Phys.org  August 27, 2024 The exceptional point, a spectral singularity widely existing in non-Hermitian systems, provides an indispensable route to enhance the sensitivity of optical detection. However, the exceptional point of the systems is set once the system is built or fabricated, and machining errors make it hard to reach such a state precisely. An international team of researchers (China, Spain, Singapore) developed a highly tunable and reconfigurable exceptional point system, i.e., a single spoof plasmonic resonator suspended above a substrate and coupled with two freestanding Rayleigh scatterers. Their design offered great flexibility to control exceptional point states, enabling them […]