PTX-symmetric metasurfaces for sensing applications
| Autor: | Liang Zhu, Minye Yang, Pai-Yen Chen, Zhilu Ye |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
business.industry Scattering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials 010309 optics Amplitude modulation Transformation (function) 0103 physical sciences Optoelectronics Point (geometry) Gravitational singularity Sensitivity (control systems) Electrical and Electronic Engineering Photonics 0210 nano-technology business Scaling Research Article |
| Zdroj: | Front Optoelectron |
| ISSN: | 2095-2767 2095-2759 |
| Popis: | In this paper, we introduce an ultra-sensitive optical sensing platform based on the parity-time-reciprocal scaling (PTX)-symmetric non-Hermitian metasurfaces, which leverage exotic singularities, such as the exceptional point (EP) and the coherent perfect absorber-laser (CPAL) point, to significantly enhance the sensitivity and detectability of photonic sensors. We theoretically studied scattering properties and physical limitations of the PTX-symmetric metasurface sensing systems with an asymmetric, unbalanced gain-loss profile. The PTX-symmetric metasurfaces can exhibit similar scattering properties as their PT-symmetric counterparts at singular points, while achieving a higher sensitivity and a larger modulation depth, possible with the reciprocal-scaling factor (i.e., X transformation). Specifically, with the optimal reciprocal-scaling factor or near-zero phase offset, the proposed PTX-symmetric metasurface sensors operating around the EP or CPAL point may achieve an over 100 dB modulation depth, thus paving a promising route toward the detection of small-scale perturbations caused by, for example, molecular, gaseous, and biochemical surface adsorbates. [Image: see text] |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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