Although previously reported terahertz absorbers can achieve high-sensitivity refractive index sensing,the resonant peak is too broad,which leads to a low figure of merit[FOM].Transmissive sensors based on bound state...Although previously reported terahertz absorbers can achieve high-sensitivity refractive index sensing,the resonant peak is too broad,which leads to a low figure of merit[FOM].Transmissive sensors based on bound states in the continuum[BIC]can achieve high FOM,but they have some limitations in high sensitivity.Herein,we propose a periodic triple parallel metal bars structure to obtain high quality,a strong field,and multiple hot spots by the Friedrich-Wintgen BIC.Numerical results show the sensitivity and FOM can reach 1877 GHz/RIU and 665,respectively.Compared to the previously reported transmissive sensors based on BIC,the sensitivity has been greatly improved.展开更多
基金supported by the National Natural Science Foundation of China(Nos.U22A20258,62175178,61971300,and 61905208)the Central Guidance on Local Science and Technology Development Fund of Shanxi Province(No.YDZJSX2021A013)+2 种基金the National Key Research and Development Program of China(No.2021YFA1400601)the Program for the Top Young Talents of Shanxi Provincethe Program for the Sanjin Outstanding Talents of China。
文摘Although previously reported terahertz absorbers can achieve high-sensitivity refractive index sensing,the resonant peak is too broad,which leads to a low figure of merit[FOM].Transmissive sensors based on bound states in the continuum[BIC]can achieve high FOM,but they have some limitations in high sensitivity.Herein,we propose a periodic triple parallel metal bars structure to obtain high quality,a strong field,and multiple hot spots by the Friedrich-Wintgen BIC.Numerical results show the sensitivity and FOM can reach 1877 GHz/RIU and 665,respectively.Compared to the previously reported transmissive sensors based on BIC,the sensitivity has been greatly improved.