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arXiv · 2105.13551

Second-order correlation function supported optical sensing for particle detection

T. Wang·C. Jiang·J. Zou·H. Zhou·X. Lin·H. Chen·G. P. Puccioni·G. Wang·G. L. Lippi
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Abstract

We propose a new sensing method based on the measurement of the second-order autocorrelation of the output of micro- and nanolasers with intensity feedback. The sensing function is implemented through the feedback-induced threshold shift, whose photon statistics is controlled by the feedback level in a characteristic way for different laser sizes. The specific response offers performances which can be adapted to different kinds of sensors. We propose the implementation of two schemes capable of providing a quantitative sensing signal and covering a broad range of feedback levels: one is utilizing the evolution of g$^{(2)}$(0), the other one is the ratio between central and side peaks in g$^{(2)}(\tau)$. Laser-threshold-based sensing could, thanks to its potential sensitivity, gain relevance in biomolecular diagnostics and security monitoring.

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T. Wang, C. Jiang, J. Zou, H. Zhou, X. Lin, H. Chen, G. P. Puccioni, G. Wang, G. L. Lippi. 2021-05-28. Second-order correlation function supported optical sensing for particle detection. https://arxiv.org/abs/2105.13551

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