Mohamad Bashardost - Department of Electrical engineering, Islamic Azad University-Tabriz, Iran
S. Salar Hosseini - Department of Electrical engineering, Islamic Azad University- Tehran science and research branch, Tehran, Iran
Karim Abbasian - Department of Electrical engineering, Tabriz University, Tabriz, Iran

A metal-semiconductor-metal structure -based optical sensors and plasmonic nanoparticles to absorption enhancement, generation exciton improvement, optical responsivity we designed. This design includes metallic nano grating, sub -wavelength aperture, nanoparticles are embedded in an absorption region. We do this for the first time a new structure to capture and transmission-electron-hole pairs generated in the active region to metal electrodes, we have designed. Our simulation finite difference time domain method for solving Maxwell s equations and the theory of the structure Mai, absorption and scattering of light, generation rates, drift-diffusion in terms of our simulation. The results include a factor of absorption enhancement to 30, the responsivity of 45 micro amps per watt, quantum efficiency of 70% at a wavelength of 820 nm. which for the first time with the design of the new structure, optimize the size of the nanoparticles in the active region and the thickness of the metal grating to improve all these parameters achieved in the infrared spectral range

photodetector, plasmonic, nanoparticles, responsivity optimization, absorption enhancement, infrared, FDTD method