Abstract

We report the large enhancement of optical limiting effects by exploiting the anisotropy of a two-photon absorber and manipulating the polarization distribution of the light field simultaneously. After modeling the polarization-orientation dependence on the two-photon absorption (TPA) coefficient, we demonstrate the enhanced TPA effect on an anisotropic two-photon absorber using radially polarized beams (RPBs) and show its interesting applications through the Z-scan technique and an optical limiter. The numerical results reveal that both the sensitivity of the Z-scan technique and the optical limiting effect on an anisotropic two-photon absorber using RPBs have great enhancement compared with those on an isotropic two-photon absorber and using linearly polarized Gaussian beams. The presented work opens up new avenues for the enhancement of polarization-dependent nonlinear optical effects, which have potential applications in two-photon lithography, polarization-sensitive photodetectors, and multi-photon photoluminescence imaging.

© 2016 Optical Society of America

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