Electrically tunable photonic band gap structure in monodomain blue-phase liquid crystals

摘要: Photonic band gap materials have the ability to modulate light. When they can be dynamically controlled beyond static modulation, their versatility improves and become very useful in scientific industrial applications. The quality of photonic depends on tunable wavelength range, dynamic controllability, selectivity response external cues. In this paper, we demonstrate an electrically material that covers a wide range (241 nm) visible spectrum is based monodomain blue-phase liquid crystal stabilized by nonmesogenic chiral mesogenic monomers. With approach, accurately tune reflection possesses narrow bandwidth (27 nm) even under high electric field. switching fully reversible owing relatively small hysteresis with fast time, it also shows wider viewing angle than cholesteric crystals. We believe proposed has potential color filters bandpass filters. A reflects light specific controllable been created researchers South Korea USA. structure made up repeating pattern significantly influence way wave, such as sound or light, passes through when similar pattern’s periodicity. This principle basis materials, which block transmission color. team led Min Su Kim from Johns Hopkins University, Baltimore, Seung Hee Lee Jeonbuk National Jeonju, produced liquid-crystal-based spectrally pure An applied electrical field could across wavelengths. used for optical blue phases ~241 nm. novel monomer enables us stabilize induce electrostriction upon biased fields. device exhibits gamut 85% NTSC purity 31 nm.