Inhomogeneous Polarization Transformation Reveals PT-Transition in non-Hermitian Optical Beam Shift

• URL: http://arxiv.org/abs/2310.14210v2
• Date: Mon, 29 Jan 2024 14:48:11 GMT
• Title: Inhomogeneous Polarization Transformation Reveals PT-Transition in non-Hermitian Optical Beam Shift
• Authors: Niladri Modak, Swain Ashutosh, Shyamal Guchhait, Sayan Ghosh, Ritwik Dhara, Jeeban Kumar Nayak, Sourin Das, Nirmalya Ghosh
• Abstract summary: Despite its non-Hermitian nature, the transverse optical beam shift exhibits both real eigenvalues and non-orthogonal eigenstates. To explore this unexpected similarity to typical PT (parity-time)-symmetric systems, we first categorize the entire parametric regime of optical beam shifts into Hermitian, PT-unbroken, and PT-broken phases.
• Score: 4.683466105905366
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Despite its non-Hermitian nature, the transverse optical beam shift exhibits both real eigenvalues and non-orthogonal eigenstates. To explore this unexpected similarity to typical PT (parity-time)-symmetric systems, we first categorize the entire parametric regime of optical beam shifts into Hermitian, PT-unbroken, and PT-broken phases. Besides experimentally unveiling the PT-broken regime, crucially, we illustrate that the observed PT-transition is rooted in the momentum-domain inhomogeneous polarization transformation of the beam. The correspondence with a typical non-Hermitian photonic system is further established. Our work not only resolves a longstanding fundamental issue in the field of optical beam shift but also puts forward the notion of novel non-Hermitian spin-orbit photonics: a new direction to study non-Hermitian physics through the optical beam shifts.

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