Diffraction

Diffraction refers to various phenomena which occur when a wave encounters an obstacle. In classical physics, the diffraction phenomenon is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings. Similar effects occur when a light wave travels through a medium with a varying refractive index, or a sound wave travels through one with varying acoustic impedance. Diffraction occurs with all waves, including sound waves, water waves, and electromagnetic waves such as visible light, X-rays and radio waves. As physical objects have wave-like properties (at the atomic level), diffraction also occurs with matter and can be studied according to the principles of quantum mechanics. Italian scientist Francesco Maria Grimaldi coined the word "diffraction" and was the first to record accurate observations of the phenomenon in 1665.

Richard Feynman said that

"no-one has ever been able to define the difference between interference and diffraction satisfactorily. It is just a question of usage, and there is no specific, important physical difference between them."

He suggested that when there are only a few sources, say two, we call it interference, as in Young's slits, but with a large number of sources, the process be labelled diffraction.

While diffraction occurs whenever propagating waves encounter such changes, its effects are generally most pronounced for waves whose wavelength is roughly similar to the dimensions of the diffracting objects. If the obstructing object provides multiple, closely spaced openings, a complex pattern of varying intensity can result. This is due to the superposition, or interference, of different parts of a wave that travels to the observer by different paths (see diffraction grating).

The formalism of diffraction can also describe the way in which waves of finite extent propagate in free space. For example, the expanding profile of a laser beam, the beam shape of a radar antenna and the field of view of an ultrasonic transducer can all be analysed using diffraction equations.

Read more about Diffraction:  Examples, History, Mechanism, Patterns, Particle Diffraction, Bragg Diffraction, Coherence

Other articles related to "diffraction":

Coherent Diffraction Imaging
... diffractive imaging (CDI) also coherent diffraction imaging is a “lensless” technique for 2D or 3D reconstruction of the image of nanoscale ... to convert from the reciprocal space diffraction pattern into a real space image ... lenses is that the final image is aberration–free and so resolution is only diffraction and dose limited (dependent on wavelength, aperture size and exposure) ...
Schaefer–Bergmann Diffraction
... Schaefer–Bergmann diffraction is the resulting diffraction pattern of light interacting with sound waves in transparent crystals or glasses ...
Diffraction - Coherence
... The description of diffraction relies on the interference of waves emanating from the same source taking different paths to the same point on a screen ... two slits, the resulting pattern on a screen would look like two single slit diffraction patterns ...
Liquids - Microscopic Properties - Static Structure Factor
... evidenced by the absence of Bragg peaks in X-ray and neutron diffraction ... Under normal conditions, the diffraction pattern has circular symmetry, expressing the isotropy of the liquid ... In radial direction, the diffraction intensity smoothly oscillates ...
Liquid - Microscopic Properties - Static Structure Factor
... absence of Bragg peaks in X-ray and neutron diffraction ... Under normal conditions, the diffraction pattern has circular symmetry, expressing the isotropy of the liquid ... In radial direction, the diffraction intensity smoothly oscillates ...