Abstract
Owing to the characteristics of existing spatial light modulators (SLMs), the computer-generated hologram (CGH) with continuous complex-amplitude is conventionally converted to a quantized amplitude-only or phase-only CGH in practical applications. The quantization of CGH significantly affects the holographic reconstruction quality. In this work, we evaluated the influence of the quantization for both amplitude and phase on the quality of holographic reconstructions by traversing method. Furthermore, we considered several critical CGH parameters, including resolution, zero-padding size, reconstruction distance, wavelength, random phase, pixel pitch, bit depth, phase modulation deviation, and filling factor. Based on evaluations, the optimal quantization for both available and future SLM devices is suggested.
Highlights
Holography is a type of technology that enables building mathematical connections between target objects and interference patterns
The reconstruction quality of the continuous complex-amplitude computer-generated hologram (CGH) was not determined by the contained spatial frequencies
The quantization of either the amplitude or the phase in continuous complex-amplitude CGH led to a decline in the reconstruction quality
Summary
Holography is a type of technology that enables building mathematical connections between target objects and interference patterns. A captured interference pattern is often employed to reconstruct the corresponding target object [1,2]. In computer-generated holography, a target object is often employed to calculate the corresponding interference pattern, which is known as a computer-generated hologram (CGH). A metasurface is a device that can present the complex-amplitude CGH and improve the image quality of the holographic reconstructions [25,26]. The obtained CGH is set to a specific resolution, while the pixel value of the CGH is approximated to the nearest available modulation state This restrictive behavior significantly affects the quality of the holographic reconstruction. This work is especially useful when one considers an advanced holographic display that is based on SLMs with a limited performance in terms of amplitude and phase modulation
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