LASER-MICROMACHINED MILLIMETER-WAVE PHOTONIC BAND-GAP CAVITY STRUCTURES

We have used laser-micromachined alumina substrates to build a three-d imensional photonic band-gap crystal, The rod-based structure has a th ree-dimensional full photonic band gap between 90 and 100 GHz. The hig h resistivity of alumina results in a typical attenuation rate of 15 d B per unit cell within the band gap. By removing material, we have bui lt defects which can be used as millimeter-wave cavity structures. The resulting quality (Q) factors of the millimeter-wave cavity structure s were as high as 1000 with a peak transmission of 10 dB below the inc ident signal. (C) 1995 American Institute of Physics.