Phonon-Polariton Reststrahlen Band

Material Parameters

TO phonon freq ω_TO: 1.0 LO-TO splitting (Δ²): 0.5 ∞ permittivity ε∞: 4.0 Damping γ: 0.02 Display: Dispersion

Phonon-polariton:
ε(ω) = ε∞(ω²_LO - ω²)/(ω²_TO - ω²)
ω_LO² = ω_TO² + Δ² (LST relation)

Reststrahlen band: ω_TO < ω < ω_LO
ε(ω) < 0 → total reflection, no propagation