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Reconfigurable all-dielectric Fano metasurfaces for strong full-space intensity modulation of visible light.
Nanoscale Horizons ( IF 9.7 ) Pub Date : 2020-04-27 , DOI: 10.1039/d0nh00139b
Sun-Je Kim 1 , Inki Kim , Sungwook Choi , Hyojin Yoon , Changhyun Kim , Yohan Lee , Chulsoo Choi , Junwoo Son , Yong Wook Lee , Junsuk Rho , Byoungho Lee
Affiliation  

Dynamically reconfigurable nanoscale tuning of visible light properties is one of the ultimate goals both in the academic field of nanophotonics and the optics industry demanding compact and high-resolution display devices. Among various efforts incorporating actively reconfigurable optical materials into metamaterial structures, phase-change materials have been in the spotlight owing to their optical tunability in wide spectral regions including the visible spectrum. However, reconfigurable modulation of visible light intensity has been limited with small modulation depth, reflective schemes, and a lack of profound theoretical background for universal design rules. Here, all-dielectric phase-change Fano metasurface gratings are demonstrated for strong dynamic full-space (reflection and transmission) modulation of visible intensities based on Fano resonances. By judicious periodic couplings between densely arranged meta-atoms containing VO2, phase-change induced thermo-optic modulation of full-space intensities is highly enhanced in the visible spectrum. By providing intuitive design rules, we envision that the proposed study would contribute to nanophotonics-enabled optoelectronics technologies for imaging and sensing.

中文翻译:

可重配置的全介电Fano超表面,用于对可见光进行强的全空间强度调制。

在纳米光子学的学术领域和要求紧凑和高分辨率显示设备的光学行业中,可见光特性的动态可重新配置纳米级调整都是最终目标之一。在将可主动重构的光学材料整合到超材料结构中的各种努力中,由于相变材料在包括可见光谱在内的宽光谱区域中具有光学可调性,因此成为人们关注的焦点。但是,可见光强度的可重构调制受到调制深度小的限制,反射方案的限制,并且缺乏通用设计规则的深刻理论背景。这里,演示了全介电相变Fano超表面光栅可基于Fano共振对可见光强度进行强动态全空间(反射和透射)调制。通过明智地周期性排列含VO的密集原子之间的耦合如图2所示,在可见光谱中高度增强了相变引起的全空间强度的热光调制。通过提供直观的设计规则,我们可以预想所提出的研究将有助于纳米光子技术的成像和传感光电技术的发展。
更新日期:2020-06-29
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