Chirality and Negative Refraction without Absorption in the Optical Domain Using Electromagnetically Induced Transparency

Shun‐Cai Zhao, Qixuan Wu, Ailing Gong

Jürgen Kästel, Michael Fleischhauer, Susanne F. Yelin +1 more

We show that negative refraction with minimal absorption can be obtained by means of quantum interference effects similar to electromagnetically induced transparency (EIT). Coupling a magnetic dipole transition coherently with an electric dipole transition leads to electromagnetically induced chirality, which can provide negative refraction without requiring negative permeability and also suppress absorption. This technique allows negative refraction in the optical regime at densities where the magnetic susceptibility is still small and with refraction/absorption ratios that are orders of magnitude larger than those achievable previously. Furthermore, the refractive index can be fine-tuned, which is essential for practical realization of subdiffraction-limit imaging. As with EIT, electromagnetically induced chirality should be applicable to a wide range of systems.

Changqing Wang, Xuefeng Jiang, Guangming Zhao +6 more

Susanne F. Velin, Jürgen Kästel, Michael Fleischhauer +1 more

Negative refraction with minimal absorption can be obtained using quantum interference effects similar to electromagnetically induced transparency (EIT). Coupling a magnetic dipole transition coherently with an electric dipole transition leads to electromagnetically induced chirality, which can provide negative refraction.

Antonios Fountoulakis, Andreas Terzis, Emmanuel Paspalakis

Muhammad Safeer Sadiq, Fazal Ghafoor

This paper investigates the microwave-synchronized fine-tuning of electromagnetically induced chirality in a four-level atomic system. The system is driven by two optical fields and one microwave field in an extended double-Λ configuration. Under low-density conditions, the system exhibits double electromagnetically induced transparency (EIT), which can be controlled by adjusting the amplitudes of coupling fields and the phase of the microwave field. We show that, under suitable conditions of the coupling field amplitudes and microwave phase, the double EIT reduces to a single EIT as a result of multi-path quantum interference. These optical processes are elucidated using dressed-state analysis. In this context, we also examine the magnetic susceptibility and chiral coefficients. Furthermore, by incorporating local-field corrections for a high-density medium, we demonstrate broadband absorption-free negative refraction of the probe field, where neither the effective permittivity nor the permeability is required to be simultaneously negative.