Recent Advances in Plasmonic Sensor-Based Fiber Optic Probes for Biological Applications

Gandhi, M. S. Aruna; Chu, Suoda; Senthilnathan, K.; Babu, P. Ramesh; Nakkeeran, K.; Li, Qian

doi:10.3390/app9050949

Cited by 120 publications

(66 citation statements)

References 143 publications

(160 reference statements)

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“…Further, it is also clear that the thinner analyte binding layer has a better linearity than the one with thicker binding layer. Using the sensitivity (S) value and the FWHM bandwidths data, we can calculate the figure of merit (FOM) [36] From Fig. 12(e), it should be noted that the corresponding FOM of the sensor will be degraded sharply as the FWHM bandwidth is broadened due to the the secondary resonance at the longer wavelength.…”

Section: Sensing Performancementioning

confidence: 99%

Influence of the Sub-Peak of Secondary Surface Plasmon Resonance Onto the Sensing Performance of a D-Shaped Photonic Crystal Fibre Sensor

Chu

Nakkeeran

Abobaker³

et al. 2021

IEEE Sensors J.

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In this paper, we design a 6-fold D-shaped photonic crystal fibre sensor based on the surface plasmon resonance (SPR). The coupling between fundamental core mode and three surface plasmonic modes which have different electric filed distributions for analytes of various refractive indices. We observe two different types of SPRs, namely, 'dielectric like' resonance with low-loss peak and 'plasmon like' resonance with high-loss peak, by analyzing the electric field distribution of the fibre modes. Further, we discuss the influence of the secondary SPR over the main SPR which is directly related to the detection performance of the proposed sensor. In order to mitigate the adverse effect of the sub-peak of the secondary SPR on the sensor's dynamic sensing range (DSR), we reduce the thickness of analyte's binding layer from 1500 nm to 500 nm. Thus, DSR can be extended to 44.4% from 1.33-1.41 to 1.33-1.45 at the cost of a reduced maximum sensitivity from 7900 nm/RIU to 5300 nm/RIU. Owning to the simple structure design of the proposed sensor, we envisage that this highly sensitive D-shaped PCF-SPR sensor could be developed as a versatile and competitive instrument with a large and flexible refractive index detection range.

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Section: Sensing Performancementioning

confidence: 99%

Influence of the Sub-Peak of Secondary Surface Plasmon Resonance Onto the Sensing Performance of a D-Shaped Photonic Crystal Fibre Sensor

Chu

Nakkeeran

Abobaker³

et al. 2021

IEEE Sensors J.

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“…The surface plasmon resonance (SPR) phenomenon has been widely studied and applied in medical diagnostics, environmental monitoring, and biochemical research due to its high sensitivity, real-time and label-free monitoring [1][2][3][4][5][6]. Most commercial SPR sensors are based on a prism structure.…”

Section: Introductionmentioning

confidence: 99%

“…Using optical fiber-based SPR instead of a bulky prism can improve the integration degree. In these fiber-based designs, the fiber jacket is physically or chemically removed to expose the core to the sensing region in order to enhance the coupling between the core mode and the surface plasmon polariton (SPP) modes [1][2][3][4][5][6]. The laborious process will make the sensor more fragile.…”

Section: Introductionmentioning

confidence: 99%

A Large Detection-Range Plasmonic Sensor Based on An H-Shaped Photonic Crystal Fiber

Han

Hou

Zhao

et al. 2020

Sensors

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An H-shaped photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor is proposed for detecting large refractive index (RI) range which can either be higher or lower than the RI of the fiber material used. The grooves of the H-shaped PCF as the sensing channels are coated with gold film and then brought into direct contact with the analyte, which not only reduces the complexity of the fabrication but also provides reusable capacity compared with other designs. The sensing performance of the proposed sensor is investigated by using the finite element method. Numerical results show that the sensor can work normally in the large analyte RI (n a ) range from 1.33 to 1.49, and reach the maximum sensitivity of 25,900 nm/RIU (RI units) at the n a range 1.47-1.48. Moreover, the sensor shows good stability in the tolerances of ±10% of the gold-film thickness.

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“…From plasmonic resonators [24][25][26] to periodic lattices [27][28][29], myriad combinations of materials and geometries can be used to manipulate electromagnetic characteristics (enhancing interactions with matter [30][31][32][33][34][35]) in extraordinary ways, but net effects are often similar [36,37]. The wave nature of Maxwell's equations and nonconvexity of electromagnetic optimizations with respect to material susceptibility makes discerning optimal solutions challenging [38][39][40], often leading to the consideration of designs that are sensitive to minute structural alterations [41,42]. In most situations of practical interest, quantitative relations between basic design characteristics (like available volume and material response) and achievable performance are not known.…”

Section: Introductionmentioning

confidence: 99%

GlobalToperator bounds on electromagnetic scattering: Upper bounds on far-field cross sections

Molesky

Chao

Rodríguez

2020

Phys. Rev. Research

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We present a method based on the scattering T operator, and conservation of net real and reactive power, to provide physical bounds on any electromagnetic design objective that can be framed as a net radiative emission, scattering or absorption process. Application of this approach to plane-wave scattering from an arbitrarily shaped, compact body of homogeneous electric susceptibility χ is found to predictively quantify and differentiate the relative performance of dielectric and metallic materials across all optical length scales. When the size of a device is restricted to be much smaller than the wavelength (a subwavelength cavity, antenna, nanoparticle, etc.), the maximum cross-section enhancement that may be achieved via material structuring is found to be much weaker than prior predictions: the response of strong metals (Re [χ ] 0) exhibits a diluted (homogenized) effective medium scaling ∝|χ |/ Im [χ ]; below a threshold size inversely proportional to the index of refraction (consistent with the half-wavelength resonance condition), the maximum cross-section enhancement possible with dielectrics (Re [χ ] > 0) shows the same material dependence as Rayleigh scattering. In the limit of a bounding volume much larger than the wavelength in all dimensions, achievable scattering interactions asymptote to the geometric area, as predicted by ray optics. For representative metal and dielectric materials, geometries capable of scattering power from an incident plane wave within an order of magnitude (typically a factor of two) of the bound are discovered by inverse design. The basis of the method rests entirely on scattering theory and can thus likely be applied to acoustics, quantum mechanics, and other wave physics.

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Recent Advances in Plasmonic Sensor-Based Fiber Optic Probes for Biological Applications

Cited by 120 publications

References 143 publications

Influence of the Sub-Peak of Secondary Surface Plasmon Resonance Onto the Sensing Performance of a D-Shaped Photonic Crystal Fibre Sensor

Influence of the Sub-Peak of Secondary Surface Plasmon Resonance Onto the Sensing Performance of a D-Shaped Photonic Crystal Fibre Sensor

A Large Detection-Range Plasmonic Sensor Based on An H-Shaped Photonic Crystal Fiber

GlobalToperator bounds on electromagnetic scattering: Upper bounds on far-field cross sections

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