Dual-band polarization convertor based on electromagnetically induced transparency (EIT) effect in all-dielectric metamaterial

Circularly Polarized Manipulations with VO2‐Doped Dielectric Electromagnetically Induced Transparency and Absorption

“…S 11 (𝜔) and S 21 (𝜔) in Equation ( 18) are scattering coefficients for transmission and reflection apart, A(𝜔), T(𝜔), R(𝜔), in Equation (19) respectively represent the absorptance, transmittance, and reflectivity. Numerical solutions are displayed in Figure 24 implying the real and imaginary parts of Z eff .…”

“…In this scheme, the S parameters are listed from Equations ( 4)-( 7), and the AR band is employed to evaluate the performance of LCPC according to Equation ( 8). [19,33] Based on the AR plot (see Figure 9c), the deduced narrow converted-circular band spanning 1.350-1.379 THz, due to strong dispersion in MSS EIT (the relative bandwidth is 2.2%), holding a perfect circular output around 1.364 THz (AR = 0 dB). Two extra frequencies distributed aside from the narrow band are also observed that realizing circular-polarization conversions, otherwise, is worthless with low transmittance.…”

“…[50] but fails to achieve optical delay in the conversion state. The dual-band linear-to-circular polarization conversion (LCPC) induced via the asymmetric EIT responses under both modes has been revealed by Zhu et al [19] with potential in radomes, that is, an expansion of the atomic coherent cancellation [2,3] to the practical information competition of the military despite the low transmittance. Such EIT-based LCPC with a highly-transparent window and steep dispersion, suppresses the reflection lies in traditional transmissive polarization converters effectively and extends its potential in slow-light propagation.…”

“…Despite ref. [19] emphasizing the prospects for asymmetric coupling‐induced polarization under dual‐mode incidence, it lacks post‐processing for polarized waves, with mediocre transmitivity of the conversed circular‐polarized light. In other words, classical optical polarization rotators contribute merely fixed modulations of the wave phases within working frequencies with transmission losses.…”

Tuning Electromagnetically Induced Transparency of Superconducting Metamaterial Analyzed With Equivalent Circuit Approach

“…Their electromagnetic properties are mainly determined by the internal and specific structures. They can manipulate the propagation of electromagnetic waves, leading to many fascinating electromagnetic phenomena, such as EIT [7][8][9][10], Fano resonance [11,12], and chirality [13][14][15]. These new properties greatly extend the research scope of metamaterial and can find many new interesting applications in polarization control, giant optical activity, asymmetric EM wave propagation, quantum information process, and biosensors.…”