Session Index

The molecular orientation of liquid crystals can be tuned by electric field resulting corresponded optical effects. In particular, liquid crystal on Silicon(LCOS) with small pixel array is a good candidate for dynamic spatial light modulators (SLMs). Dynamic phase modulation in the visible and near-IR region of LCOS has its advantage besides the intensity modulation applications.
In this talk, we will discuss how to achieve the high performance phase modulator in terms of phase precision and phase accuracy. In addition, the cause of pixel-level crosstalk effects and its suppressing solution will be discussed. Finally, the latest and future developments of LCOS.



 

This study explores the use of autoencoder-based image processing to enhance GaN-based metalens images, addressing blurriness and color cast issues. The autoencoder model transforms blur images into low-dimensional vector, enabling the reconstruction of clear output images. Its effectiveness in handling severe color cast and demonstrates its potential in improving image quality, making it a promising solution for compact cameras with metalens technology.

 

This study combined structured illumination technique, capturing images by changing azimuth and phase of structured light patterns, with our developed Mueller matrix imaging system to obtain resolution enhanced images which reveal more detailed polarization features of the sample. The wild-field and resolution enhanced images were demonstrated to prove the enhancement effect of this approach.

 

In the paper, the information of the holographic storage system is multiplexed and recorded in the same area. By shifting the holographic plate, the readout position corresponds to a change in the wavefront of the reading beam, resulting in a phase change in the recorded information. Therefore, we design the phase of the superimposed signals to produce interference during the shift readout process, allowing for variations in signal intensity corresponding to different shift distances. Additionally, utilizing the information in reciprocal space enables higher uniformity in the readout information.

 

HoloLens, nearing true mixed reality, employs tiny displays to project virtual images. Using Volume Holographic Optical Elements (VHOEs) as waveguides, it addresses the size-weight challenge faced by Head-Mount Displays (HMDs). However, VHOEs also counter diffraction and color issues. Leveraging VHOEs' Bragg selectivity, transparency reaches almost 90%, surpassing peers. Thus, we use this in our main focus: embedding lens systems in VHOEs, examining clarity. This aids future research on enhancing image quality.

 

An azobenzene holographic material based on the {[4-(dimethylamino) phenyl] diazenyl} benzoic acid (Methyl red) for dynamic holographic recording is synthesized. The change in refractive index is induced by 532 nm DPSS laser with a total power intensity of 200mW/cm2. The first order diffraction can be detected in 0.3 seconds. Without holographic recording, the grating disappeared in 0.5 seconds. The rapid response in holographic recording /erasing makes it possible in dynamic applications.