The temporal Talbot effect refers to the periodic revivals of a pulse train propagating in dispersive medium and is analog spatial with group-velocity dispersion time replacing diffraction space. Because typically large lengths, this has been observed date only single-mode fibers, rather than freely fields bulk media. Here we demonstrate for first time, best our knowledge, free space by employi...

As much a rapidly evolving cultural signifier as viral materiality, COVID-19 has not biologically penetrated every national border. It is, however, transforming the interpretation, understanding, and experience of place in absence infection. One role for geographers is to analyse how material manifesting spatially beyond closed borders. More specifically, are particular places becoming meaningf...