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Scanning electron microscopy micrographs of the etched and gold-coated pyramids. (a) Top view showing pyramids in a rectangular array with a pitch of . (b) Cross-sectional view of a single pyramid. This was obtained by cleaving the pyramid parallel to one of its edges. The base of the pyramid has a side of length , corresponding to a perpendicular depth of .
(Color online) Measured intensity distribution of reflected light, at a distance of from the array of pyramids, when it is illuminated at normal incidence. A central bright spot, which is caused by reflection from the region between pyramids, was blocked to improve the visibility of light reflected from the pyramids. The circles in (a) show the reflection pattern expected for a perfect pyramid, while the circles in (b) indicate the calculated reflection pattern for a pyramid with rounded corners. Size indicates expected relative intensity.
(Color online) (a) Cross section in the plane through a pyramid, showing type (1) and (2) trajectories. These involve reflections from mirrors on opposite sides of the pyramid. (b) View of the entrance aperture of the pyramid, showing the regions that produce type (1), (2), and (3) rays.
Views of the vertex pyramidal mirror under an optical microscope at magnification. Top row: Raytracing simulation. Bottom row: Photographs. (a) and (d) without polarizers; (b) and (e) parallel polarizer and analyzer; (c) and (f) crossed polarizer and analyzer.
(Color online). Fluorescence image of atoms magneto-optically trapped in a 70.5° pyramid. Two reflections are also visible. The aperture of the pyramid (solid line) and its sloping edges (dashed lines) have been added to guide the eye of the reader. The outline of the incident laser beam is shown dotted. Some light is scattered from the edges of the pyramid and from the plane outside.
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