Related Experiment Video
Updated: Sep 30, 2025
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
11.4K
Bound States in the Continuum in Compact Acoustic Resonators
Ilya Deriy1, Ivan Toftul1, Mihail Petrov1
1School of Physics and Engineering, ITMO University, 191002 St. Petersburg, Russia.
Physical Review Letters
|March 11, 2022
Summary
Finite-size acoustic resonators can host bound states in the continuum (BICs) localized within. Breaking resonator symmetry transforms BICs into quasi-BICs, appearing as high-Q Fano resonances for advanced acoustic devices.
Area of Science:
- Acoustics
- Solid-state physics
- Wave phenomena
Background:
- Acoustic resonators are crucial for wave manipulation.
- Bound states in the continuum (BICs) are unique wave phenomena with infinite theoretically localized states.
- Realizing BICs in finite-size structures is challenging.
Purpose of the Study:
- To theoretically demonstrate genuine bound states in the continuum (BICs) in finite-size solid acoustic resonators.
- To classify these BICs based on multipole characteristics.
- To investigate the transformation of BICs into quasi-BICs via symmetry breaking.
Main Methods:
- Development of a theoretical framework for acoustic BICs.
- Analysis of BICs in resonators of various geometries.
- Investigation of symmetry breaking effects on BIC properties.
Main Results:
- Demonstration of genuine BICs fully localized within finite-size solid acoustic resonators.
- Establishment of a multipole classification for these BICs.
- Observation that symmetry breaking converts BICs into quasi-BICs, appearing as high-Q Fano resonances.
Conclusions:
- Finite-size acoustic resonators can support localized BICs.
- Symmetry-broken resonators exhibit quasi-BICs with high-Q Fano resonances.
- These findings pave the way for enhanced acoustic devices, sensors, antennas, and topological acoustic structures.
Related Concept Videos
01:14Sound Waves: Resonance
2.7K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.7K
01:28Standing Waves in a Cavity
1.1K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.1K
01:19Concept of Resonance and its Characteristics
5.3K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.3K
01:26Resonance in an AC Circuit
2.2K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.2K
01:24Characteristics of Series Resonant Circuit
341
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
341
01:17Series Resonance
284
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
284