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- W2007298851 abstract "DIFFRACTION of light by an aperture is a well-known manifestation of the wave nature of light. The most familiar case is that of an incident plane wave, which is diffracted into a spatial pattern that is sensitive to the properties of the aperture: the ratio of transmitted power to incident flux (the transmission cross-section σ) depends in a complicated way on the aperture area A (refs 1–3). For diffuse (that is, isotropic rather than plane-wave) illumination, however, the situation is much simpler4: in three dimensions, σ increases with A in a series of steps of equal height λ2/2π (where λ is the wavelength of the light), and is thus independent of the detailed aperture shape. A similar simplification occurs for two-dimensional diffuse illumination of a slit: the transmission cross-section per unit slit length increases in stepwise fashion as a function of the slit width W, with steps of height λ/2 occurring whenever W = nλ/2 (n = 1,2,3,…)—that is, whenever a new mode is enabled in the slit. Although the optical transmission characteristics of slits have been studied extensively for plane-wave illumination5–8, we know of no investigation of this predicted staircase dependence for diffuse illumination. Here we report the observation of such an effect, and suggest that it may play a part in any process of wave propagation through a constriction." @default.
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- W2007298851 date "1991-04-01" @default.
- W2007298851 modified "2023-10-16" @default.
- W2007298851 title "Observation of the optical analogue of quantized conductance of a point contact" @default.
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- W2007298851 doi "https://doi.org/10.1038/350594a0" @default.
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