Handedness Dependent Electromagnetically Induced Transparency in Hybrid Chiral Metamaterials

Abstract

We provide the first experimental demonstration of the handedness dependent electromagnetically induced transparency (EIT) in chiral metamaterials during the interaction with circularly polarized waves. The observed chiral-sensitive EIT phenomena arise from the coherent excitation of a non-radiative mode in the component split ring resonators (SRRs) produced by the corresponding Born−Kuhn type (radiative) resonators that are responsible for the pronounced chirality. The coherent coupling, which is dominated by the bonding and antibonding resonances of the Born−Kuhn type resonators, leads to an extremely steep dispersion for a circularly polarized wave of predefined handedness. Accordingly, retrieved effective medium parameters from simulated results further reveal a difference of 80 in the group indices for left- and right-handed circularly polarized waves at frequencies within the EIT window, which can potentially result in handedness-sensitive pulse delays. These chiral metamaterials which enable a handedness dependent EIT effect may provide more degrees of freedom for designing circular polarization based communication devices.

Enhanced photon drag in closed-loop quantum systems

“…Controlling group velocity of light has been another object of quickly growing attention in the last few years. Up to now, numerous experimental and theoretical works have been devoted to control group velocity of light in materials such as atomic medium [35], dielectric medium [36], optomechanical system [37,38], chiral metamaterials [39], and Landau-quantized graphene [40]. Slow light propagation can be treated as a highly promising tool for realizing controllable optical delay lines, optical buffers, spectrometers with enhanced spectral resolution and optical memories.…”

Analog electromagnetically induced transparency for circularly polarized wave using three-dimensional chiral metamaterials

“…An analytical coupled oscillator model is applied to reproduce the transparency spectra that enhance the understanding of the underlying mechanism. Compared with previous work [27], the proposed structure provided an alternative simple and efficient solution to tailor the EIT-like phenomenon in metamaterial for CP waves.…”

“…However to the author's knowledge, the EIT-like metamaterial for circular polarization wave is not thoroughly studied. Only very recently, the authors demonstrate the EIT effect of circularly polarized waves using Born-Kuhn type resonators mixed with split ring resonators [27]. Meanwhile, most EIT-metamaterials make use of symmetry breaking "meta-atoms" on a planar to engineer the "dark mode" and "bright mode" interference [28,29].…”

Birefringence of rotary photon drags through induced chiral atomic medium

“…Circularly birefringent medium give rise to a variety of interesting optical effects in addition to the well known one of optical activity [17]. Circular birefringence is optically controlled in a spinning chiral medium which might help to understand the image designing and image coding [18]. Furthermore, coherent control of a circular birefringence in a chiral medium was also investigated by Anwar et al [7].…”