Active metasurface in the near-infrared region by gating ultrathin TiN films
Active metasurface in the near-infrared region by gating ultrathin TiN films
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DOI：
10.1364/ol.472187
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Weiren Zhao
中科院分区：
文献类型：
--
作者：
Huan Jiang;Wenchang Zhu;Junhao Huang;Hui Zhang;Weiren Zhao
Ultrathin titanium nitride (TiN) films have become a novel material flatform for constructing active metasurfaces in the near-infrared region. In this Letter, we numerically achieved the dual functions of switchable linear dichroism (LD) and tunable perfect absorption in a G-shape gold resonators/TiN film hybrid metasurface by gating ultrathin TiN films. As the carrier density of TiN decreases, the modulation depth for LD strength is about 70% at 1211 nm. Meanwhile, the response wavelength of perfect absorption (∼1) shifts to the blue by around 130 nm with a change of carrier density of 12%. Our proposed active metasurface with the capability of strength-switchable LD and wavelength-tunable perfect absorption has considerable potential in dynamic electro-optic modulation and flat photonic devices with reconfigurable functionalities.
