OPO was used to perform transmission measurements on the structure. The resonance observed in the band gap displayed in the Fourier Transform infrared spectrum is shown. We present our results on structures with various fabrication parameters and geometries. We also show the results of numerical simulations performed by our collaborators and compare them with our experimental measurements.