Tunable transparent terahertz absorber for sensing and radiation warming
Tunable transparent terahertz absorber for sensing and radiation warming
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DOI：
10.1016/j.carbon.2023.118376
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发表时间：
2023-08
期刊：
影响因子：
10.9
通讯作者：
Wendao Xu;Lijuan Xie;Y. Ying
中科院分区：
文献类型：
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作者：
Wendao Xu;Lijuan Xie;Y. Ying
由于太赫兹（THz）波段功能器件的缺乏，阻碍了THz波段的大量实际应用。在这项工作中，我们开发了透明的太赫兹吸收器，采用三层索尔兹伯里屏幕结构。单层石墨烯和氧化铟锡（ITO）玻璃由薄介电膜隔开，形成透明的THz吸收体。在离子凝胶的辅助下，石墨烯层的载流子密度可以通过微小的外部电门控（−2.5 V-2.5 V）进行有效的调谐，调制深度达到100%。利用石墨烯与含有π电子的外部分子之间的强π−π相互作用，我们制造的透明THz吸收体能够检测二苯胺（DPA）。吸附的DPA分子使石墨烯的费米能级向狄拉克点移动，检测限为5.5 ng。此外，通过将吸收的辐射转化为热量，我们制造的吸收器可以用作辐射加热装置。在红外辐射环境中，透明THz吸收体的表面温度比玻璃高0.7 °C。请注意，吸收剂在可见光波段高度透明，不会妨碍植物的光合作用过程。因此，THz吸收剂在波操纵、分子传感和辐射加热等领域具有潜在的实际应用。
The lack in efficient functional devices has hindered plenty practical applications in terahertz (THz) band. In this work, we developed transparent THz absorber by employing trilayer Salisbury screen structure. Monolayer graphene and indium tin oxide (ITO) glass were spaced by a thin dielectric film, forming a transparent THz absorber. Assisted by ion gel, the carrier density of graphene layer can be effectively tuned through small external electrical gating (−2.5 V-2.5 V), with a modulation depth reaching to 100%. Taking advantage of the strong π−π interaction between graphene and external molecules containing π electrons, our fabricated transparent THz absorber enabled diphenylamine (DPA) detection. The adsorbed DPA molecule moves Fermi level of graphene toward Dirac point, performing a limit of detection of 5.5 ng. Moreover, by transferring the absorbed radiation into heat, our fabricated absorber can serve as a radiation warming device. The surface temperature of transparent THz absorber is 0.7 °C higher than that of glass in IR radiation environment. Note that the absorber is highly transparent in visible band, it will not prevent photosynthesis process of plants. Thereby, the THz absorbers have potential practical applications in diverse fields including wave manipulation, molecule sensing, and radiation warming.