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Electromagnetic wave induced forces have been extensively studied for decades. It has been well known that for an electromagnetic wave propagating in vacuum the photons carrying momentum exert a positive photon pressure on an object. However, a metamaterial can have a negative effective refractive index, in which case the wave vector is directed towards the source of radiation. In such a medium, should...
Electromagnetic wave or light-induced forces have been extensively studied for decades. It has been well known that for an electromagnetic wave propagating in vacuum the photons carrying momentum ħk exert a positive photon pressure on an object. However, in a metamaterial with a negative refractive index, the wave vector k is directed towards the source of radiation. In this case, should electromagnetic...
It is always a challenge to realize extreme and unusual values of refractive index for a broad range of frequencies. We show that when water is covered by a thick, rigid and unmovable plate, it behaves like a medium with zero refractive index for water waves at any frequency. Hence, by covering water with a plate of a concave or rectangular shape, water waves can be focused or collimated in a broad...
Non-Hermitian systems, such as open systems and systems with asymmetric losses, are ubiquitous in nature and have drawn a lot of attentions for a long time. The exceptional points (EPs) that can exist in such systems when two eigenstates coalesce are the origin of a wide range of novel phenomena in different branches of physics. Most of these phenomena can be understood by considering a 2 × 2 non-Hermitian...
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