Design of Ultra-Narrow Band Graphene Refractive Index Sensor

被引：243

作者：

Shangguan, Qianyi ^{[1
]}

Chen, Zihao ^{[2
]}

Yang, Hua ^{[3
]}

Cheng, Shubo ^{[1
]}

Yang, Wenxing ^{[1
]}

Yi, Zao ^{[4
]}

Wu, Xianwen ^{[5
]}

Wang, Shifa ^{[6
]}

Yi, Yougen ^{[7
]}

Wu, Pinghui ^{[8
]}

机构：

[1] Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China

[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Film & Integrated Device, Sch Elect Sci & Engn, Chengdu 610054, Peoples R China

[3] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China

[4] Southwest Univ Sci & Technol, Joint Lab Extreme Condit Matter Properties, Mianyang 621010, Sichuan, Peoples R China

[5] Jishou Univ, Sch Chem & Chem Engn, Jishou 416000, Peoples R China

[6] Chongqing Three Gorges Univ, Sch Elect & Informat Engn, Chongqing 404000, Peoples R China

[7] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China

[8] Quanzhou Normal Univ, Fujian Prov Key Lab Adv Micronano Photon Technol, Quanzhou 362000, Peoples R China

来源：

SENSORS | 2022年 / 22卷 / 17期

基金：

中国国家自然科学基金;

关键词：

graphene; ultra-narrow band; refractive index sensor; terahertz waves; IMPRINTED ELECTROCHEMICAL SENSOR; PHOTOCATALYTIC PERFORMANCE; FLUORESCENT DETECTION; INDUCED TRANSPARENCY; FACILE SYNTHESIS; QUANTUM DOTS; ABSORBER; TETRABROMOBISPHENOL; OPTIMIZATION; NANOCRYSTALS;

D O I：

10.3390/s22176483

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The paper proposes an ultra-narrow band graphene refractive index sensor, consisting of a patterned graphene layer on the top, a dielectric layer of SiO2 in the middle, and a bottom Au layer. The absorption sensor achieves the absorption efficiency of 99.41% and 99.22% at 5.664 THz and 8.062 THz, with the absorption bandwidths 0.0171 THz and 0.0152 THz, respectively. Compared with noble metal absorbers, our graphene absorber can achieve tunability by adjusting the Fermi level and relaxation time of the graphene layer with the geometry of the absorber unchanged, which greatly saves the manufacturing cost. The results show that the sensor has the properties of polarization-independence and large-angle insensitivity due to the symmetric structure. In addition, the practical application of testing the content of hemoglobin biomolecules was conducted, the frequency of first resonance mode shows a shift of 0.017 THz, and the second resonance mode has a shift of 0.016 THz, demonstrating the good frequency sensitivity of our sensor. The S (sensitivities) of the sensor were calculated at 875 GHz/RIU and 775 GHz/RIU, and quality factors FOM (Figure of Merit) are 26.51 and 18.90, respectively; and the minimum limit of detection is 0.04. By comparing with previous similar sensors, our sensor has better sensing performance, which can be applied to photon detection in the terahertz band, biochemical sensing, and other fields.

引用

页数：13