Fig. 9
Dispersion curves of the 1D diatomic spring-mass lattice (m2 = 2m1, m1 = 1, k = 1). The lower branch represents acoustic modes (solid line) and the upper branch represents optical modes (dashed line).
Dispersion curves of the 1D diatomic spring-mass lattice (m2 = 2m1, m1 = 1, k = 1). The lower branch represents acoustic modes (solid line) and the upper branch represents optical modes (dashed line).
