School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Biosensors (Basel). 2021 Oct 14;11(10):390. doi: 10.3390/bios11100390.
In this work, we present a theoretical model of a near-infrared sensitive refractive index biosensor based on the truncate 1D photonic crystal (1D PC) structure with Dirac semimetal. This highly sensitive near-infrared biosensor originates from the sharp reflectance peak caused by the excitation of Bloch surface wave (BSW) at the interface between the Dirac semimetal and 1D PC. The sensitivity of the biosensor model is sensitive to the Fermi energy of Dirac semimetal, the thickness of the truncate layer and the refractive index of the sensing medium. By optimizing the structural parameters, the maximum refractive index sensitivity of the biosensor model can surpass 17.4 × 10/RIU, which achieves a certain competitiveness compared to conventional surface plasmon resonance (SPR) or BSW sensors. Considering that bulk materials are easier to handle than two-dimensional materials in manufacturing facilities, we judge that 3D Dirac semimetal and its related devices will provide a strong competitor and alternative to graphene-based devices.
在这项工作中，我们提出了一种基于截断一维光子晶体（1D PC）结构与狄拉克半金属的近红外敏感折射率生物传感器的理论模型。这种高灵敏度的近红外生物传感器源于在狄拉克半金属和 1D PC 之间的界面处激发布洛赫表面波（BSW）所引起的尖锐反射率峰。生物传感器模型的灵敏度对狄拉克半金属的费米能、截断层的厚度和传感介质的折射率敏感。通过优化结构参数，生物传感器模型的最大折射率灵敏度可以超过 17.4×10/RIU，与传统的表面等离子体共振（SPR）或 BSW 传感器相比具有一定的竞争力。考虑到在制造设施中，体材料比二维材料更容易处理，我们判断 3D 狄拉克半金属及其相关器件将为基于石墨烯的器件提供强有力的竞争对手和替代方案。
