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Related Concept Videos

Interference and Diffraction02:18

Interference 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.
Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Propagation of Waves01:07

Propagation 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...
Sound Waves: Interference00:53

Sound 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...
Standing Waves in a Cavity01:28

Standing 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:
Reflection of Waves01:07

Reflection 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...

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A Stable Phantom Material for Optical and Acoustic Imaging
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Published on: June 16, 2023

Light diffraction efficiency of acoustic surface waves.

P Zory, C Powell

    Applied Optics
    |January 30, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study measured light diffraction efficiency using acoustic surface waves on crystalline quartz. Highest efficiencies are a few percent, except in specific Bragg diffraction configurations, impacting light deflection devices.

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    Published on: July 26, 2016

    Area of Science:

    • Optoelectronics
    • Acousto-optics
    • Materials Science

    Background:

    • Acoustic surface waves (ASWs) are crucial for acousto-optic devices.
    • Understanding light diffraction efficiency is key for device performance.
    • Previous studies lacked comprehensive angular dependence data for ASW diffraction.

    Purpose of the Study:

    • To measure and analyze the angular dependence of light diffraction efficiency by ASWs on crystalline quartz.
    • To compare diffraction efficiencies with those on Lithium Niobate (LiNbO3).
    • To assess the implications for practical light deflection device design.

    Main Methods:

    • Experimental measurement of light diffraction efficiency as a function of angle.
    • Utilized crystalline quartz and LiNbO3 as substrates for ASW generation.
    • Analyzed diffraction patterns under varying acoustic and optical conditions.

    Main Results:

    • Angular dependence of light diffraction efficiency was systematically measured.
    • Maximum diffraction efficiencies were found to be approximately a few percent.
    • Exception noted for specific configurations enabling Bragg diffraction.

    Conclusions:

    • Current ASW diffraction efficiencies are limited to a few percent.
    • Bragg diffraction offers significantly higher efficiencies in specialized setups.
    • Findings provide critical data for optimizing acousto-optic light deflection devices.