Transmission and refractive index sensing based on Fano resonance in MIM waveguide-coupled trapezoid cavity

Zhou, Jinli; Chen, Huibin; Zhang, Zhidong; Tang, Jun; Cui, Jiangong; Chen, Xue; Su, Yan

doi:10.1063/1.4974075

Cited by 28 publications

(12 citation statements)

References 30 publications

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“…Taking advantage of MIM waveguides, various plasmonic devices can be designed and manufactured [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Recently, cavity resonance formed in MIM waveguides to obtain wavelength filtering and refractive index sensing functions has been investigated by theoretical estimations and experimental verifications [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Several resonance modes can be excited in the straight waveguide coupled with the resonance cavity under SPPs conditions, which are highly sensitive to the refractive index’s variation and the cavity’s shape [ 38 , 39 , 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

et al. 2020

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A plasmonic metal-insulator-metal waveguide filter consisting of one rectangular cavity and three silver baffles is numerically investigated using the finite element method and theoretically described by the cavity resonance mode theory. The proposed structure shows a simple shape with a small number of structural parameters that can function as a plasmonic sensor with a filter property, high sensitivity and figure of merit, and wide bandgap. Simulation results demonstrate that a cavity with three silver baffles could significantly affect the resonance condition and remarkably enhance the sensor performance compared to its counterpart without baffles. The calculated sensitivity (S) and figure of merit (FOM) in the first mode can reach 3300.00 nm/RIU and 170.00 RIU−1. Besides, S and FOM values can simultaneously get above 2000.00 nm/RIU and 110.00 RIU−1 in the first and second modes by varying a broad range of the structural parameters, which are not attainable in the reported literature. The proposed structure can realize multiple modes operating in a wide wavelength range, which may have potential applications in the on-chip plasmonic sensor, filter, and other optical integrated circuits.

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Section: Introductionmentioning

confidence: 99%

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

et al. 2020

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“…Among these, the SPPs-based nanosensor is a significant application, which has advantages of smaller size as well as being easy to integrate into optical circuits and get in touch with sensing mediums. In addition, Fano resonance [20][21][22][23][24][25] is observed in plasmon coupled structures, which is generated by the interference between narrowband mode and broadband mode. According to previous works, making proper defects on waveguide or resonator cavity has a big chance to form Fano resonance.…”

Section: Introductionmentioning

confidence: 99%

A Nanostructure with Defect Based on Fano Resonance for Application on Refractive-Index and Temperature Sensing

Yang

Hua

et al. 2020

Sensors

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Herein, a nanosensor structure is proposed, which comprises metal-insulator-metal (MIM) waveguide with stub and circular ring cavity with a stub (CRCS). The phenomenon of Fano resonance appears in the transmission spectrum, which is formed by interaction between the narrowband mode of CRCS and broadband mode of stub on bus waveguide. The influence of geometric asymmetry on mode splitting of Fano resonance was discussed. The mode splitting of Fano resonance can vastly improve figure of merit (FOM) with a sight decrease of sensitivity. The best performance of the refractive-index nanosensor is attained, which is 1420 nm/RIU with a high FOM of 76.76. Additionally, the application of designed structure on temperature sensing was investigated, which has sensitivity of 0.8 nm/°C. The proposed structure also possesses potential applications on other on-chip nanosensors.

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“…Therefore, one significant factor for designing an SPPs-based sensor is improving its sensitivity. In addition, numerous interesting optical phenomena were observed in plasmon coupled structures, for example, plasmon-induced transparency (PIT) [18] and Fano resonance [19]- [21]. Fano resonance has wide application because it emerges an asymmetric sharp outline and displays comparatively narrow full width at half maximum (FWHM) [22].…”

Section: Introductionmentioning

confidence: 99%

Refractive Index Nanosensor With Simple Structure Based on Fano Resonance

et al. 2020

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Herein, a refractive-index sensor is theoretically proposed, which comprises metal-insulator-metal waveguide and single rectangle cavity without a long side (RCWALS). The propagation characteristics were analyzed by finite element method. Compared with the contrastive structure, the designed single RCWALS structure has better transmission spectra and stronger resonance and supports Fano resonance. The effects of the structural parameters on sensing characteristics were investigated. Mode 1 of single RCWALS structure has better performance parameter, which is the best sensitivity of 1840 nm/RIU with a figure of merit of 51.11. Additionally, three derived structures are presented, which are composed of MIM waveguide and two RCWALS in different positions. They have lower sensitivity but better figure of merit, and provide more detection positions. The designed structures, which are greatly simple, can potentially apply to nanophotonics.

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Transmission and refractive index sensing based on Fano resonance in MIM waveguide-coupled trapezoid cavity

Cited by 28 publications

References 30 publications

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

A Nanostructure with Defect Based on Fano Resonance for Application on Refractive-Index and Temperature Sensing

Refractive Index Nanosensor With Simple Structure Based on Fano Resonance

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