Controllable diffraction grating for modulation of...

Details Controllable diffraction grating for modulation of... Controllable diffraction grating for modulation of...

G - Physics

02

B

345/55, 88/0.1

G02B 5/18 (2006.01) G02B 26/00 (2006.01) G02F 1/19 (2006.01)

Patent

CA 1067192

ABSTRACT OF THE DISCLOSURE Apparatus and method for modulating quasi-mono- chromatic electromagnetic radiation utilizing a controllable diffraction grating. A reflection diffraction grating is comprised of a material deformable in the presence of an applied electric field. A first electrode, comprised of a flexible radiation-reflecting material, is applied to the first surface of the deformable material, forming a reflecting surface of the diffraction grating. A second electrode is applied to a second surface of the deformable material. The electrodes are arranged to provide a periodic surface dis- tortion on the reflecting electrode upon application of a voltage between the first and the second electrodes, thereby resulting in a blazed diffraction grating. In addition, the blaze angle of the diffraction grating can be varied as a function of applied voltage, and consequently diffracted radiation pattern can be modulated as a function of the applied voltage. The controllable diffraction grating can modulate the diffracted radiation in a digital ?? in an analog mode of operation.

250963

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