Terahertz Biosensor Based on Mode Coupling between Defect Mode and Optical Tamm State with Dirac Semimetal

被引：3

作者：

Bao, Yuwen ^{[1
]}

Ren, Mengjiao ^{[1
]}

Ji, Chengpeng ^{[1
]}

Dong, Jun ^{[1
,2
]}

Jiang, Leyong ^{[1
]}

Dai, Xiaoyu ^{[3
]}

机构：

[1] Hunan Normal Univ, Sch Phys & Elect, Changsha 410081, Peoples R China

[2] Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Peoples R China

[3] Hunan Univ, Sch Phys & Elect, Changsha 410082, Peoples R China

来源：

BIOSENSORS-BASEL | 2022年 / 12卷 / 11期

基金：

中国国家自然科学基金;

关键词：

biosensor; mode coupling; Dirac semimetal; optical Tamm state; SPR SENSORS; PLASMON; SENSITIVITY;

D O I：

10.3390/bios12111050

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Bulk Dirac semimetal (BDS) has emerged as a "3D graphene" material for the development of optical devices in the past few years. In this study, a BDS-based tunable highly sensitive terahertz (THz) biosensor is proposed by using a Dirac semimetal/Bragg reflector multilayer structure. The high sensitivity of the biosensor originates from the sharp Fano resonance peak caused by coupling the Optical Tamm State (OTS) mode and defect mode. Besides, the sensitivity of the proposed structure is sensitive to the Fermi energy of Dirac semimetal and the refractive index of the sensing medium. The maximum sensitivity of 1022 degrees/RIU is obtained by selecting structural and material parameter appropriately, which has certain competitiveness compared to conventional surface plasmon resonance (SPR) sensors. From the standpoint of the fabrication facility and integration, we judged that the BDS-based layered structure has the potential application in biosensor field.

引用

页数：10

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