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Optical retro-reflective apparatus with modulation capability

  • US 8,228,582 B1
  • Filed: 04/09/2010
  • Issued: 07/24/2012
  • Est. Priority Date: 10/21/2002
  • Status: Expired due to Fees
First Claim
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1. A method of retro-reflecting and modulating an optical beam comprising:

  • a. providing a retro-reflecting structure having at least one moveable optical element for selectively reflecting the optical beam impinging the retro-reflecting structure, the moveable optical element having the moveable optical element having a first position in which the retro-reflecting structure retro-reflects the optical beam and having a second position in which the retro-reflecting structure does not retro-reflect the optical beam, the first and second positions being spaced by a distance less than a wavelength of the optical beam; and

    b. moving said at least one moveable optical element in response to a modulation signal to thereby modulate the optical beam as a modulated retro-reflected beam.

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