Refractive index sensor and filter of metal-insulator-metal waveguide based on ring resonator embedded by cross structure

doi:10.7498/aps.67.20180758

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	Refractive index sensor and filter of metal-insulator-metal waveguide based on ring resonator embedded by cross structure
	Qi Yun-Ping 1; Zhang Xue-Wei 1; Zhou Pei-Yang 1; Hu Bing-Bing 1; Wang Xiang-Xian 2
刊名	ACTA PHYSICA SINICA
	2018-10-05
卷号	67 期号:19
关键词	surface plasmon polaritons refractive index sensors metal-insulator-metal waveguides optical resonators
ISSN号	1000-3290
DOI	10.7498/aps.67.20180758
英文摘要	Continuous improvement in nanofabrication and nano-characterization capabilities have changed projections about the role that metals could play in developing the new optical devices. Surface plasmon polaritons are evanescent waves that propagate along a metal-dielectric interface. They can be laterally confined below the diffraction limit by using subwavelength metal structures, rendering them attractive to the development of miniaturized optical devices. A surface plasmon polariton refractive index sensor and filter which consist of two metal-insulator-metal (MIM) waveguides coupled to each other by a ring resonator embedded by cross structure are proposed. And the transmission characteristics of surface plasmon polaritons are studied in our proposed structure. The transmission properties of such a structure are simulated by the finite element method, and the eigenvalue wavelengths of the ring resonator are calculated theoretically. The sensing characteristics of such a structure are systematically analyzed by investigating the transmission spectrum. The results show that there are three resonance peaks in the transmission spectrum, that is, three resonance modes corresponding to the eigenvalue solutions of the first, second and third-order Bessel eigen-function equations, and each of which has a linear relationship with the refractive index of the material under sensing. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity (S) as high as 1500 nm/RIU, and the corresponding sensing resolution is 1.33 x 10(-4) RIU. More importantly, it is sensitive to none of the parameters of our proposed structure, which means that the sensitivity of the sensor is immune to the fabrication deviation. In addition, by the resonant theory of ring resonator, we find a linear relationship between the resonance wavelength and the radius of ring resonator. So the resonance wavelength can be easily manipulated by adjusting the radius and refractive index. In addition, the positions of transmission peaks can be easily modulated by changing the radius of the ring, which can be used to design band-pass filter for a large wavelength range. Moreover, the transmission intensity and the transmission bandwidth decrease as spacing distance between the MIM waveguide and ring cavity increases. These results would be helpful in designing the refractive index sensor of high-sensitivity and band-pass filters, and have guiding significance for biological sensor applications.
资助项目	Northwest Normal University "Graduate Student Innovation Ability Enhancement Program" Foundation, China[CX2018Y167]
WOS研究方向	Physics
语种	中文
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000448517700027
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32404]
专题	理学院
通讯作者	Qi Yun-Ping
作者单位	1.Northwest Normal Univ, Engn Res Ctr Gansu Prov Intelligent Informat Tech, Coll Phys & Elect Engn, Lanzhou 730070, Gansu, Peoples R China 2.Lanzhou Univ Technol, Sch Sci, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Qi Yun-Ping,Zhang Xue-Wei,Zhou Pei-Yang,et al. Refractive index sensor and filter of metal-insulator-metal waveguide based on ring resonator embedded by cross structure[J]. ACTA PHYSICA SINICA,2018,67(19).
APA	Qi Yun-Ping,Zhang Xue-Wei,Zhou Pei-Yang,Hu Bing-Bing,&Wang Xiang-Xian.(2018).Refractive index sensor and filter of metal-insulator-metal waveguide based on ring resonator embedded by cross structure.ACTA PHYSICA SINICA,67(19).
MLA	Qi Yun-Ping,et al."Refractive index sensor and filter of metal-insulator-metal waveguide based on ring resonator embedded by cross structure".ACTA PHYSICA SINICA 67.19(2018).