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Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface.Originally discovered for sound waves in the whispering gallery of St Paul's Cathedral, they can exist for light and for other waves, with important applications in nondestructive testing, lasing, cooling and sensing, as well as in astronomy.
A hemispherical enclosure will also guide whispering gallery waves. The waves carry the words so that others will be able to hear them from the opposite side of the gallery. The gallery may also be in the form of an ellipse or ellipsoid, [4] with an accessible point at each focus. In this case, when a visitor stands at one focus and whispers ...
A parabolic whispering dish that is part of an installation at Jodrell Bank Observatory A pair of smaller acoustic mirrors in a park in Muiderberg. Parabolic acoustic mirrors called "whisper dishes" are used as participatory exhibits in science museums to demonstrate focusing of sound.
Another potential application for optical ring resonators are in the form of whispering gallery mode switches. "[Whispering Gallery Resonator] microdisk lasers are stable and switch reliably and hence, are suitable as switching elements in all-optical networks."
The frequency of a stationary cryogenic microwave oscillator, consisting of sapphire crystal operating in a whispering gallery mode, is compared to a hydrogen maser whose frequency was compared to caesium and rubidium atomic fountain clocks. Changes during Earth's rotation have been searched for. Data between 2001–2002 was analyzed.
Whispering gallery mode optical resonators are axially symmetric dielectric structures ranging in size from tens of micrometers to a few millimeters, and can trap light in a small volume. The modes are solutions of Maxwell's equation and represent waves that propagate close to the surface of the resonator structures, along the perimeter.
Whispering-gallery wave; Whispering gallery; White dwarf; White hole; White noise; Whitehead's theory of gravitation; Whitham equation; Whole number rule; Wick's theorem; Wick Haxton; Wick rotation; Wide-angle X-ray scattering; Wide-bandgap semiconductors; Wideband materials; Widom scaling; Wiedemann–Franz law; Wien's displacement law; Wien's ...
A dome may have a "whispering gallery" at its base that at certain places transmits distinct sound to other distant places in the gallery. [14] The half-domes over the apses of Byzantine churches helped to project the chants of the clergy. [ 46 ]