Split Ring Resonators-Based Plasmonics Sensor With Dual Fano Resonances

被引:20
|
作者
Sharma, Yazusha [1 ,2 ]
Zafar, Rukhsar [1 ]
Metya, Sanjeev Kumar [3 ]
Kanungo, Vinay [1 ]
机构
[1] Swami Keshvanand Inst Technol Management & Gramot, Dept Elect & Commun Engn, Jaipur 302017, Rajasthan, India
[2] Jaipur Engn Coll & Res Ctr JECRC, Dept Elect & Commun Engn, Jaipur 302022, Rajasthan, India
[3] Natl Inst Technol Arunachal Pradesh, Dept Elect & Commun Engn, Yupia 791112, India
关键词
Plasmonics sensor; split ring resonators; dual-fano resonance; figure of merit; sensitivity;
D O I
10.1109/JSEN.2020.3043377
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Plasmonics is garnering the attention in the field of optical sensing due to the unique interaction of light with noble metals which enables sub-wavelength confinement. Here in this paper, a Plasmonic sensor based on coupled split ring resonators is proposed. The interaction between split resonatorsis theoreticallystudiedand numerically investigated using Finite Difference Time Domain method. Dual Fano resonances are observed in the transmission spectrum with an ultra-narrow line width (Delta lambda = 7 nm) and large Quality factor (Q = 185). The resonant wavelength demonstrates a linear dependence with the refractive index of the sensing region. An intriguing feature of the designed sensor is that both the Fano peaks exhibit different value of sensitivities i.e. S-I = 1050 nm/RIU and S-II = 1965 nm/RIU for peak I and II respectively which is beneficial in terms of optical sensing. The performance of sensor is also studied for variation in geometrical parameters such as the gap between the split ring resonators. High Figure of Merit (FOM) of 328 RIU-1 is obtained from the structure with a gap of 20 nm. Sensitivity is stable with respect to fabrication tolerances (+/- 10%) of gap (g). The proposed structure can be useful in designing optical glucometer with better sensitivity and resolution. The structure can be modified to finds its applicability in chemical sensing and different biological applications.
引用
收藏
页码:6050 / 6055
页数:6
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