High-sensitivity integrated devices based on surface plasmon resonance for sensing applications

Elshorbagy, Mahmoud H.; Cuadrado, Alexander; Alda, Javier

doi:10.1364/prj.5.000654

Cited by 53 publications

(24 citation statements)

References 49 publications

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“…In most of the commercially available SPR devices, the excitation of SPR is based on a Kretschman configuration, which requires light-prism coupling under oblique incidence [6]. As an improvement, the excitation of SPRs in normal incidence conditions is key to simplify the optical scheme, ease the illumination and acquisition signal system, allowing a lower cost solution [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Narrow Absorption in ITO-Free Perovskite Solar Cells for Sensing Applications Analyzed through Electromagnetic Simulation

2019

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This work reports on a computational analysis of how a modified perovskite cell can work as a refractometric sensor by generating surface plasmon resonances at its front surface. Metal-dielectric interfaces are necessary to excite plasmonic resonances. However, if the transparent conductor (ITO) is replaced by a uniform metal layer, the optical absorption at the active layer decreases significantly. This absorption enhances again when the front metallic surface is nanostructured, adding a periodic extruded array of high aspect-ratio dielectric pyramids. This relief excites surface plasmon resonances through a grating coupling mechanism with the metal surface. Our design allows a selective absorption in the active layer of the cell with a spectral response narrower than 1 nm. The photo-current generated by the cells becomes the signal of the sensor. The device employs an opto-electronic interrogation method, instead of the well-known spectral acquisition scheme. The sensitivity and figure of merit (FOM) parameters applicable to refractometric sensors were adapted to this new situation. The design has been customized to sense variations in the index of refraction of air between 1.0 and 1.1. The FOM reaches a maximum value of 1005 RIU − 1 , which is competitive when considering some other advantages, as the easiness of the acquisition signal procedure and the total cost of the sensing system. All the geometrical and material parameters included in our design were selected considering the applicable fabrication constrains.

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Section: Introductionmentioning

confidence: 99%

Narrow Absorption in ITO-Free Perovskite Solar Cells for Sensing Applications Analyzed through Electromagnetic Simulation

2019

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“…One can see that the FWHM values are slightly decreased from 27 to 8 nm as n s increased from 1.30 to 1.45. Furthermore, FOM is expressed as [26] = l ( ) ( )…”

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confidence: 99%

Significantly enhanced sensitivity using a gold aperture arrays-dielectric hybrid structure in optical fiber sensor

Xiao

Pan

et al. 2019

J. Phys. Commun.

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In this paper, we propose a novel gold aperture arrays-dielectric hybrid structure in optical fiber sensor (OFS) based on the extraordinary optical transmission (EOT) property to explore the possibility of increasing its sensitivity. Numerical investigations show that the match between effective indices of the fundamental core mode and surface plasmon polariton (SPP) mode of gold aperture arraysdielectric interface affects the sensitivity enhancement by using mode analysis approach. The essential parameters of the hybrid structure including the gold film thickness and dielectric refractive index (RI) as well as its thickness, which affect the EOT, are discussed and optimized. An average sensitivity of 180±7 nm/RIU in the sensing range 1.30-1.45 with high linearity is obtained. It is demonstrated that a significant sensitivity enhancement with a dielectric layer (its RI is 1.90 and its thickness is 50 nm) up to 105 arbitrary units (∼140%) is clearly observed more than that without a dielectric layer. The averaged figure of merit (FOM) of the proposed OFS is calculated to be 12.5 RIU −1 . Our findings indicate that this proposed hybrid structure may offer great potential in designing and optimizing a high-performance OFS.

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“…More precisely, they can also promote the excitation of surface plasmon resonances (SPR), hybrid Fano responses, guiding modes, and grating coupling. These phenomena generate a wide variety of spectral responses that improve the sensitivity, S B , and figure of merit (FOM) of the sensors [3][4][5]. The spectral line shape and the spatial and spectral location of the resonances depend on: (i) the dimensions of the nanostructure as well as, (ii) the optical properties of the chosen materials.…”

Section: Introductionmentioning

confidence: 99%

Opto-Electronic Refractometric Sensor Based on Surface Plasmon Resonances and the Bolometric Effect

et al. 2020

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The bolometric effect allows us to electrically monitor spectral characteristics of plasmonic sensors; it provides a lower cost and simpler sample characterization compared with angular and spectral signal retrieval techniques. In our device, a monochromatic light source illuminates a spectrally selective plasmonic nanostructure. This arrangement is formed by a dielectric low-order diffraction grating that combines two materials with a high-contrast in the index of refraction. Light interacts with this structure and reaches a thin metallic layer, that is also exposed to the analyte. The narrow absorption generated by surface plasmon resonances hybridized with low-order grating modes, heats the metal layer where plasmons are excited. The temperature change caused by this absorption modifies the resistance of a metallic layer through the bolometric effect. Therefore, a refractometric change in the analyte varies the electric resistivity under resonant excitation. We monitor the change in resistance by an external electric circuit. This optoelectronic feature must be included in the definition of the sensitivity and figure of merit (FOM) parameters. Besides the competitive value of the FOM (around 400 RIU − 1 , where RIU means refractive index unit), the proposed system is fully based on opto-electronic measurements. The device is modeled, simulated and analyzed considering fabrication and experimental constrains. The proposed refractometer behaves linearly within a range centered around the index of refraction of aqueous media, n ≃ 1.33 , and can be applied to the sensing for research in bio-physics, biology, and environmental sciences.

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High-sensitivity integrated devices based on surface plasmon resonance for sensing applications

Cited by 53 publications

References 49 publications

Narrow Absorption in ITO-Free Perovskite Solar Cells for Sensing Applications Analyzed through Electromagnetic Simulation

Narrow Absorption in ITO-Free Perovskite Solar Cells for Sensing Applications Analyzed through Electromagnetic Simulation

Significantly enhanced sensitivity using a gold aperture arrays-dielectric hybrid structure in optical fiber sensor

Opto-Electronic Refractometric Sensor Based on Surface Plasmon Resonances and the Bolometric Effect

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