2023/08/31 by Marco Saldutti, Yi Yu, Saldutti, Marco +7
Engineering · Physics and Astronomy · #Photonic and Optical Devices #Molecular Junctions and Nanostructures #Mechanical and Optical Resonators
paper · pdf · doi:10.48550/arxiv.2308.16715
It is shown that semiconductor nanoscale resonators with extreme dielectric confinement accelerate the diffusion of electron-hole pairs excited by nonlinear absorption. These novel cavity designs may lead to optical switches with superior modulation speeds compared to conventional geometries. The response function of the effective carrier density is computed by an efficient eigenmode expansion technique. A few eigenmodes of the diffusion equation conveniently capture the long-timescale carrier decay rate, which is advantageous compared to time-domain simulations. Notably, the eigenmode approach elucidates the contribution to carrier diffusion of the in-plane and out-of-plane cavity geometry, which may guide future designs.