Design of active and informative display with liquid crystal modulator

Abstract

Informative, clear, and active properties are important factors in the field of display. Hologram shows visible signal as 3D display and structural color has a potential with high resolution, environmental protection and high durability against chemical pigments. Metasurface which is composed of nano-structures with subwavelength scale is a method to realize a variety of information such as hologram and structural color. Each of them is called ‘metahologram’ and ‘meta-color’. Especially, its miniaturation and integration of the system are a spotlight in the field of display. Herein, we add liquid crystals (LCs) modulator for active platform to replace using responsive materials on metasurface. LCs are used broadly as stimuli-responsive materials. Especially, the reorientation of LCs by stimuli enables to control actively the properties of the light passed by the LCs. In this work, we demonstrated that the tunable meta-system combined with metasurface and LC modulator. The system is consisted of polarization dependence metasurface and LCs modulating polarization of the light. Consequently, we realized the active system to change the hologram and gray scale of color by specific stimuli (e.g. electrical field, heat, pressure, gas). Additionally, for more informative system, we add the orbital angular momentum to represent more hologram in one system. That is, our platform enables to design the infinite informative display. Design of meta-system with LCs will be useful for future integrated display. This work was supported by NRF (2021R1A4A1030944, 2021R1A2C2095010) and Samsung Electronics Co., Ltd (4.0024479).