Pump-probe experiment in a non-linear chaotic photonic cavity : modulation of a Physically Unclonable Function

How to design a PUF, physically unclonable function[1], is a recurrent problem in information theory and cryptography. In our group, we use a non-linear truncated disk of silicon in a silicon dioxide background as a semi-chaotic cavity[2]. Silicon waveguides show non-linear effect during the propagation of high-amplitude pulses, which further complexifies the underlying physics of our device. From known results and performances of actual devices[3], we will first show here how one can enhance the photon lifetime in such a cavity to increase the information content in our operating bandwidth, and in a second part use a co-propagating laser pump in order to locally modulate the refractive index, allowing us to control the cavity's response.

[1] M. Roel, and I. Verbauwhede. Towards Hardware-Intrinsic Security. Springer, Berlin, Heidelberg, 2010. 3-37.
[2]Grubel, Brian C., et al. Optics express 25.11 (2017): 12710-12721.
[3] Grubel, Brian C., et al. arXiv preprint arXiv:1711.02222 (2017).