Calculation of the transmission peak at the band gap of one-dimensional photonic crystal with an active layer

Tamm plasmons (TP) attract interest due to their applications in a new type of lasers and high sensitivity sensors. Hybrid plasmonic-photonic crystals allow direct excitation of TP without prisms and gratings. These crystals consist of two components: photonic crystal (PC) and metal layer on the surface of PC. The optical transmission has been still insufficiently studied for the hybrid plasmonic-photonic crystal with a buffer layer between PC and a layer of gold. In this paper, we have considered the dependence of the wavelength of the TP on the thickness and refraction index of the buffer layer. Photonic crystal has spatial periodicity of the refraction index in one direction. The transmission spectra of 1D plasmonic-photonic crystals have been calculated by FDTD modeling. The wavelength of the transmission peak in the photonic band gap increases along with the increase of the refractive index and thickness of the first dielectric layer in the metal-PC interface. The intensity of the transmission peak in the photonic band gap increases and then decreases along with the increase with the thickness of the first dielectric layer in metal-PC interface. Therefore, we can change the distribution of energy inside the hybrid photonic-plasmonic mode. The wavelength of the TP can be changed by tuning the refractive index and the thickness of the buffer layer. These results have application potential for developing lasers and sensors.