Symmetric Ge₂Sb₂Te₅ based metamaterial absorber induced dynamic wide-gamut structural color

Abstract

Plasmonic color has played a critical role for its applications in color printing and display owing to the advantages of high-resolution and durability. Recently, increasing attempts have been performed to actualize dynamic structural color. Here theoretically proposed is the generation of wide color gamut in symmetric Ge2Sb2Te5 (GST) based metamaterial absorber. By introducing a periodic metallic nanodisk array on top of the composite structure, the color variation arises from GST transition between amorphous phase and crystalline phase can be enhanced significantly. Due to the interplay of the localized/propagating surface plasmons, Fabry–Perot cavity mode and Wood’s anomaly with different resonant frequencies, both hue and saturation of the structural color can be tuned accordingly through adjusting the structural geometry of the nanodisks. It is demonstrated that up to 74% and 94% of the sRGB and CMY(K) space can be obtained with this phase-change metamaterial display. This finding paves the way toward the development of practical platform for color printing and display applications.

Tunable Infrared Detection, Radiative Cooling and Infrared-Laser Compatible Camouflage Based on a Multifunctional Nanostructure with Phase-Change Material

“…Since GST is non-volatile, once the phase transition is completed, it can maintain the corresponding state at room temperature for a long time, so our research was carried out at room temperature. Meanwhile, since Si, Au and Al 2 O 3 all have high melting and boiling points, the annealing process of GST does not affect the final research results [62]. If we do not change the temperature directly, the phase change can also be stimulated by other methods, such as electrical tuning [60], trains of femtosecond pulses [63] and laser pulse control [64].…”

Single pixel wide gamut dynamic color modulation based on graphene micromechanical system

“…Assuming standard illumination (CIE) D65 normally illuminate (white daylight) the proposed structure from the top, the generated colors can be characterized by the CIE XYZ color space with the tri-stimulus values given as [48][49][50][51].…”

A review of tunable photonics: Optically active materials and applications from visible to terahertz

“…Thus, the metal/ITO/GST-225/ITO structure reveals a distinct resonant color shift even in ultrathin thickness of active layer (GST-225, 7 nm). Recent approaches utilizing cavity layer ( Lee et al., 2020 ) and metamaterial ( Rui et al., 2020 ) with embedding an ultrathin GST absorber have enhanced color purity or tunability. For more feasible reversibility and fast transition in GST, recently, new approaches offer a modulation of the doping ratio and composition.…”