Polarization-controlled non-Hermitian metasurfaces for ultra-sensitive terahertz sensing
arXiv:2408.00579 · doi:10.1002/lpor.202500172
Abstract
Non-Hermitian systems offer significant advantages in sensor design, especially at the exceptional points. However, the extreme sensitivity near these points poses great challenges due to fabrication errors and system noises, which degrade sensing performance. To address this, we introduce a novel approach leveraging the polarization degrees of freedom in non-Hermitian systems. In this work, we establish a direct relation between the incident polarization and the transmission phase of a coupled metasurface system and achieve the polarization-controlled phase singularity even post-fabrication. The incident polarization angle can be utilized as a sensing index, which enables indirect and accurate measurement. The theoretical approach is experimentally validated using a general design of THz non-Hermitian metasurface sensors. Our method enhances robustness and sensitivity, opening new avenues for practical applications in ultra-sensitive sensing.
18 pages, 4 figures, 2 tables
References in corpus (13)
- Non-Hermitian Physics
- Ultrasensitive THz sensing with high-Q Fano resonances in metasurfaces
- Petermann-factor limited sensing near an exceptional point
- Optimizing Broadband Terahertz Modulation with Hybrid Graphene/Metasurface Structures
- Edge detection imaging by quasi-bound states in the continuum
- Observation of an exceptional point in a non-Hermitian metasurface
- Non-Hermitian engineering of terahertz light using exceptional points in electrically tuneable collective light-matter interactions
- Exceptional Photon Blockade: Engineering Photon Blockade with Chiral Exceptional Points
- Topological Modes in a Laser Cavity through Exceptional State Transfer
- Observation of Exceptional Points in Thermal Atomic Ensembles
- Crossing of the branch cut: the topological origin of a universal 2π-phase retardation in non-Hermitian metasurfaces
- Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial
- Adiabatic following of terahertz surface plasmon-polaritons based on tri-layered corrugated thin film coupler