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Unidirectional scattering with spatial homogeneity using correlated photonic time disorder

Cited 5 time in Web of Science Cited 5 time in Scopus

Kim, Jungmin; Lee, Dayeong; Yu, Sunkyu; Park, Namkyoo

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Nature Publishing Group
Nature Physics, Vol.19 No.5, pp.726-732
Photonic systems can exploit time as a degree of freedom analogous to space, eliminating the need for spatial patterning to achieve functionality. A Green's function approach allows the design of disordered time scatterers with desired properties. Recently, there has been increasing interest in the temporal degree of freedom in photonics due to its analogy with spatial axes, causality and open-system characteristics. In particular, the temporal analogues of photonic crystals have allowed the design of momentum gaps and their extension to topological and non-Hermitian photonics. Although recent studies have also revealed the effect of broken discrete time-translational symmetry in view of the temporal analogy of spatial Anderson localization, the broad intermediate regime between time order and time uncorrelated disorder has not been examined. Here we theoretically investigate the inverse design of photonic time disorder to achieve optical functionalities in spatially homogeneous platforms. By developing the structure factor and order metric using causal Green's functions for disorder in the time domain, we propose an engineered time scatterer, which provides unidirectional scattering with controlled scattering amplitudes. We also show that the order-to-disorder transition in the time domain allows the manipulation of scattering bandwidths, which makes resonance-free temporal colour filtering possible. Our work could advance optical functionalities without spatial patterning.
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  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area Disordered, Open-System Wave Mechanics, Photonic AI Systems, Photonic Neuromorphic Devices, 광학 뉴로모픽 소자, 광학 인공지능 시스템, 무질서, 열린계 파동역학


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