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Experimental Methods and Techiques
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Written by xScience.Info
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Wednesday, 06 September 2006 |
Laser optical antennas represent a relatively new approach to
getting around the old diffraction limit characterizing conventional
optics, namely the inability of a lens to focus light for imaging
purposes to any better than about half the wavelength of the light
being used.
Like a rooftop antenna which grabs meter-sized radio
waves and turns them (courtesy of a tuned circuit) into signals far
smaller in physical extent, so the optical antenna converts visible
light into an illuminating beam of much higher resolving power. For
example, 800-nanometer light can produce images with a spatial resolution
of no better than about 400 nanometer.
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