“…In particular, the electromagnetic response of the metamolecule is governed by the displacement currents induced in each dielectric cylinder and central scatterer by an impinging electromagnetic wave, with the E-field directed along the cylinder’s axis (TM polarization). The relative permittivity of the four all-dielectric cylinders is ε r = 41.4 which is very close to the dielectric constant of LiTaO 3 in the low THz regime 58 , 59 . Figure 1 Illustration of the multipolar cloaking metamolecule, consisting of four dielectric and one central PEC cylinders.…”
In this paper, we demonstrate the relation between cloaking effect and its nonradiating state by considering the destructive multipolar interaction between near-field scattering by bare object and surrounding coating located in its proximity. This cloaking effect is underpinned by anapole mode excitation and it occurs as destructive interference between the electric dipole moment, generated by a bare object (here a central metallic scatterer) and the toroidal moment, formed inside the cloak (a surrounding cluster of dielectric cylinders). Numerical results show how a cloaking effect based on the formation of the anapole mode can lead to an overall nonradiating metamolecule with all-dielectric materials in the coating region.
“…In particular, the electromagnetic response of the metamolecule is governed by the displacement currents induced in each dielectric cylinder and central scatterer by an impinging electromagnetic wave, with the E-field directed along the cylinder’s axis (TM polarization). The relative permittivity of the four all-dielectric cylinders is ε r = 41.4 which is very close to the dielectric constant of LiTaO 3 in the low THz regime 58 , 59 . Figure 1 Illustration of the multipolar cloaking metamolecule, consisting of four dielectric and one central PEC cylinders.…”
In this paper, we demonstrate the relation between cloaking effect and its nonradiating state by considering the destructive multipolar interaction between near-field scattering by bare object and surrounding coating located in its proximity. This cloaking effect is underpinned by anapole mode excitation and it occurs as destructive interference between the electric dipole moment, generated by a bare object (here a central metallic scatterer) and the toroidal moment, formed inside the cloak (a surrounding cluster of dielectric cylinders). Numerical results show how a cloaking effect based on the formation of the anapole mode can lead to an overall nonradiating metamolecule with all-dielectric materials in the coating region.
“…This allows manufacture of optical radiation converters on periodically polarized structures on the base of lithium tantalate crystals. A possibility to modify LiTaO3 properties by doping with different elements makes this material one of the most perspective and attracts attention of numerous researchers [6][7][8][9][10][11][12][13][14]. Doping of LiTaO3 single crystals with rare-earth elements is of great interest.…”
A method was developed for synthesis of a single phase lithium tantalate charge doped by rare earth elements (TR) from highly pure solutions containing tantalum. The method is based on obtaining and thermal treatment of citrate precursor containing Li, Ta and TR. Charge samples were obtained due to suggested technological scheme; the dopant had given concentration and was chemically uniformly distributed. The charge can be applied both in single crystal growing technology and at obtaining of functional ceramics based on LiTaO3:TR.
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