在合适的晶格常数和介电常数比条件下，在光子晶体的光子能带间出现使某些频

Ratio condition occurs in the photonic crystal photonic band between a suitable lattice constant and dielectric constant of electromagnetic waves at certain frequencies completely impermeable frequency region subregional become the photonic bandgap.

Under the condition of suitable lattice constant and dielectric constant ratio, the region becomes a photon band gap when the photon-in-the-photon can appear between the photon-energy bands that make certain frequencies completely impassable.

Under the appropriate ratio of lattice constant and dielectric constant, there are frequency regions between the photonic bands of the photonic crystal that make the electromagnetic wave of some frequencies completely unable to pass through, and the sub region becomes the photonic band gap.<br>