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Superradiant Droplet Emission from Parametrically Excited Cavities.
Valeri Frumkin1, John W M Bush1, Konstantinos Papatryfonos2
1Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|February 24, 2023
Summary
Researchers discovered a hydrodynamic superradiance phenomenon where coupled cavities spontaneously emit droplets. This cooperative droplet emission rate exceeds individual rates and varies sinusoidally with cavity distance, mimicking optical superradiance.
Area of Science:
- Fluid dynamics
- Hydrodynamics
- Nonlinear dynamics
Background:
- Superradiance is a quantum optical phenomenon involving cooperative spontaneous emission.
- This phenomenon enhances photon emission rates in atomic systems.
- Understanding analogous phenomena in other physical systems can reveal universal principles.
Purpose of the Study:
- To investigate a hydrodynamic analogue of optical superradiance.
- To demonstrate cooperative droplet emission in coupled cavities.
- To characterize the relationship between emission rate and cavity coupling.
Main Methods:
- Utilizing a hydrodynamic system with two vibrationally excited cavities.
- Coupling the cavities through their shared wave field.
- Analyzing droplet emission via interfacial fracture.
- Measuring and comparing emission rates of coupled versus isolated cavities.
Main Results:
- Demonstrated spontaneous droplet emission from coupled cavities.
- Observed an amplified droplet emission rate in the coupled system compared to isolated cavities.
- Found that the amplified emission rate exhibits a sinusoidal dependence on the distance between cavities.
- This behavior mirrors characteristics of optical superradiance.
Conclusions:
- Presented a novel hydrodynamic phenomenon analogous to optical superradiance.
- Hydrodynamic superradiance in droplet emission is driven by cooperative effects in coupled cavities.
- The findings suggest that superradiance principles may apply across different physical domains.
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