应用于葡萄糖溶液检测的人工电磁超表面结构设计

Artificial electromagnetic metasurface structure design for glucose solution detection

提出了一种用于葡萄糖浓度检测的电磁近场聚焦人工超表面结构。经人工超表面反射的电磁波近场聚焦位置对介电常数具有高敏感性,据此能够对不同浓度的葡萄糖溶液进行检测。该结构尺寸为400 mm×400 mm×1 mm,由20×20个具有不同电磁波反射相位差的异构人工超表面单元组成。为验证设计的可行性,对不同浓度值的葡萄糖溶液进行了实验测试,结果表明:葡萄糖浓度值的改变将导致溶液相对介电常数的改变,进而对聚焦位置产生显著的影响,溶液相对介电常数变化的检测灵敏度为0.027%。

An electromagnetic near-field focused artificial metasurface structure for glucose concentration detection is put forward.Focusing position of the electromagnetic wave near-field reflected by artificial metasurface has high sensitivity to the dielectric constant of the glucose,which can detect different concentrations of glucose solution.The size of structure is 400 mm×400 mm×1 mm,it consists of 20×20 heterogeneous artificial metasurface elements which has different electromegnetic wave reflection phase difference.In order to verify the feasibility of the design,experimental tests on glucose solutions with different concentration values are carried out.The result shows that variation of glucose concentration value will lead to variation of the relative dielectric constant of the solution,further has a significant impact on the focusing position.The detection sensitivity of variation of the relative dielectric constant of the solution is 0.027%.