Glare suppression focusing method for high polarization purity focus generation

When a light beam propagates through strongly scattering media, not only does its amplitude and phase distribution become scrambled, but its polarization state also becomes randomized. This depolarization effect imposes significant limitations on the applications of vector light fields in scattering environments. In this Letter, we propose a glare suppression-based method for achieving highly polarization-pure scattering light focusing. For the target polarization direction, we employ the transmission matrix method to calculate the optimized focusing mask. While in its orthogonal-polarization direction, we utilize singular value decomposition (SVD) of the transmission matrix to identify low-eigenvalue transmission channels and reconstruct the focusing mask. Experimentally, we demonstrate over 40-fold enhancement in focal polarization ratio compared to a conventional method. We believe our method provides an effective solution for controlling full-polarization output using single-polarization input, which will be of interest in the fields of wavefront shaping and structured light.