PhD Seminars 2023 | Photonic limiter based on exceptional point spectral degeneracies

Title: Photonic limiter based on exceptional point spectral degeneracies

Abstract: We propose a new type of photonic reflective limiter which respects a pseudo-Parity-Time (PT) symmetry. The system consists of two optically similar cavities with differential loss and it is prepared in a way that at low incident light powers demonstrates an exceptional point (EP) spectral degeneracy which supports a high resonant transmission. For high powers of the incident light, a non-linear (Hermitian) mechanism is activated, leading to a detuning of one of the cavities and a subsequent lift of the spectral degeneracy. The resulting resonant modes have either low Q-factor or are unstable due to the non-linearity. Consequently, the resonant transmission is dramatically suppressed while the reflectivity reaches values of order unity. We capitalize on this sudden (self-induced) drop of transmittance in order to propose these PCs as a new architecture for reflective limiters and switches.

Disclaimer: The whole Trento academic community is invited to participate. However, since this space is dedicated to PhD students, we would like to maintain an informal and welcoming environment

General information: The seminar will be held at ECT*, Villa Tambosi, Strada delle Tabarelle 286, Villazzano.

To reach Villa Tambosi: take bus number 13 from Povo (one leaves around 11) or bus number 6 from the city center. The bus stops is in front of the Villa.