Graphene/porous silicon reconfigurable transmission filter operating at 1.55 and 1.53 μm

The present work is a numerical study of the transmission properties of a multilayer structure operating at the telecom wavelengths 1.55 and 1.53 mu m. The transmission peak is obtained by the periodic alternation of two layers of porous silicon (PS) of different porosities (85 and 75%), separated by a graphene layer. The modification of the graphene Fermi energy (E-F) allows the adjustment of the transmission peak wavelength. Fixing Fermi energy to E-F = 0.47 eV and E-F = 1.525 eV allows to set the working wavelength to 1.55 and 1.53 mu m, respectively. Under the variation of the temperature and of the degree of oxidation of the PS, the transmission properties of the structure are altered. We shows that the adjustment of E-F makes it possible to correct the shifts in the working frequency induced by these two parameters. The simulation results show that the variation of E-F can compensate the variation of the temperature on the interval 293-73 K as well as the variation of the oxidation of the PS up to 10%.

Automated summary

This study investigates the transmission properties of a multilayer structure operating at 1.55 and 1.53 μm telecom wavelengths. The results show that adjusting the graphene Fermi energy can correct shifts in the working frequency induced by temperature and oxidation of porous silicon (PS).