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In-situ Time-domain Physical Adjoint Optimization of Complex Wave Dynamics
Hoyeong Kwon, Arunn Suntharalingam, Laureano Bulus-Rossini +1
Direct optimization of complex wave dynamics through the intrinsic evolution of physical systems is fundamentally limited by the lack of directly accessible gradients. Adjoint meth…
In-situ adjoint protocols for nonlinear PT-symmetric self-optimizing machines
Zheming Li, Lucas J. Fernández-Alcázar, Zin Lin +1
Adjoint methods provide a powerful route for gradient-based optimization, but their physical implementation is obstructed in generic nonlinear systems because the adjoint dynamics…
In-situ Adjoint Wave Control in Reconfigurable Non-Hermitian Nonlinear Systems
John Guillamon, William Tuxbury, Cheng-Zhen Wang +3
Complex multipath environments are usually avoided in wave-based information processing because repeated scattering creates many interfering propagation paths, obscuring controllab…
Observed enhanced emission at higher-order exceptional points in RF circuits
Nicolas Wyszkowski, Arunn Suntharalingam, Max Vitek +3
The Purcell effect -- stemming directly from the celebrated Fermi's Golden Rule -- links the enhanced emissivity of an emitter to the local density of states (LDoS) of a surroundin…
Synthetic Reflectionless Mode Exceptional Degeneracies via Emergent Local Symmetries
William Tuxbury, Lucas Fernandez-Alcazar, Tsampikos Kottos
We propose a new kind of physically realizable exceptional point degeneracies (EPDs) corresponding to synthetic reflectionless modes (SRM). These are solutions of an auxiliary wave…
Optimal Targeted Mode Transport in Complex Wave Environments: A Universal Statistical Framework
Cheng-Zhen Wang, John Guillamon, Ulrich Kuhl +4
Recent advances in the field of structured waves have resulted in sophisticated coherent wavefront shaping schemes that provide unprecedented control of waves in various complex se…
Non-Conventional Thermal States of Interacting Bosonic Oligomers
Amichay Vardi, Alba Ramos, Tsampikos Kottos
There has recently been a growing effort to understand in a comprehensive manner the physics and intricate dynamics of many-body and many-state (multimode) interacting bosonic syst…
Unidirectional Amplification in the Frozen Mode Regime Enabled by a Nonlinear Defect
Serena Landers, William Tuxbury, Ilya Vitebskiy +1
A stationary inflection point (SIP) is a spectral singularity of the Bloch dispersion relation of a periodic structure where the first and the second derivatives of with…
Nonlinearity-induced Scattering Zero Degeneracies for Spectral Management of Coherent Perfect Absorption in Complex Systems
Cheng-Zhen Wang, John Guillamon, William Tuxbury +2
We develop a Coherent Perfect Absorption (CPA) protocol for cases where scale invariance is violated due to the presence of nonlinear mechanisms. We demonstrate, using a microwave…
Optical Kinetic Theory of Nonlinear Multi-mode Photonic Networks
Arkady Kurnosov, Lucas J. Fernández-Alcázar, Alba Y. Ramos +2
Recent experimental developments in multimode nonlinear photonic circuits (MMNPC), have motivated the development of an optical thermodynamic theory that describes the equilibrium…
Bound states in the continuum induced via local symmetries in complex structures
Cheng-Zhen Wang, Ulrich Kuhl, Adin Dowling +2
Bound states in the continuum (BICs) defy conventional wisdom that assumes a spectral separation between propagating waves, that carry energy away, and spatially localized waves co…
Nonlinear Wavepacket Dynamics in Proximity to a Stationary Inflection Point
Serena Landers, Arkady Kurnosov, William Tuxbury +2
A stationary inflection point (SIP) in the Bloch dispersion relation of a periodic waveguide is an exceptional point degeneracy where three Bloch eigenmodes coalesce forming the so…
Optical Limiter Based on PT-Symmetry Breaking of Reflectionless Modes
F. Riboli, R. Kononchuk, F. Tommasi +8
The application of parity-time (PT) symmetry in optics, especially PT-symmetry breaking, has attracted considerable attention as a novel approach to controlling light propagation.…
Universalities of Asymmetric Transport in Nonlinear Wave Chaotic Systems
Cheng-Zhen Wang, Rodion Kononchuk, Ulrich Kuhl +1
The intrinsic dynamical complexity of classically chaotic systems enforces a universal description of the transport properties of their wave-mechanical analogues. These universal r…
Controlling Optical Beam Thermalization via Band-Gap Engineering
Cheng Shi, Tsampikos Kottos, Boris Shapiro
We establish dispersion engineering rules that allow us to control the thermalization process and the thermal state of an initial beam propagating in a multimode nonlinear photonic…
Implementation of Optimal Thermal Radiation Pumps using Adiabatically Modulated Photonic Cavities
Lucas J. Fernández-Alcázar, Huanan Li, Mona Nafari +1
We numerically implement the concept of thermal radiation pumps in realistic photonic circuits and demonstrate their efficiency to control the radiation current, emitted between tw…
Thermal Motors with Enhanced Performance due to Engineered Exceptional Points
Lucas J. Fernández-Alcázar, Rodion Kononchuk, Tsampikos Kottos
A thermal current, generated by a temperature gradient between two reservoirs coupled to a carefully designed photonic or (micro-) electromechanical circuit, might induce non-conse…
Coherent virtual absorption of light in microring resonators
Q. Zhong, L. Simonson, T. Kottos +1
Light trapping and radiation process from linear reciprocal photonic resonators is one of the fundamental processes in optical science and engineering. Recently, the concept of coh…
Light-induced optical switching in an asymmetric metal-dielectric microcavity with phase-change material
R. Thomas, A. A. Chabanov, I. Vitebskiy +1
We propose an infrared power switch based on an asymmetric high-Q microcavity incorporating a metallic nanolayer in close proximity to a layer made of a phase-change material (PCM)…
Adiabatic Thermal Radiation Pumps for Thermal Photonics
Huanan Li, Lucas J. Fernández-Alcázar, Fred Ellis +2
We control the direction and magnitude of thermal radiation, between two bodies at equal temperature (in thermal equilibrium), by invoking the concept of adiabatic pumping. Specifi…
Unidirectional Photonic Circuit with Phase-Change Fano Resonator
Roney Thomas, Eleana Makri, Tsampikos Kottos +2
We demonstrate that the integration of a phase-change material (PCM) in one of the two microresonators of a photonic metamolecule, coupled to a bus waveguide, can lead to unidirect…
Floquet Perfect Absorbers based on Periodically Driven Targets
Dashiell Halpern, Suwun Suwunnarat, Huanan Li +2
We introduce the concept of multichannel Floquet Perfect Absorbers (FPAs) which are periodically modulated lossy interferometric traps that completely absorb incident monochromatic…
Statistical Description of Transport in Multimode Fibers with Mode-Dependent Loss
P. Chiarawongse, H. Li, W. Xiong +3
We analyze coherent wave transport in a new physical setting associated with multimode wave systems where reflection is completely suppressed and mode-dependent losses together wit…
Floquet Protocols of Adiabatic State-Flips and Re-Allocation of Exceptional Points
Dashiell Halpern, Huanan Li, Tsampikos Kottos
We introduce the notion of adiabatic state-flip of a Floquet Hamiltonian associated with a non-Hermitian system that it is subjected to two driving schemes with clear separation of…