I found this picture of a roulette wheel. Tiny slots are organized across the perimeter of every wheel. Light from the LED, shining by the slots in the wheel on the cell, creates a small amount of current.
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They have a radiation pattern similar to a corresponding linear array of dipole antennas, with the exception that the slot can solely radiate into the house on one facet of the waveguide floor, 180° of the encircling area.
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