Metamaterial-based polarization control plate for producing incoherent laser irradiation

摘要

We present a metamaterial-based random polarization control plate to produceincoherent laser irradiation by exploiting the ability of metamaterial in localpolarization manipulation of beam upon transmission via tuning its localgeometry. As a proof-of-principle, we exemplify this idea numerically in asimple optical system using a typical L-shaped plasmonic metamaterial withlocally varying geometry, from which the desired polarization distribution canbe obtained. The calculating results illustrate that this scheme caneffectively suppress the speckle contrast and increase irradiation uniformity,which has potential to satisfy the increasing requirements for incoherent laserirradiation.