Related Experiment Video
Updated: May 26, 2026
08:48
Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Realization of a distributed Bragg reflector for propagating guided matter waves
C M Fabre1, P Cheiney, G L Gattobigio
1Université de Toulouse, UPS, Laboratoire Collisions Agrégats Réactivité, IRSAMC, F-31062 Toulouse, France.
Physical Review Letters
|December 21, 2011
Summary
Researchers experimentally studied a Bragg reflector for Bose-Einstein condensates. Finite optical lattices selectively reflect matter wave packets, with Gaussian envelopes causing multiple reflections, advancing atom-optics integration.
Area of Science:
- Quantum physics
- Atomic, molecular, and optical (AMO) physics
Background:
- Bose-Einstein condensates (BECs) are quantum states of matter with unique wave-like properties.
- Controlling and manipulating BECs is crucial for developing advanced quantum technologies.
- Atom optics utilizes light to control atomic matter waves, analogous to traditional optics.
Purpose of the Study:
- To experimentally investigate the properties of a finite-length one-dimensional Bragg reflector for guided Bose-Einstein condensates.
- To analyze the influence of the optical lattice's Gaussian envelope on the reflection characteristics.
- To assess the potential for creating integrated atom-optics devices.
Main Methods:
- Experimental realization of a one-dimensional attractive optical lattice using red-detuned laser beams.
- Generation and propagation of Bose-Einstein condensates through the optical lattice.
- Quantitative comparison of experimental data with one-dimensional numerical simulations.
Main Results:
- Demonstration of selective reflection of specific velocity components of the BEC matter wave packet.
- Observation of multiple reflections due to the Gaussian envelope of the optical lattice.
- Quantitative agreement between experimental findings and numerical simulations.
Conclusions:
- A finite-length optical lattice can function as an effective Bragg reflector for Bose-Einstein condensates.
- The Gaussian envelope of the lattice significantly impacts the reflection dynamics, enabling complex wave packet behavior.
- This work represents a significant advancement towards building integrated atom-optics circuits for coherent matter waves.
Related Concept Videos
01:07Propagation of Waves
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...
01:07Reflection of Waves
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
01:28Standing Waves in a Cavity
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:
02:32The de Broglie Wavelength
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...