Surface-standing-wave formation via resonance interaction of a finite-length conductive rod with microwaves

Abstract

The resonant response of a thin conducting rod with a finite length irradiated by microwaves polarized along its axis is observed. By using a thermoelastic optical indicator microscope it is shown that rod with a length of several half-wavelengths can serve as a resonator for axial surface waves. It is facilitated by noticeable reflections (approximately 30%) from the rod edges conditioned by the unique distributions of Sommerfeld wave fields along a rod. The presence of a weak axial electric field component of surface waves ensures an easy coupling with the incident plane wave polarized along the rod axis and excites the resonator. Visualization of distributions of the near-field magnetic component of surface standing waves in the vicinity of a rod allows the exploration of three longitudinal modes of a resonator with low orders. The possibility of controlling the resonant frequency by changing the length and diameter of the rod, as well as the electromagnetic characteristics of the environment, are studied. The phenomenon under study can be used to create wavefront shaping metasurfaces and for studies of the properties of a dielectric medium in the microwave region. As Sommerfeld waves propagate on the surface of a cylindrical resonator, the resonant properties are sensitive to the dielectric permittivity of the surrounding medium, which will open up the potential for using the suggested resonator in sensing applications, which is experimentally demonstrated.

Dielectric coated conductive rod resonantly coupled with a cut transmission line as a tunable microwave bandstop filter and sensor

“…The visualization of microwave magnetic near-field (MMNF) by the TEOIM revealed unique properties of the interaction of a finite-length conductive rod with microwaves [ 23 , 24 ]. Particularly, Cu rods with a height of multiple half-wavelengths support Sommerfeld standing waves formed on the Cu/air interface.…”

Highly dispersive transmission conditions for a conductive rods-based ultrathin bilayer metastructure

“…Here, we combined the half-wavelength thin metallic rods with BMS architecture to engineer controllable and extremely dispersive electromagnetic properties. The resonant coupling in such a structure originates from the capability of these nearly half-wavelength rods to support surface standing waves with axial symmetry [24]. Leveraging the surfacebound nature of these modes, a strong interaction is ensured between each rod in one layer with two adjacent rods in the other arising due to the redistribution of charges, whereas the interaction between the rods in a single layer is relatively weak.…”

The appearance of standing wave structures in the reaction medium during the diffusion development of the chain reaction process

“…Moreover, recent studies of these authors shed light on how pulsation phenomena can occur as a result of the interaction of the intermediates with concentrated ionic complexes near the surface, resulting in the generation of subtle shock waves [2]. Such discoveries as T. Abrahamyan et al, have profound implications not only for the operational integrity and efficiency of reactors using chain processes, but also for basic scientific research aimed at mastering these complex processes [3]. Oscillatory phenomena, including concentration and temperature fluctuations, are key issues in the field of industrial chain processes.…”