Novel full complex-amplitude modulation diffractive optical element

Luiz Goncalves Neto; Patricia S.P. Cardona; Giuseppe Antonio Cirino; Ronaldo Domingues Mansano; Patrick Verdonck

doi:10.1117/12.448160

13 November 2001 Novel full complex-amplitude modulation diffractive optical element

Luiz Goncalves Neto, Patricia S.P. Cardona, Giuseppe Antonio Cirino, Ronaldo Domingues Mansano, Patrick Verdonck

Proceedings Volume 4437, Gradient Index, Miniature, and Diffractive Optical Systems II; (2001) https://doi.org/10.1117/12.448160
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

In order to address an increasing numbers of industrial applications for Diffractive Optical Elements, the development of more efficient ways of designing and fabricating these devices is clearly needed. Among the main applications of these devices are beam shaping, optical interconnects and filtering. In order to reduce the design complexity and increase the performance and robustness, a novel, full complex-amplitude modulation Diffractive Optical Element was designed. This proposed element has the flexibility of allowing full control over both phase and amplitude modulation of whatever optical wave-front. The concept of this element is to bring together the positive characteristics of the high efficient phase modulation Diffractive Optical Element and the characteristics of an amplitude modulation Diffractive Optical Element, to achieve design freedom and fabrication facility, capable of obtaining a high-quality reconstructed image. The phase grating was fabricated in an amorphous hydrogenated carbon thin film, and thereafter an aluminum layer was deposited and patterned to obtain apertures in this reflective film. The use of a reflective layer in the fabrication avoids the risk of laser-induced damage since no absorption is involved in the process. Several devices, such as high-quality holographic displays, can be manufactured with this technique.

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Luiz Goncalves Neto, Patricia S.P. Cardona, Giuseppe Antonio Cirino, Ronaldo Domingues Mansano, and Patrick Verdonck "Novel full complex-amplitude modulation diffractive optical element", Proc. SPIE 4437, Gradient Index, Miniature, and Diffractive Optical Systems II, (13 November 2001); https://doi.org/10.1117/12.448160

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KEYWORDS

Diffractive optical elements

Modulation

Holograms

Carbon

Phase shift keying

Etching

Optical design

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