MIM waveguide structure consisting of a semicircular resonant cavity coupled with a key-shaped resonant cavity

Zhu, Jun; Li, Na

doi:10.1364/oe.395696

Cited by 97 publications

(40 citation statements)

References 32 publications

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“…The default values are the best structure parameters and the properties is better than most of those that are listed in Table 1. [31] 1262 [27] 1180 [32] 1295 [28] 1350 [33] 1120 [29] 1075 [34] 1949 [30] 1200 [35] 2080…”

Section: Resultsmentioning

confidence: 99%

Study on the Nanosensor Based on a MIM Waveguide with a Stub Coupled with a Horizontal B-Type Cavity

et al. 2021

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Due to their compact size and high sensitivity, plasmonic sensors have become a hot topic in the sensing field. A nanosensor structure, comprising the metal–insulator–metal (MIM) waveguide with a stub and a horizontal B-Type cavity, is designed as a refractive index sensor. The spectral characteristics of proposed structure are analyzed via the finite element method (FEM). The results show that there is a sharp Fano resonance profile, which is excited by a coupling between the MIM waveguide and the horizontal B-Type cavity. The normalized HZ field is affected by the difference value between the outer radii R1 and R2 of the semi-circle of the horizontal B-Type cavity greatly. The influence of every element of the whole system on sensing properties is discussed in depth. The sensitivity of the proposed structure can obtain 1548 nm/RIU (refractive index unit) with a figure of merit of 59. The proposed structure has potential in nanophotonic sensing applications.

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Section: Resultsmentioning

confidence: 99%

Study on the Nanosensor Based on a MIM Waveguide with a Stub Coupled with a Horizontal B-Type Cavity

et al. 2021

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“…Various optical devices have been designed based on SPPs such as filters, directional couplers, modulators, beam splitters, plasmonic diodes, wavelength division multiplexers (WDM), slow light devices, logic gates, all-optical switches, sensors, and so forth [4,[23][24][25][26][27][28][29]. Among them, a plasmonic sensor that composes of a metal-insulator-metal (MIM) bus waveguide coupled to a resonator (or several cavities), has become the most promising structure because they acquire the merits of simple form, strong electromagnetic (EM) wave confinement and flexibility, slight band loss, long propagation distance, and ease of fabrication [30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Improved Refractive Index-Sensing Performance of Multimode Fano-Resonance-Based Metal-Insulator-Metal Nanostructures

et al. 2021

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This work proposed a multiple mode Fano resonance-based refractive index sensor with high sensitivity that is a rarely investigated structure. The designed device consists of a metal–insulator–metal (MIM) waveguide with two rectangular stubs side-coupled with an elliptical resonator embedded with an air path in the resonator and several metal defects set in the bus waveguide. We systematically studied three types of sensor structures employing the finite element method. Results show that the surface plasmon mode’s splitting is affected by the geometry of the sensor. We found that the transmittance dips and peaks can dramatically change by adding the dual air stubs, and the light–matter interaction can effectively enhance by embedding an air path in the resonator and the metal defects in the bus waveguide. The double air stubs and an air path contribute to the cavity plasmon resonance, and the metal defects facilitate the gap plasmon resonance in the proposed plasmonic sensor, resulting in remarkable characteristics compared with those of plasmonic sensors. The high sensitivity of 2600 nm/RIU and 1200 nm/RIU can simultaneously achieve in mode 1 and mode 2 of the proposed type 3 structure, which considerably raises the sensitivity by 216.67% for mode 1 and 133.33% for mode 2 compared to its regular counterpart, i.e., type 2 structure. The designed sensing structure can detect the material’s refractive index in a wide range of gas, liquids, and biomaterials (e.g., hemoglobin concentration).

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“…Wang et al designed an isosceles triangular cavity with a sensitivity of about 1200 nm/RIU [ 23 ]. Additionally, Zhu et al proposed a key-shaped cavity achieving a sensitivity of 1261.67 nm/RIU [ 24 ]. Butt et al proposed a Nanodots decorated asymmetric metal-insulator-metal waveguide resonator structure with a sensitivity of 2464 nm/RIU [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator

et al. 2021

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A nanostructure comprising the metal-insulator-metal (MIM) bus waveguide with a stub coupled with a racetrack ring resonator is designed. The spectral characteristics of the proposed structure are analyzed via the finite element method (FEM). The results show that there is a sharp Fano resonance profile and electromagnetically induced transparency (EIT)-like effect, which are excited by a coupling between the MIM bus waveguide with a stub and the racetrack ring resonator. The normalized HZ field is affected by the displacement of the ring from the stub x greatly. The influence of the geometric parameters of the sensor design on the sensing performance is discussed. The sensitivity of the proposed structure can reach 1774 nm/RIU with a figure of merit of 61. The proposed structure has potential in nanophotonic sensing applications.

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MIM waveguide structure consisting of a semicircular resonant cavity coupled with a key-shaped resonant cavity

Cited by 97 publications

References 32 publications

Study on the Nanosensor Based on a MIM Waveguide with a Stub Coupled with a Horizontal B-Type Cavity

Study on the Nanosensor Based on a MIM Waveguide with a Stub Coupled with a Horizontal B-Type Cavity

Improved Refractive Index-Sensing Performance of Multimode Fano-Resonance-Based Metal-Insulator-Metal Nanostructures

A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator

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