Non-Hermitian heterostructure for two-parameter sensing

Abstract

Non-Hermitian systems at the exceptional point (EP) degeneracy are demonstrated to be highly sensitive to environmental perturbation. Here, we propose and theoretically investigate a novel multilayered heterostructure favoring double EPs for a unique set of material parameters at which forward- and backward-reflection coefficients vanish, respectively. Such an EP heterostructure is shown to scatter off light when system parameters are perturbed away from the degeneracies due to the effect of ambient temperature and mechanical stress fluctuations. The proposed structure is conducive in manipulating optical responses for two mutually independent parameters sensing.

References in corpus (5)

• The physics of exceptional points
• Nonlinear waves in $\mathcal{P}\mathcal{T}$-symmetric systems
• Metrology with $\mathcal{P}\mathcal{T}$-symmetric cavities: Enhanced sensitivity near the $\mathcal{P}\mathcal{T}$-phase transition
• Conservation relations and anisotropic transmission resonances in one-dimensional PT-symmetric photonic heterostructures
• Exceptional Point Engineered Glass Slide for Microscopic Thermal Mapping

Cited by in corpus (3)

• Parity-Time Symmetry in Non-Hermitian Complex Optical Media
• Exceptional Cones in 4D Parameter Space
• Non-Hermitian Multimode Interference