  We propose a parity-time symmetric dielectric-nanofilm-dielectric
multilayered structure that could facilitate highly amplified transmission of
optical power in the infrared spectrum. We have theoretically studied our model
using the transfer matrix formalism. The reflection and the transmission
coefficients of the S-matrix are evaluated. The theoretical results are
validated by FDTD numerical simulation. We have shown how the thickness of the
layers and the gain/loss coefficient of the active layers could generate
spectral singularities in the S-matrix and how these singularities could be
exploited to achieve amplified transmission of a single wavelength through the
structure.
