| 摘要 |
A method of providing a diffractive (holographic) image display comprises: displaying a diffraction pattern on pixels of a spatial light modulator (SLM), the SLM comprising a plurality of optical phase modulating pixels; and illuminating said SLM with a beam of light to reconstruct a far field image formed by said diffraction pattern, wherein the SLM pixels are hexagonal or diamond shaped. The pixels can have a shape parameter S of greater than 0.333, where S is dependent on a pixel pitch Î x in a horizontal direction in a lateral plane of said SLM, a pixel pitch Î y in a vertical direction in a lateral plane of said SLM, a length of dead space (gap) Î DS between pixels, and a half H of a maximum dimension of a pixel in a lateral SLM plane measured in a vertical direction. The illumination beam may be at an angle to a SLM substrate normal, with a first diffraction order having a square shape. Pixels may include a phase step or ramp. Piston-type microelectromechanical system (MEMS) optical phase modulation pixels may be used.
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