Crystal constituent

ω a 2 π c

The mid-gap frequency of the gap (ωm)

Band-gap width

(Δω)

Gap-midgap ratio

(Δω/ωm)

Gap percentage

(%)

Hexagonal lattice of air holes in Ge

0.15229 - 0.16426

0.1586047011012

0.01260062381216

0.07944672336110

7.94