Figure 2.

The absorption spectrum of signal laser and the energy levels of exciton when a single peptide QD coupling with the vibration of DNA molecules. (a) The absorption spectrum of signal laser in the presence of two optical fields for the case , Δ_c0 = 0, λ₀ = 0.5, ω_D0 = 4, τ_D0 = 33. (b) The energy levels of exciton when coupling with the vibration of DNA molecules. Part (2), (3), and (4) correspond to the transitions of the left peak, center feature and right peak, respectively, shown in (a).