Abstract
Low-power integrated projection technology can play a key role in development of low-cost mobile devices with built-in high-resolution projectors. Low-cost 3D imaging and holography systems are also among applications of such a technology. In this paper, an integrated projection system based on a two-dimensional optical phased array with fast beam steering capability is reported. Forward biased p-i-n phase modulators with 200MHz bandwidth are used per each array element for rapid phase control. An optimization algorithm is implemented to compensate for the phase dependent attenuation of the p-i-n modulators. Using rapid vector scanning technique, images were formed and recorded within a single snapshot of the IR camera.
Highlights
Small form-factor optical projectors continue to be an integral part of consumer electronics
The liquid crystal on silicon (LCOS) technology is a hybrid of liquid crystal display (LCD) and digital light processing (DLP) technologies since it uses mirrors to reflect the light and uses LCD panels to block light
We report an efficient integrated projection system based on a fast steering optical phased array
Summary
Small form-factor optical projectors continue to be an integral part of consumer electronics. Even with LED based light sources, a DLP projector requires a lens, often a prism, and is inefficient due to waste of optical power by micro-mirrors in ’off’ state. Optical phased array technology can be used to implement projection systems. We report an efficient integrated projection system based on a fast steering optical phased array. The proposed architecture can project an image by vector or raster scan of the beam spot on the screen without use of a lens or any other optical components. This allows the entire projection system to be integrated on a single photonic chip with no mechanical movements at all. Due to low power consumption, compact size, and low cost of mass production, this integrated projection solution lends itself more towards being utilized in mobile devices
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