Study on the Fano resonance of coupling M-type cavity based on surface plasmon polaritons

Qiao, Litao; Zhang, Guanmao; Wang, Zhishuang; Fan, Guanping; Yan, Y.

doi:10.1016/j.optcom.2018.09.055

Cited by 69 publications

(34 citation statements)

References 34 publications

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“…A suitable refractive index sensor simultaneously possesses the high sensitivity ( S ) and figure of merit (FOM) [ 90 , 91 , 92 , 93 , 94 , 95 , 96 ]. Figure 6 illustrates the resonance wavelength (λ res ) versus the refractive index ( n ) of the cases without and with Ag baffles concerning L = 600 nm in mode 1 to mode 4.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…where T() is the transmittance at the specific wavelength, and dT()/dn() is the transmittance change at the fixed wavelength induced by a refractive index change. According to (10) and (11)…”

Section: Resultsmentioning

confidence: 99%

“…The spectral lines of Fano resonance are much narrower as compared with the regular Lorentzian line shape. Thus, the plasmonic refractive index sensors based on various MDM waveguide coupled resonator systems with Fano resonance have been proposed and investigated [9][10][11][12][13][14]. Wen et al proposed an MDM-waveguide structure coupled with an end-coupled ring groove [9].…”

Section: Introductionmentioning

confidence: 99%

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High Sensitivity Plasmonic Metal-Dielectric-Metal Device With Two Side-Coupled Fano Cavities

et al. 2019

Photonic Sens

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In this paper, we propose a compact plasmonic sensor structure comprised of a metal-dielectric-metal (MDM) waveguide, and a baffle plate in waveguide core and two side-coupled rectangular cavities. In this structure, two Fano resonances are achieved and can be tuned independently by changing the structural parameters of the cavities. Especially, when the resonant wavelengths of the two Fano resonances are the same, the sensing sensitivity can be enhanced by coupling between two Fano resonances. By investigating the transmission spectrum, the effect of structural parameters on Fano resonances and the refractive index sensitivity of the sensor structure are analyzed in detail. The numerical simulations demonstrate a sensitivity as high as 1295nm/RIU and a figure of merit of 1647.

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“…It can overcome the conventional optical diffraction limit and achieve the transmission and manipulating of the optical signal within the subwavelength scale [ 7 , 8 ]. Plasmonic metal-insulator-metal (MIM) waveguides based on SPPs as a potential branch of optical waveguides are extensively investigated due to their easy on-chip integration, low bent loss, long propagation length, deep subwavelength confinement, and reasonably simple manufacture [ 9 , 10 , 11 , 12 ]. Plasmonic refractive index sensors based on MIM waveguides [ 13 , 14 , 15 ] have attracted numerous considerations because of the requirement for ultrahigh-sensitivity biochemical sensors [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods

et al. 2020

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We numerically and theoretically investigate a highly sensitive and tunable plasmonic refractive index sensor that is composed of a metal-insulator-metal waveguide with a side-coupled nanoring, containing silver nanorods using the finite element method. Results reveal that the presence of silver nanorods in the nanoring has a significant impact on sensitivity and tunability performance. It gives a flexible way to tune the system response in the proposed structure. Our designed sensor has a sensitivity of 2080 nm/RIU (RIU is the refractive index unit) along with a figure of merit and a quality factor of 29.92 and 29.67, respectively. The adequate refractive index sensitivity can increase by adding the silver nanorods in a nanoring, which can induce new surface plasmon polaritons (SPPs) modes that cannot be found by a regular nanoring. For a practical application, a valid introduction of silver nanorods in the nanoring can dramatically reduce the dimension of the proposed structure without sacrificing performance.

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Study on the Fano resonance of coupling M-type cavity based on surface plasmon polaritons

Cited by 69 publications

References 34 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

High Sensitivity Plasmonic Metal-Dielectric-Metal Device With Two Side-Coupled Fano Cavities

Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods

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