Abstract
A deep learning model was built to optimize the phase flicker performance for given pulse width modulation (PWM) driving patterns of a liquid crystal on silicon (LCOS) device. 10-bit phase modulation was physically realized with a phase flicker of 0.055% over 1024 addressed phase levels in respect to the total modulation range of 2 π and a separation probability of 62.63% for the phase to stay within its level without overlapping with the adjacent ones. The spatial information bandwidth of the full high-definition (HD) LCOS device at 100 Hz was improved by 25%, from ~1.6 Gb/sec to ~2 Gb/sec.
Highlights
IntroductionThere are two main types of SLMs, the MEMSbased digital micromirror devices (DMDs) and the liquid crystal-based ones such as phase-only liquid crystal on silicon (LCOS) devices
Spatial light modulators (SLMs) are widely used in many integrated photonics and electronic systems for a wide range of applications, from conventional and holographic displays [1,2,3] to telecommunication wavelength-selective switches (WSS) [4, 5] and biomedical optical tweezers [6, 7].Currently, there are two main types of SLMs, the MEMSbased digital micromirror devices (DMDs) and the liquid crystal-based ones such as phase-only liquid crystal on silicon (LCOS) devices
For the same LCOS device, the viscosity property can be controlled by the factors like device temperature and LC layer thickness
Summary
There are two main types of SLMs, the MEMSbased digital micromirror devices (DMDs) and the liquid crystal-based ones such as phase-only liquid crystal on silicon (LCOS) devices. The former is fast switching in the order of 101 μs but can only modulate the amplitude of light in a binary fashion; it has poor optical efficiency. A full highdefinition (HD) LCOS device has a bandwidth of ~1.6 Gb/sec ( ~ 2 × 103 pixels × 103 pixels × 100 Hz × 8 bits), while a DMD with the same resolution can provide a bandwidth of ~50 Gb/sec ( ~ 2 × 103 pixels × 103 pixels × 25 kHz × 1 bit) It would be hugely beneficial if LCOS devices with an unprecedented level of spatial information bandwidth could be realized through the fundamental research
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