Photo Absorption Noise for Molecular Information Exchange

Versatile Nanoengineered Molecular Communication (MC) systems applications include Healthcare, Environment, Security and Telecommunication (HEST). In the MC system, the challenging issues are modeling, mitigating, and analyzing different impairments, such as noise and interference. Recently, literature presents Radiation Absorption Noise (RAN), which is the rise in temperature due to the radiation absorption of incident Electromagnetic (EM) waves. However, a complementary noise, a rise in temperature due to the absorption of Photons by Nano-Particles (NPs) at Plasmonic resonance in the THz or optical range, is missing from open literature. Therefore, this manuscript presents the rise in temperature due to Photothermal heating, either due to Photo Thermal Therapy (PTT) or due to the coexistence of MC and THz Communication (TC), which can be termed Photo Absorption Noise (PAN). First, a closed-form expression for the Probability Density Function (PDF) of the proposed PAN is presented in terms of several physical parameters such as polarization factors, Radius of NP, conductivity of metal NPs, permittivity of metal NP, thermal conductivity of medium and subtract. Further, a closed-form expression for Error Probability (EP) under PAN is also derived to quantify the effect of different physical parameters on an exchange of molecular information. Finally, numerical quantification through simulated results is presented for each closed-form expression. It is essential to mention that each simulated result perfectly agrees with the theoretical background.