The light modulator includes elongated elements and a support structure coupled to the elongated elements. Each element includes one or more lengthwise slits within an active optical area, and a light reflective planar surface with the light reflective planar surfaces lying in a grating plane. The support...http://www.google.com.au/patents/US7057819?utm_source=gb-gplus-sharePatent US7057819 - High contrast tilting ribbon blazed grating
