Volume 14 Issue 4
Jul.  2021
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CAO Tun, LIU Kuan, LI Yang, LIAN Meng, HU Zi-xian, LIU Xuan, LI Gui-xin. Tunable optical metamaterials and their applications[J]. Chinese Optics, 2021, 14(4): 968-985. doi: 10.37188/CO.2021-0080
Citation: CAO Tun, LIU Kuan, LI Yang, LIAN Meng, HU Zi-xian, LIU Xuan, LI Gui-xin. Tunable optical metamaterials and their applications[J]. Chinese Optics, 2021, 14(4): 968-985. doi: 10.37188/CO.2021-0080

Tunable optical metamaterials and their applications

doi: 10.37188/CO.2021-0080
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  • Optical metamaterials are composed of array of artificial sub-wavelength resonators, exhibiting novel optical phenomena that not occur in natural materials. By using optical metamaterials, one can flexibly control the light propagation and realize fantastic optical phenomena such as negative refraction, cloaking and unidirectional transmission, etc. Traditional optical metamaterials usually have fixed geometric structures and unchanged material properties, which limits their capabilities of tuning optical responses. Recently, tunable optical metamaterials based on exceptional materials or structures have attracted much attention. In this review, we investigate the fundamentals of tunable optical metamaterials realized by either integrating the active materials (i.e., varactor diodes, liquid crystals, phase change materials, graphene, etc.) or reconstructing the resonators array (i.e., micro electromechanical systems, stretchable materials, etc.). We systematically summarize the progress in this area, analyze the features of tunable optical metamaterials under different control mechanisms, elaborate the challenges of tunable optical metamaterials facing in future applications, and predict the future development direction.

     

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