The blue phase, which emerges between cholesteric and isotropic phases within a three-dimensional periodical superstructure, is of great significance in display and photonic applications. The crystalline orientation plays an important role in the macroscopic performance of the blue phase, where the single crystal shows higher uniformity over the polydomain and monodomain, resulting in higher Bragg reflection intensity, lower hysteresis, and lower driving voltage. However, currently reported methods of forming a single-crystal blue phase based on thermal controlling or e-beam lithography are quite time-consuming or expensive for large-scale fabrication, especially in the centimeter range, thus hindering the broad practical applications of single-crystal blue-phase-based photonic devices. Herein, a strategy to fabricate a large scale single crystalline blue-phase domain using holography lithography is proposed. Defect-free single-crystal domains both in blue phase I and blue phase II with a desired orientation of over 1 cm2 are fabricated based on a nanopatterned grating with periodic homeotropic and degenerate parallel anchoring, with colors from red and green to blue. This holography lithography-assisted strategy for fabrication of a large-scale single-crystal blue phase provides a time-saving and low-cost method for a defect-free single crystalline structure, leading to broad applications in liquid crystal displays, laser devices, adaptive optics elements, and electro-optical devices.
We propose liquid-crystal-based reconfigurable chiral metasurface absorbers and numerically investigate their chiro-optical properties. The chiral metasurface absorber is based on a metal-insulator-metal structure on the substrate, which can strongly absorb a circularly polarized wave of one spin state and reflects that of the opposite spin, resulting a strong circular dichroism. A birefringent liquid crystal (LC) is exploited to serve as the insulator layer in the metal-insulator-metal structure. We could then vary the circular state of the incident light by controlling the alignment of the LC molecules, hence inversing the circular dichroism. The simulation results show that the sign of the circular dichroism can be effectively changed by externally controlling the alignment of the LC molecules in between the homogenous and homeotropic states. The absorption efficiency for the specific circularly polarized wave can be larger than 80% and the CD is nearly 70%. The simple and compact design of our proposed chiral metasurface absorber is especially favorable for integration, and such reconfigurable chiral metasurface absorber could find many potential applications in biological detection/sensing, polarimetric imaging, and optical communications.
We demonstrate all-solid-state film with high-reflectivity based on cholesteric template. The adhesive (NOA81) is both
filler and an adhesive, which can be avoids interfacial losses. The reflected right- and left-circularly polarized light has
been developed by roll-to-roll method, and the reflectance of the films is more than 78%. Here, the all-solid film was
used in distribute feedback laser with dye-doped. In addition, this films also used in include flexible reflective display,
color pixels in digital photographs, printing and colored cladding of variety of objects.
We demonstrate full-color cholesteric liquid crystal films fabricated by cholesteric liquid crystal and reactive mesogen. The reflection linewidth of these films can be dramatically narrowed with the reduced refractive index birefringence of refilled materials. A full-color reflective display is experimentally demonstrated based on these reflective films that are refilled with small birefringence liquid crystals. The electro-optic performances of displays including response time are experimental investigated. The applications of these films include flexible reflective display, color pixels in digital photographs, printing and colored cladding of variety of objects.
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