Abstract
Microscale three-dimensional photonic crystals with different dielectric volume fractions (β) were fabricated to tune the band gaps in the subterahertz frequency range. When changed β from 33% to 20% in the SiO2–Al2O3 ceramic-resin photonic crystals with a lattice constant of 500μm, the measured first band gaps were increased from 380–450to450–520GHz. After dewaxing and sintering, the lattice constant of SiO2–Al2O3 ceramic photonic crystals were shrunk to 380μm, and the observed band gaps correspondingly appeared from 470–540GHzto520–600GHz. These experimental results were further confirmed by calculation of band diagrams using the plan wave expansion method.
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