Jiaxing Wang

Reflective liquid crystal displays (RLCDs), which use ambient light as their light source, have been extensively explored as people pay more attention to eye care displays. In this work, a novel variety of normal white mode RLCD with improved high contrast ratio (CR) performance is studied. The reflection function is achieved by cleverly designing the angle of the advanced polarizer film (APF). The CR of the RLCD is enhanced by over 90% when compared to the conventional metal RLCD, significantly enhancing its performance. The study demonstrates that by adjusting the angle of polarizer PVA, Chroma can be optimized and adjusted. The new RLCD's customizable Chroma on bright state makes it suited for a variety of application scenarios. The results show that the new RLCD has a high CR, a flexible Chroma design, and a wide range of application scenarios.

The optical performance of normally white reflective LCDs with various liquid crystal cell parameters and light scattering structures was investigated. The reflectivity and reflective CR both increased first and then decreased as the twist angle increased, whereas the color coordinate of white showed obvious cell gap dependency. Meanwhile, research revealed that while the light‐diffusing film had obvious advantages in terms of reflective optical performance, it could cause significant losses in transmissivity and transmissive CR, necessitating different design considerations for Full‐Reflective LCD and Trans‐Reflective LCD. Finally, the optimum design parameters were applied to our RLCD, which improved the reflectivity and CR while also achieving a better display effect of white pattern.

As a very promising method for improving the performance of organic photovoltaic (OPV) devices, femtosecond laser processing is advantaged at high processing precision, small heat-affected zone and can achieve selective morphology control of the active layer. However, almost current studies focused on single pulse processing. In this work, the single and double pulse processing laws of poly(3-hexyl-thiophene) (P3HT): phenyl-C61-butyricacid methyl ester (PCBM) blend films were explored by using temporally-shaped femtosecond laser processing system. When single pulse processing is used, it indicated a structural transformation process from bump to ablation crater. The temporally-shaped double pulse femtosecond laser processing results showed the effect of ablation enhancement compared with the single pulse, and the ablation depth and the ablation area increased. (For bumps, it facilitated further fragmentation). When the double pulse delay is 0.5ps, the effect of ablation enhancement (bump fragmentation) was the strongest. This letter proposed an ablation enhancement approach based on temporally-shaped femtosecond laser processing, which can further control the morphology of the active layer for promoted performance of OPV devices.

We report a broadband tungsten absorber based on a nanocone metallic resonant structure fabricated by self-assembly nanosphere lithography. In experimental demonstration, the fabricated absorber has more than 90% average absorption efficiency and shows superior angular tolerance in the entire visible and near-infrared spectral region. We envision that this large-scale nanostructured broadband optical absorber would find great potential in the applications of high performance optoelectronic platforms and solar-thermal energy harvesting systems.

We propose an ultra-thin plasmonic color filtering device based on subwavelength metal grating engraved on a dielectric membrane waveguide without substrate. As experiments demonstrate, the fabricated free-standing plasmonic color filters have more than 70% transmission efficiency at different resonant wavelengths in the visible spectral region and are capable of generating arbitrary colors. Experimental results are in good agreement with the theoretical calculations. These artificial nanostructured color filtering devices may find potential applications in high resolution color imaging and sensing systems.