Investigation of optical properties by localized surface plasmon excitation of nanoparticle arrays in photodetectors

We investigate absorption in the active medium by localized surface plasmon excitation of metal nanoparticle arrays. Calculations show for each specific application of the photodetector, which size of the metal nanoparticles should be deposited on photodetector. We show that the power absorption in the active medium in the presence of silver nanoparticle arrays in a certain wavelength range is more than gold nanoparticle arrays. Presence of nanoparticle arrays on surface of active medium can lead to dependence of absorption on wavelength and distance from nanoparticle arrays. Absorption cross-section in active medium strongly depends on distance from nanoparticle array that should be considered in design of embedded semiconductor quantum dots in the active medium.