Observing Relative Homotopic Degeneracy Conversions with Circuit Metamaterials.

Making nodal lines (NLs) deterministic is quite challenging because directly probing them requires bulk momentum resolution. Here, based on the general scattering theory, we show that the Bloch modes of the circuit metamaterials can be selectively excited with a proper source. Consequently, the transport measurement for characterizing the circuit band structure is momentum resolved.

In vivo MRI of knee using a metasurface-inspired wireless coil.

Purpose: To investigate the application of a metasurface-inspired wireless coil and evaluate its performance in clinical knee MRI.

Methods: A metasurface surface coil is designed for knee MRI at 1.5T.

Adaptive Cylindrical Wireless Metasurfaces in Clinical Magnetic Resonance Imaging.

The signal-to-noise ratio (SNR) is one of the most important criteria for evaluating the image quality in magnetic resonance imaging (MRI), and metasurfaces with unique electromagnetic properties provide a novel method for SNR improvement. However, their applications in clinical MRI are highly restricted by the inhomogeneous enhancement of the magnetic field and interference in the radio frequency (RF) transmitting field. In this study, an adaptive cylindrical wireless metasurface (ACWM) with homogeneous field enhancement and adaptive resonant modes is reported.

Energy Band Attraction Effect in Non-Hermitian Systems.

The energy band attraction (EBA) caused by the nonorthogonal eigenvectors is a unique phenomenon in the non-Hermitian (NH) system. However, restricted by the required tight-binding approximation and meticulously engineered complex potentials, such an effect has never been experimentally demonstrated before. Here by a suitable design of all-dielectric Mie resonators in a parallel-plate transmission line, we for the first time verify the photonic analog of the EBA effects both theoretically and experimentally.