Related Experiment Video
Updated: Nov 15, 2025
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
14.8K
Propagative Oscillations in Codirectional Polariton Waveguide Couplers
J Beierlein1, E Rozas2, O A Egorov3
1Technische Physik, Wilhelm-Conrad-Röntgen Research Center for Complex Material Systems, and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Physical Review Letters
|March 5, 2021
Summary
Researchers developed new devices to guide exciton-polaritons, observing Josephson-like oscillations in a waveguide. This breakthrough enables controllable light-matter particle routing for future compact logic devices.
Area of Science:
- Quantum optics
- Condensed matter physics
- Nanophotonics
Background:
- Exciton-polaritons are light-matter quasiparticles formed by strong coupling between photons and excitons.
- Controlling the flow of exciton-polaritons is crucial for developing novel optical devices.
- Previous studies observed Josephson-like oscillations in coupled polariton traps, but not in waveguide systems.
Purpose of the Study:
- To create and investigate novel exciton-polariton routing devices.
- To demonstrate controllable guidance of exciton-polaritons in a waveguide architecture.
- To explore Josephson-like oscillation phenomena in a propagative waveguide system.
Main Methods:
- Fabrication of codirectional coupling devices with tunable waveguide coupling.
- Experimental observation of real-space oscillations of the exciton-polariton condensate.
- Systematic control of device parameters (gap width, channel length, propagation energy).
Main Results:
- Demonstrated tunable coupling between two adjacent waveguides via evanescent coupling.
- Observed Josephson-like oscillations of the exciton-polariton condensate in the waveguide device.
- Showcased controllable routing of polariton flow by adjusting device parameters.
Conclusions:
- The developed codirectional polariton device enables controllable routing of light-matter particles.
- This waveguide-based design mimics Josephson-like oscillations observed in polariton traps.
- The device serves as a passive, scalable coupler for compact, next-generation logic architectures.
More Related Videos
Related Concept Videos
01:07Propagation of Waves
2.6K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.6K
01:30Propagation Speed of Electromagnetic Waves
4.3K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.3K
01:30Oscillations In An LC Circuit
2.7K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.7K
01:28Induced Electric Dipoles
4.5K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.5K
01:31Dielectric Polarization in a Capacitor
5.5K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.5K
01:28Standing Waves in a Cavity
1.2K
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:
1.2K