Theoretical efficiency limit of diffractive input couplers in augmented reality waveguides.

Considerable efforts have been devoted to augmented reality (AR) displays to enable the immersive user experience in the wearable glasses form factor. Transparent waveguide combiners offer a compact solution to guide light from the microdisplay to the front of eyes while maintaining the see-through optical path to view the real world simultaneously. To deliver a realistic virtual image with low power consumption, the waveguide combiners need to have high efficiency and good image quality.

The complete mitochondrial genome of (Coleoptera, Eumolpidae, Eumolpinae) and its phylogenetic status.

(Baly, 1860) is one of the main pests of grapes, mainly damaging leaves, petioles and shoots and seriously affecting plant growth and development. Recently, this pest was found to damage the leaves of , , and However, the phylogenetic relationships of and other related family members are unclear. In this study, we sequenced and analysed the complete mitogenome of for the first time.

The complete chloroplast genome of Wall. and its phylogenetic analysis.

Wall. is a medicinal and edible homologous plant in folk medicine that displays excellent pharmacological activities. However, the phylogenetic relationship between and other related family members remains unclear.

The complete chloroplast genome of Hemsl. and its phylogenetic analysis.

Hemsl. belongs to the Caprifoliaceae family and used as a substitute for 'jin yin hua'. Recent years, it demonstrates great economic value because of its rich chemical composition.

The complete chloroplast genome of Levl. and its phylogenetic analysis.

Levl, a Chinese herbal medicine widely used in the folk, has the effect of clearing away heat and detoxifying similar to other plants of the . However, its genetic relationship with these plants is unclear. In this work, the cp genome of Levl.

Exploring the genes involved in biosynthesis of dihydroquercetin and dihydromyricetin in Ampelopsis grossedentata.

Dihydroquercetin (DHQ), an extremely low content compound (less than 3%) in plants, is an important component of dietary supplements and used as functional food for its antioxidant activity. Moreover, as downstream metabolites of DHQ, an extremely high content of dihydromyricetin (DHM) is up to 38.5% in Ampelopsis grossedentata.

Compensator design for polarization state management in waveguide displays based on polarization volume gratings.

In this work, we focus on the polarization state management in optical devices using optical elements based on circular polarization. As an example, we point out the issue in a waveguide display using circular polarization optical elements as input/output couplers, where the polarization state of the light can change as it propagates in the waveguide due to total internal reflection (TIR). This has a negative effect on the waveguide output coupler efficiency, image uniformity, and the polarization multiplexing capability.

Closer look at transmissive polarization volume holograms: geometry, physics, and experimental validation.

In this work, we took a closer look at transmissive polarization volume holograms (T-PVH) to provide clarifications on their geometry, physics, and optical responses by finite-difference time-domain (FDTD) simulation and experimental validation. First, we introduced the four possible geometries of T-PVH and simulated their optical responses in terms of diffraction efficiency, polarization selectivity, and polarization output. It is shown that the configuration we called "Slanted T-PVH (-/-+90)," where the director is perpendicular to the Bragg planes, has the advantageous property of maintaining circular output polarization states.

Polarization-independent fast optical shutter with high transmission.

In this work, we designed a fast cholesteric shutter by switching the director between homeotropic and transient planar states. It is polarization independent, has sub-millisecond response time, high transmission in homeotropic state, and is highly reflective in the transient planar state. We also developed a driving waveform to achieve a long dark state of the device.

Reduced graphene oxide hydrogel film with a continuous ion transport network for supercapacitors.

Stacking of Graphene usually results in a close packing of graphene nanosheeets corresponding to a low specific surface area and pore volume. A new simple method to prepare reduce graphene oxide (rGO) film has been developed using an in situ electrochemical reduction of the as-formed GO hydrogel film in an aqueous solution electrolyte. The as-obtained rGO hydrogel film has a highly specific surface area and was directly used as the electrodes for a supercapacitor, in which the ion channels remained with excellent capacitance, even at a high current density.