Abstract
Optical metasurfaces, composed of subwavelength scattering elements, demonstrate remarkable control over the transmitted amplitude, phase, and polarization of light. However, manipulating the amplitude upon transmission, without the use of surface waves, requires loss if a single metasurface is used. Herein, high‐efficiency independent manipulation of the amplitude and phase of a beam is described using two lossless phase‐only metasurfaces separated by a distance. With this configuration, optical components such as combined beam‐forming and splitting devices are experimentally demonstrated, as well as those for forming complex‐valued, 3D holograms. The compound meta‐optic platform provides a promising approach for achieving high‐performance holographic displays and compact optical components, while exhibiting a high overall efficiency.
Highlights
Controlling the amplitude, phase, and polarization of an optical field is essential to many applications in a broad range of scientific and industrial areas
We developed hologram alignment marks formed by silicon arrays fabricated near each of the two metasurfaces
The measured intensity images from each of the meta-optic devices demonstrate the accuracy of complex-valued optical field control with high efficiency
Summary
Controlling the amplitude, phase, and polarization of an optical field is essential to many applications in a broad range of scientific and industrial areas This is achieved using a sequence of optical components such as lenses, polarizers, gratings, and amplitude masks. The ability to locally control the transmission characteristics provides a powerful approach to realizing flat optical components and systems with improved performance[1,2,3,4] This has been shown through a variety of devices, including flat lenses[5,6], beam-splitters[7,8,9,10,11,12], holograms[13,14,15,16,17], augmented reality displays[18], highdefinition displays[19], image differentiation[20], and compact optical spectrometers[21]. Optical applications requiring spatial manipulation of the amplitude profile have relied on reflection[22], absorption[23], or polarization conversion loss[11,12,14,15,16,17], resulting in low efficiencies
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