A Tunable Plasmonic Refractive Index Sensor with Ultrabroad Sensing Range for Cancer Detection

A highly sensitive yet simple plasmonic refractive index (RI) sensor consisting of Au trimer hollow nanocylinders surrounded by an Ag hollow nanocylinder is proposed with a wide range of applications in the near IR range. The plasmonic behaviour of the structure is studied by analysing the absorption cross-section on illumination by electromagnetic (EM) wave using the finite element method (FEM). Nanoscale detections can be realized by using the shift in resonance wavelength of localized surface plasmon resonance (LSPR) in response to the change in RI. The optimized RI sensor gives a maximum sensitivity of 2545.4 nm/RIU, figure of merit (FOM) of 43.90 RIU−1 and sensor resolution of the order of 10−5 RIU. The proposed sensor can detect even small variations in RI of the order of 10−5 RIU with a sensitivity of 1998 nm/RIU. With the observed high sensitivity, resolution and quality, the sensor can contribute a lot to health-care applications and is found highly suitable for multiple detections covering broad range of RI including bio-analytes, chemicals, and gases.

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“…Another measuring parameter used for a finer understanding of the sensing performance is the sensor resolution given by [17]…”

Section: Design Considerations and Simulationmentioning

confidence: 99%

Theoretical modelling of Au and Ag hollow cylinders for high resolution refractive index sensing of bio-analytes and gases

Mohan¹,

Thomas

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Periodic arrays of metal nanoantennas can generate plasmonic lattice resonances (PLR), arising from the coupling between diffracted waves from the periodic array and the localized surface plasmons of the metal nanoantennas [16][17][18][19][20][21][22]. The coupling generates an enhanced electric field around the nanostructures that can be employed in plasmonic sensors that rely on shifts in their lattice resonant wavelength prompted by an alteration in the refractive indices of the ambient media [23][24][25][26][27]. The performance of a sensor based on such periodic metal arrays is determined by the figure of merit (FOM), which is the ratio of the sensitivity, defined as the shift in the wavelength of PLR per refractive index unit (RIU) to the full width at half maximum (FWHM) [28].…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Plasmonic Sensor with Au Bow Tie Nanoantennas on SiO2 Nanopillar Arrays

Venugopalan

Kumar

2023

Chemosensors

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We report on plasmonic sensors based on arrays of metallic bow tie nanoantennas with high sensitivity and an enhanced figure of merit. In the present sensing device, each gold nanoantenna is positioned on the upper surface of a SiO2 nanopillar that is placed on a quartz substrate. The presence of the nanopillar significantly reduces the coupling of the enhanced electromagnetic field generated at the plasmon resonance to the substrate. The simulated results show that the sensitivity of the device to refractive index sensing is 612 nm/RIU, calculated by the resonance wavelength shift per refractive index unit due to the change in the ambient medium index, while the full width at half maximum is calculated at around 10 nm with a figure of merit of 61. The proposed sensor thus has a great potential for sensing and detection applications.

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“…The surface plasmon resonance of a nanostructure is highly sensitive to the embedded medium and its permittivity values [6]. At the same time, size and shape also play crucial roles in their SPR response [7].…”

Section: Introductionmentioning

confidence: 99%

Theoretical modelling of a deformation based concave square ring-square disc (SR-SD) silver structure for pressure sensing

Francis

Jacob³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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A compact nanosensor that explores the tie-in between stress-induced deformation and optical resonance characteristics is theoretically proposed for pressure sensing. The structure modeling, electromagnetic (EM) wave simulation, and performance evaluations were carried out using the 2D finite element method (FEM). The proposed surface plasmon resonance (SPR) based metal-insulator-metal (MIM) model responds to the pressure induced on the top-facing side of an Ag concave square ring-square disc arrangement (Concave SR-SD) in terms of a structural curve-in into the insulator cavity. These deformations alter the electromagnetic field distributions and plasmonic resonance conditions, shifting the absorption cross-section profiles towards higher wavelengths. The shift in the resonant wavelength (Δλ) for specific measured deformations (d) exhibited by the normal SR-SD hinds at the application level perspective of the designed system in pressure sensing via its optomechanical correlation. Further, multiple parameters like insulator cavity width (W I ) and structure wise modifications in the outer ring structure are investigated for performance optimization, and subline sensitivity values (maximum) of 24.496 nm/MPa and 40.46 nm/MPa are observed from normal and concave SR-SD systems respectively. The suggested nano pressure sensor of suitable sensitivity and broad sensing range promises strong applicability in biomedicine, health monitoring, nanomechanics, chip-based devices, and nanoelectronics.

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A Tunable Plasmonic Refractive Index Sensor with Ultrabroad Sensing Range for Cancer Detection

Cited by 13 publications

References 84 publications

Theoretical modelling of Au and Ag hollow cylinders for high resolution refractive index sensing of bio-analytes and gases

Theoretical modelling of Au and Ag hollow cylinders for high resolution refractive index sensing of bio-analytes and gases

Highly Sensitive Plasmonic Sensor with Au Bow Tie Nanoantennas on SiO2 Nanopillar Arrays

Theoretical modelling of a deformation based concave square ring-square disc (SR-SD) silver structure for pressure sensing

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