Related Experiment Video
Updated: Jun 20, 2026
04:54
A Stable Phantom Material for Optical and Acoustic Imaging
Published on: June 16, 2023
Diffraction of light by acoustic waves on a membrane.
1US Department of Defense, Fort Meade, Maryland 20755, USA.
Optics Letters
|August 25, 2009
Summary
Researchers demonstrate light diffraction by acoustic waves on a membrane, enabling acousto-optic signal processing at lower frequencies than standard Bragg cells and supporting parallel-array data processing.
Area of Science:
- Optics and Photonics
- Acousto-Optics
- Materials Science
Background:
- Standard acousto-optic cells have limitations in handling low-frequency signals.
- Acousto-optic devices are crucial for signal processing applications.
Purpose of the Study:
- To report the diffraction of light by acoustic waves on a membrane.
- To introduce a novel device for acousto-optic signal processing at lower frequencies.
- To demonstrate acoustic waveguiding phenomena and parallel-array data processing capabilities.
Main Methods:
- Utilizing a membrane to interact light with acoustic waves.
- Investigating diffraction patterns generated by acoustic waves.
- Demonstrating waveguiding of acoustic signals on the membrane.
Main Results:
- Observed diffraction of light by acoustic waves on a membrane.
- Achieved acousto-optic signal processing at significantly lower frequencies compared to traditional Bragg cells.
- Demonstrated acoustic waveguiding phenomena.
- Showcased the device's capability for simultaneous parallel-array data processing.
Conclusions:
- The developed membrane-based device offers a new approach for low-frequency acousto-optic signal processing.
- The device exhibits acoustic waveguiding and parallel processing capabilities, expanding the potential applications of acousto-optics.
More Related Videos
Related Concept Videos
02:18Interference and Diffraction
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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:
00:53Sound Waves: Interference
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
02:18X-ray Crystallography
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
01:01Sound Waves
Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well. Hence,...
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well. Hence,...