It seems that everything is being miniaturized these days, and solar power is no exception. In the Input Output column in the March 2008 Mechanical Engineering magazine, Jeffrey Winters reports on work being performed at the Idaho National Laboratories to develop nanoscale antennae that are small enough to absorb energy from the tiny wavelengths of sunlight.
Solar Antenna Design
Unlike traditional methods to harvest energy from sunlight, such as photovoltaic cells or solar thermal systems, solar antennae react to the electric field caused by light waves, just as a car antenna reacts to the megahertz waves of FM radio. However, antennae must be sized based on the wavelengths of the particular waves being targeted. Until recently, it was simply not possible to create an antenna small enough to capture the small waves of sunlight.
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