Exceptional points of PT-symmetric reflectionless states in complex scattering systems
arXiv:2111.06275 · doi:10.1103/PhysRevLett.128.203904
Abstract
We investigate experimentally and analytically the coalescence of reflectionless (RL) states in symmetric complex wave-scattering systems. We observe RL-exceptional points (EPs), first, with a conventional Fabry-Perot system for which the scattering strength within the system is tuned symmetrically, and then with single- and multi-channel symmetric disordered systems. We identify that an EP of the parity-time (PT)-symmetric RL-operator is obtained when the spacing between central frequencies of two natural resonances of the system is equal to the decay rate into incoming and outgoing channels. Finally, we leverage the transfer functions associated with RL and RL-EPs states to implement first- and second-order analog differentiation.
References in corpus (13)
- Coherent Perfect Absorbers: Time-reversed Lasers
- Observation of coherent perfect absorption at an exceptional point
- Meta-Programmable Analog Differentiator
- Random Matrix Theory Approach to Chaotic Coherent Perfect Absorbers
- Coherent wave control in complex media with arbitrary wavefronts
- Transmission zeros and ultrasensitive detection in complex systems
- Towards a Broad-Band Coherent Perfect Absorption in systems without Scale-Invariance
- On-demand coherent perfect absorption in complex scattering systems: time delay divergence and enhanced sensitivity to perturbations
- Unified theory of resonances and bound states in the continuum in Hermitian tight-binding models
- Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies
- Generalization of Wigner Time Delay to Sub-Unitary Scattering Systems
- Reflectionless excitation of arbitrary photonic structures: A general theory
- Mean path length invariance in wave-scattering beyond the diffusive regime
Cited by in corpus (14)
- Reflectionless Programmable Signal Routers
- Generalized Drude-Lorentz Model Complying with the Singularity Expansion Method
- Poles and zeros in non-Hermitian systems: Application to photonics
- Optical Limiter Based on PT-Symmetry Breaking of Reflectionless Modes
- Analytical Modeling of Acoustic Exponential Materials and Physical Mechanism of Broadband Anti-Reflection
- Robust incoherent perfect absorption
- Liouvillian exceptional points in continuous variable system
- Nonlinearity-induced Scattering Zero Degeneracies for Spectral Management of Coherent Perfect Absorption in Complex Systems
- Unidirectional exceptional point of reflectionless states in a magnonic mirror array
- Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces
- Robustness of perfect transmission resonances to asymmetric perturbation
- Superuniversal Statistics with Topological Origins for non-Hermitian Scattering Singularities
- Arbitrary-Order Scattering Exceptional Points in Configurable Non-Hermitian Zero-Index Materials
- Impact of noise on nonlinear-exceptional-point-based sensors