Frequency and Polarization Transformer (10 GHz to 1000 GHz): Interaction of a Whistler Wave With a Collapsing Plasma in a Cavity

Wave deflection and shifted refocusing in a medium modulated by a superluminal rectangular pulse

“…Shortly later, Felsen noted that a temporal step modulation refocusses reflected waves back to their source position 11 , which was recently experimentally demonstrated with an acoustic wave in 12 . Kalluri addressed the problem of temporal modulation in plasmas; he published a textbook on the topic 13 and recently reported the application of a microwave to terahertz frequency and polarization transformer 14 . Finally, Halevi theoretically studied periodic temporal media 15 and experimentally demonstrated them in microwave transmission lines loaded by time-modulated varactors 16 .…”

Spacetime Metamaterials Perspectives

“…VI-B and VII-B), and not only without any spurious harmonics and unrestricted efficiency, but also with arbitrary anharmonic conversion ratios, α = n 1 /n 2 [Eq. (33b)], depending only on the electromagnetic densities of the two involved media [100]. Alternatively, multiplication can be accomplished by a spacetime medium (e.g.…”

Microwave frequency downshift in the time-varying collision plasma

“…As for the interaction between EM waves and the timevarying plasma, the frequency upshift is widely known. For example, a more perfect theoretical analysis is proposed by Kalluri [19,20], the particle-in-cell (PIC) simulation verification is demonstrated by Chen [21,22], and several proofof-principle experiments are reported by Kuo [23] and Nishida [24,25]. Nevertheless, the frequency downshift of EM waves in the time-varying collision plasma is disregarded.…”