Optical: systems and elements – Diffraction – From zone plate
Reexamination Certificate
2006-08-29
2006-08-29
Chang, Audrey (Department: 2872)
Optical: systems and elements
Diffraction
From zone plate
C359S572000, C359S230000, C359S213100
Reexamination Certificate
active
07099084
ABSTRACT:
A zone plate modulator modulates an incident wave by changing the relative distance between a pair of complementary reflective zone plates. The modulator acts to reflect the incident wave as a plane mirror in a first configuration, and to diffract the incident wave into a series of focal points along the axis of the modulator as a phase zone plate in a second configuration. A force applied to the zone plates changes the zone plate modulator between the first and second configurations, therefore modulating the incident wave. The force can be an electrostatic force generated by a voltage source. An array of zone plate modulator elements is a compact spot array generator performing both the modulating and focusing functions. An achromatic zone plate modulator provides a both wavelength and polarization independent modulation of the incident wave. A variable optical attenuator comprises achromatic zone plate modulators.
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