Independently tunable dual resonant dip refractive index sensor based on metal–insulator–metal waveguide with Q-shaped resonant cavity

Chen, Haowen; Qi, Yunping; Ding, Jinghui; Yuan, Yujiao; Tian, Zhenting; Wang, Xiangxian

doi:10.1088/1674-1056/ac48fe

Cited by 15 publications

(6 citation statements)

References 43 publications

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“…Because air has a very low dielectric loss and magnetic loss, and its relative dielectric constant is e i (e = 1 i ). Silver (Ag), a metal with excellent electrical conductivity and stability, has a relative dielectric constant of e , m which can be expressed by Drude model as follows [19,25]: where, e ¥ is the dielectric constant of the metal when w w . There are two polarization states in the electromagnetic field, which are divided into TE and TM mode [26].…”

Section: Structure Designmentioning

confidence: 99%

A dual-purpose sensor with a sawtooth U-shaped cavity and a rectangle-shaped cavity in a MIM waveguide structure

et al. 2023

Phys. Scr.

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To improve the performance of subwavelength refractive index and temperature sensors, this paper proposes a subwavelength metal-insulator-metal (MIM) waveguide structure consisting of a sawtooth U-shaped cavity and a rectangular cavity based on surface plasmon polaritons. The transmission spectrum of the system is simulated using the finite element method (FEM) and verified with multi-mode interference coupled-mode theory (MICMT). The results demonstrate excellent sensing characteristics for the system, with a refractive index sensitivity of 1300 nm/RIU, a figure of merit (FOM*) of 191.262, and a temperature sensitivity of 0.525 nm/℃. This indicates that the nano-plasma system is highly significant in refractive index and temperature sensing.

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Section: Structure Designmentioning

confidence: 99%

A dual-purpose sensor with a sawtooth U-shaped cavity and a rectangle-shaped cavity in a MIM waveguide structure

et al. 2023

Phys. Scr.

Self Cite

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Section: Introductionmentioning

confidence: 99%

“…MIM waveguide-based plasmonic sensors have many advantages, including high sensitivity, high resolution, and the ability to detect small changes in the refractive index of the sample [16][17][18][19]. They can be used in various applications, such as chemical sensing, biosensing, and environmental monitoring [17,[20][21][22][23][24]. However, they also have some limitations, including the requirement for specialized fabrication techniques and the difficulty of integrating them with other technologies, such as microfluidics or electronics [25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Assessment of a Metal-Insulator-Metal Waveguide-Based Plasmonic Sensor System for the Recognition of Tuberculosis in Blood Plasma

Butt

2023

Micromachines

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In this paper, a numerical analysis of a plasmonic sensor based on a metal-insulator-metal (MIM) waveguide is conducted for the detection of tuberculosis (TB)-infected blood plasma. It is not straightforward to directly couple the light to the nanoscale MIM waveguide, because of which two Si3N4 mode converters are integrated with the plasmonic sensor. This allows the efficient conversion of the dielectric mode into a plasmonic mode, which propagates in the MIM waveguide via an input mode converter. At the output port, the plasmonic mode is converted back to the dielectric mode via the output mode converter. The proposed device is employed to detect TB-infected blood plasma. The refractive index of TB-infected blood plasma is slightly lower than that of normal blood plasma. Therefore, it is important to have a sensing device with high sensitivity. The sensitivity and figure of merit of the proposed device are ~900 nm/RIU and 11.84, respectively.

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“…The SPPs propagate along the metal dielectric interface and decay exponentially on both sides of the surface [1][2][3][4][5][6][7][8]. By surpassing the limits of conventional diffraction, SPPs enable the confinement of light to subwavelength scales [9,10]. In recent years, metal-insulator-metal (MIM) waveguide structures have gained significant attention due to their ease of integration, reduced transmission losses, and effective confinement of the electromagnetic field.…”

Section: Introductionmentioning

confidence: 99%

Independently tunable refractive index sensor based on metal-insulator-metal waveguide with key-shaped resonator and application in human blood plasma detection

Zhao

Chen

et al. 2023

Phys. Scr.

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In this paper, a metal-insulator-metal waveguide structure based on a key-shaped resonator is proposed. Firstly, the structure is simulated using the finite difference in time domain (FDTD) method, revealing the generation of three resonant peaks. And the theoretical results are then analyzed using multimode interference coupled mode theory (MICMT), demonstrating a high level of agreement with the simulation results. Then the parameters of the structure are adjusted, so that the resonant peaks can be tuned independently. Notably, the structure exhibits a maximum sensitivity of 1520 nm/RIU with a figure of merit (FOM*) of 195.89, highlighting its exceptional sensing capabilities. Additionally, an analysis of the asymmetric structure reveals the emergence of a new Fano resonance. Due to its outstanding sensing performance, the structure holds potential for applications blood plasma concentration testing. Feasibility is assessed in terms of blood plasma concentration detection, achiveing a maximum sensitivity of 3.07 nm · L/g. As a result, this structure offers promising opportunities in the field of on-chip optical integration and the biomedical field, among others.

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Independently tunable dual resonant dip refractive index sensor based on metal–insulator–metal waveguide with Q-shaped resonant cavity

Cited by 15 publications

References 43 publications

A dual-purpose sensor with a sawtooth U-shaped cavity and a rectangle-shaped cavity in a MIM waveguide structure

A dual-purpose sensor with a sawtooth U-shaped cavity and a rectangle-shaped cavity in a MIM waveguide structure

Numerical Assessment of a Metal-Insulator-Metal Waveguide-Based Plasmonic Sensor System for the Recognition of Tuberculosis in Blood Plasma

Independently tunable refractive index sensor based on metal-insulator-metal waveguide with key-shaped resonator and application in human blood plasma detection

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