The present contribution provides a link between optical pumping with polarized light and polarized optical injection in a Quantum-Dot (QD) Vertical-Cavity Surface-Emitting Lasers (VCSEL). Based on the sensitivity of the QD spin-VCSEL to the stability state before the injection and the rich dynamic behaviour induced by optical injection we perform an analysis of optimized parameters for the demonstration of extended chaotic regions. The proposed scheme aims at ultrafast random bit generation (RBG) reducing the complexity of wellestablished systems based on VCSELs to generate high-quality chaos signals. Our investigations reveal that inside these regions an enhancement of chaotic bandwidth up to 50 GHz can be achieved, exceeding the stateof-the-art performance of conventional VCSELs under continuous wave (CW) optical injection. We show that in addition to exhibiting enhanced polarization chaos, QD spin-VCSELs enable 240 Gbit/s RBG thus allowing future exciting routes for cryptography and secure communications.
A novel CGH algorithm is proposed for targeted neural stimulation using a few pixel Spatial Light Modulator (SLM) device. This is achieved with the elaboration of standard CGH design algorithms to include a regularized cost function for the discretization of phase and amplitude. The regularized cost function is appropriate for designing holographic masks that can be realized using a few pixel SLM. It is anticipated that these results will contribute to the research efforts towards a portable in vivo optogenetic system.
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