Bitwise Meta-Holography – Dynamic, Interactive

December 22nd, 2023 | Technology

Computer-generated holography (CGH) is a technology that uses computer algorithms to dynamically reconstruct virtual objects, with applications in various fields such as three-dimensional display, optical information storage and processing, entertainment, and encryption. However, current techniques often rely on projection devices like spatial light modulators (SLMs) and digital micromirror devices (DMDs), which have limited display capabilities. Metasurfaces, composed of subwavelength nanostructures, have demonstrated exceptional capabilities in modulating electromagnetic waves, enabling modulation effects that are challenging to achieve with traditional devices.

Despite these advancements, dynamic metasurface holography still faces challenges in realizing real-time, highly fluid dynamic display effects required for advanced displays, such as human-computer interaction. High computational and display frame rates are crucial for delivering a fluid visual experience. A team of researchers has introduced a dynamic interactive bitwise meta-holography (Bit-MH) technique with high computational and display frame rates, constructing the world’s first practical interactive metasurface holographic display system.

The researchers conducted benchmark tests on a low-power Raspberry Pi computing platform, revealing that the maximum computational frame rate of the bitwise meta-holography (Bit-MH) approach can reach up to 800 kHz and a maximum display frame rate of 23 kHz. The proposed design for bitwise dynamic holography allows for efficient updating of holographic images and real-time interaction with external input devices, paving the way for future smooth and efficient metasurface holographic display systems. The approach serves as a model for advanced dynamic meta-holography, which has the potential to be used in a wide range of applications, such as sophisticated human-computer interaction, real-time 3D visualization, and next-generation virtual and augmented reality systems.

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