Non-diffractive space-time wave packets(nSTWPs) represent a broad class of optical pulses capable of propagating without diffraction or dispersion in linear media. In this work, we introduce a complete family of nSTWP...Non-diffractive space-time wave packets(nSTWPs) represent a broad class of optical pulses capable of propagating without diffraction or dispersion in linear media. In this work, we introduce a complete family of nSTWPs that remain invariant under transverse Lorentz boosts. The Lorentz-invariant behavior of these STWPs is rigorously analyzed through their associated spectral line function, providing new insights into their fundamental properties. Furthermore, we quantify the limitations of this invariance and compare the robustness of the proposed nSTWPs against conventional nSTWPs.展开更多
Topological physics exploits concepts from geometry and topology to implement systems capable of guiding waves in an unprecedented fashion.These ideas have led to the development of photonic topological insulators,whi...Topological physics exploits concepts from geometry and topology to implement systems capable of guiding waves in an unprecedented fashion.These ideas have led to the development of photonic topological insulators,which are optical systems whose eigenspectral topology allows the creation of light states that propagate along the edge of the system without any coupling into the bulk or backscattering even in the presence of disorder.Indeed,topological protection is a fully coherent effect,and it is not clear to what extent topological effects endure when the wavefronts become partially coherent.Here,we study the interplay of topological protection and the degree of spatial coherence of classical light propagating in disordered photonic topological insulators.Our results reveal the existence of a well-defined spectral window in which partially coherent light is topologically protected.This opens up the design space to a wider selection of light sources,possibly yielding smaller,cheaper,and more robust devices based on the topological transport of light.展开更多
文摘Non-diffractive space-time wave packets(nSTWPs) represent a broad class of optical pulses capable of propagating without diffraction or dispersion in linear media. In this work, we introduce a complete family of nSTWPs that remain invariant under transverse Lorentz boosts. The Lorentz-invariant behavior of these STWPs is rigorously analyzed through their associated spectral line function, providing new insights into their fundamental properties. Furthermore, we quantify the limitations of this invariance and compare the robustness of the proposed nSTWPs against conventional nSTWPs.
基金support by the Deutsche Forschungsgemeinschaft(DFG)within the framework of the DFG priority program 1839 Tailored Disorder(BU 1107/12-2,PE 2602/2-2).
文摘Topological physics exploits concepts from geometry and topology to implement systems capable of guiding waves in an unprecedented fashion.These ideas have led to the development of photonic topological insulators,which are optical systems whose eigenspectral topology allows the creation of light states that propagate along the edge of the system without any coupling into the bulk or backscattering even in the presence of disorder.Indeed,topological protection is a fully coherent effect,and it is not clear to what extent topological effects endure when the wavefronts become partially coherent.Here,we study the interplay of topological protection and the degree of spatial coherence of classical light propagating in disordered photonic topological insulators.Our results reveal the existence of a well-defined spectral window in which partially coherent light is topologically protected.This opens up the design space to a wider selection of light sources,possibly yielding smaller,cheaper,and more robust devices based on the topological transport of light.
