Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators

doi:10.1088/1674-1056/abf922

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 104210-104210.doi: 10.1088/1674-1056/abf922

Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators

Changsong Wu(伍长松) and Jun Zhu(朱君)^†

College of Electronic Engineering, Guangxi Normal University, Guilin 541004, China

收稿日期:2020-12-17 修回日期:2021-02-20 接受日期:2021-04-19 发布日期:2021-09-17
通讯作者: Jun Zhu E-mail:zhujun1985@gxnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51965007) and the “One thousand Young and Middle-Aged College and University Backbone Teachers Cultivation Program” of Guangxi, China (Grant No. 2019).

Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators

Changsong Wu(伍长松) and Jun Zhu(朱君)^†

College of Electronic Engineering, Guangxi Normal University, Guilin 541004, China

Received:2020-12-17 Revised:2021-02-20 Accepted:2021-04-19 Published:2021-09-17
Contact: Jun Zhu E-mail:zhujun1985@gxnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51965007) and the “One thousand Young and Middle-Aged College and University Backbone Teachers Cultivation Program” of Guangxi, China (Grant No. 2019).

摘要/Abstract

摘要： Developing a convenient method that can be routinely applied for ascertaining proportions of different vegetable oils employed in commercial blended edible oils remains a significant challenge. We address this issue by proposing a novel method for detecting volume fraction of different oils based on the fact that these oils are optically transparent and have slightly different indices of refraction at a given temperature and wavelength. Accordingly, we develop a highly sensitive sensor for measuring the index of refraction of oil blends based on Fano resonance spectra obtained using a metal-insulator-metal (MIM) waveguide structure comprising a gapped straight waveguide coupled with two L-shaped resonators. The index of refraction sensitivity and figure of merit of the structure are calculated based on modeling using the finite element method, and the waveguide structure is accordingly optimized by adjusting the different geometric parameters to achieve a high-quality Fano resonance spectrum. The optimized structure achieves an ultra-high refractive index sensitivity of 770 nm/RIU in terms of a refractive index unit (RIU) of 1. Moreover, a highly stable linear relationship is obtained between the refractive index of mixed edible oils and the resonance wavelength. Experimental results demonstrate that the proposed structure can detect slight changes in the volume fractions of the components in blended oils.

关键词: Fano resonance refractive index sensing, metal-insulator-metal (MIM) waveguide, volume fraction detection

Abstract: Developing a convenient method that can be routinely applied for ascertaining proportions of different vegetable oils employed in commercial blended edible oils remains a significant challenge. We address this issue by proposing a novel method for detecting volume fraction of different oils based on the fact that these oils are optically transparent and have slightly different indices of refraction at a given temperature and wavelength. Accordingly, we develop a highly sensitive sensor for measuring the index of refraction of oil blends based on Fano resonance spectra obtained using a metal-insulator-metal (MIM) waveguide structure comprising a gapped straight waveguide coupled with two L-shaped resonators. The index of refraction sensitivity and figure of merit of the structure are calculated based on modeling using the finite element method, and the waveguide structure is accordingly optimized by adjusting the different geometric parameters to achieve a high-quality Fano resonance spectrum. The optimized structure achieves an ultra-high refractive index sensitivity of 770 nm/RIU in terms of a refractive index unit (RIU) of 1. Moreover, a highly stable linear relationship is obtained between the refractive index of mixed edible oils and the resonance wavelength. Experimental results demonstrate that the proposed structure can detect slight changes in the volume fractions of the components in blended oils.

Key words: Fano resonance refractive index sensing, metal-insulator-metal (MIM) waveguide, volume fraction detection

中图分类号: (Nonlinear optics)

42.65.-k

42.79.-e (Optical elements, devices, and systems) 42.81.Pa (Sensors, gyros) 71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions))

Changsong Wu(伍长松) and Jun Zhu(朱君). Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators[J]. 中国物理B, 2021, 30(10): 104210-104210.

Changsong Wu(伍长松) and Jun Zhu(朱君). Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators[J]. Chin. Phys. B, 2021, 30(10): 104210-104210.

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Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators

Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators

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