Acoustic resonances in open systems, which are usually associated with resonant modes
characterized by complex eigenfrequencies, play a fundamental role in manipulating …

Exceptional points are complex branching singularities of non-Hermitian bands that have
lately attracted considerable interest, particularly in non-Hermitian photonics. In this article …

Tunable acoustic metamaterials have excellent sound waves control and manipulation
properties because of their deformations under different stimuli. Pneumatic actuation has …

Bound states in the continuum (BICs) have attracted increasing interest in recent years
owing to their intriguing physical characteristics such as the infinitely high quality factor (Q …

Bound states in the continuum (BICs) have attracted much attention in the field of
nanophotonics owing to their ability to trap photons without loss. Recently, a low-refractive …

The confinement of waves in open systems represents a fundamental phenomenon
extensively explored across various branches of wave physics. Recently, significant …

The microcavity in the form of a liquid crystal defect layer embedded in a one-dimensional
photonic crystal is considered. The microcavity mode has a tunable radiation decay rate in …

Bound states in the continuum (BICs) are wave modes that remain in the continuous
spectrum of radiating waves that carry energy; however, they remain perfectly localized and …