Abstract
We report on the design and fabrication of novel diffractive phase elements that reconstruct distinct intensity patterns in the far-field on illumination with two specific wavelengths. The elements contain deep surface-relief structures that represent phase-delays of greater than 2p radians. The design process incorporates a modified version of the iterative Fourier transform algorithm. A 16 phase-level element for dual wavelength (blue and red) operation, with high diffraction efficiency, is demonstrated experimentally. © 1997 Optical Society of America.
| Original language | English |
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| Pages (from-to) | 54-59 |
| Number of pages | 6 |
| Journal | Optics Express |
| Volume | 1 |
| Issue number | 2 |
| Publication status | Published - Jul 1997 |