Abstract

We demonstrate visible and near-IR image projection via non-absorbing, multi-level broadband diffractive-optical elements (BDOEs) in one or more planes. By appropriate design of the BDOE topography, we experimentally demonstrate (1) different images in different spectral bands, (2) different images in different image planes, (3) image magnification by changing the distance between the illumination source and the BDOE, (4) completely flat BDOE via an index-contrast top coating, and (5) reflective BDOEs. All of these are accomplished with broadband illumination. Furthermore, the BDOEs are highly efficient and versatile and can be inexpensively mass manufactured using imprint-based replication techniques.

© 2019 Optical Society of America

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Supplementary Material (7)

NameDescription
» Visualization 1       Video of device in Fig. 1 under sunlight.
» Visualization 2       Video of device in Fig. 3.
» Visualization 3       Video of device in Fig. 4.
» Visualization 4       Video of device in Fig. 5.
» Visualization 5       Video showing the projected image changing as the screen is moved away from the BDOE described in Fig. 3, taken in better ambient conditions.
» Visualization 6       Video showing the projected image changing as the screen is moved away from the BDOE described in Fig. 4, taken in better ambient conditions.
» Visualization 7       Video showing the projected image changing as the screen is moved away from the BDOE described in Fig. 5, taken in better ambient conditions.

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Figures (8)

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