Gold Dimer Nanoantenna with Slanted Gap for Tunable LSPR and Improved SERS

Kessentini, Sameh; Barchiesi, Dominique; D’Andrea, Cristiano; Toma, Andréa; Guillot, Nicolas; Fabrizio, E. Di; Fazio, Barbara; Maragó, Onofrio M.; Gucciardi, P. G.; Chapelle, Marc L. Lamy De La

doi:10.1021/jp409844y

Cited by 98 publications

(72 citation statements)

References 75 publications

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“…For example, it has been demonstrated that dimers of gold nanorods with a slanted gap provides an improvement of the enhancement factor by 2 orders of magnitude compared to the rounded shape use in this paper. 79 Another example is given by the change of the adhesion layer (Cr or Ti) between the gold nanostructures and the dielectric substrate by an adhesion layer of (3-mercaptopropyl)-trimethoxysilane (MPTMS). In this case, the LSPR damping is decreased that induces an improvement of the SERS signal by a factor 10.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

High Sensitivity, High Selectivity SERS Detection of MnSOD Using Optical Nanoantennas Functionalized with Aptamers

et al. 2015

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In this paper, we present the development of a highly sensitive, specific and reproducible nanobiosensor to detect one specific liver cancer biomarker, the manganese super oxide dismutase (MnSOD). The high sensitivity and reproducibility was reached by using SERS on gold nanostructures (nanocylinders and coupled nanorods) produced by electron-beam lithography (EBL). The specificity of the detection was provided by the use of a specific aptamer with high affinity to the targeted protein as a recognition element. With such a sensor, we have been able to observe the SERS signal of the MnSOD at concentrations down to the nM level and to show with negative control that this detection is specific due to the use of the aptamer. This latter issue has allowed us to detect the MnSOD in different body fluids (serum and saliva) at concentrations in the nM range. We have then demonstrated the effectiveness of our SERS nanobiosensor using aptamer as a bioreceptor for the detection of disease biomarker at low concentration and in complex fluids.

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Section: ■ Results and Discussionmentioning

confidence: 99%

High Sensitivity, High Selectivity SERS Detection of MnSOD Using Optical Nanoantennas Functionalized with Aptamers

et al. 2015

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“…For the unenhanced measurement, the total volume within which the analyte molecules are Raman scattered can be compared to a cylinder shape with height = 16 / and diameter 26,29,30 = 4 / where f is the focal length of the pump laser beam and d is the diameter of the unfocused beam. From this volume, the concentration of 1mM and Avogadro's number it was easy to estimate the number of molecules from the unenhanced measurement to be 8.48 × 10 15 . For a concentration of 10 mM the surface density µ of BPE can be estimated to be 31 1 × 10 -12 mol·mm -2 .…”

Section: Sers Measurementsmentioning

confidence: 99%

“…Although gold nanoparticles have lower enhancement values when compared to silver they are less prone to oxidation and show considerable robustness for use in plasmonic sensing 14 . Coupled pairs of nanoparticles such as dipoles 15 and bowties 16 have been widely used due to the formation of highly localized near-field enhancement (so called "hot spots") in these structures as well as to the ability to tune their resonant wavelength to that of the incident Raman wavelength 17,18 . Periodic arrangements of these nanoparticle pairs have high reproducibility and structural reliability and possess very high enhancement values due to the conversion of the irradiating energy at these hot spots 19 .…”

Section: Introductionmentioning

confidence: 99%

Effect of periodicity in the optimization of fine tuned dipolar plasmonic structures for SERS

Vilhena¹,

McMeekin²,

Holmes-Smith³

et al. 2017

Third International Conference on Applications of Optics and Photonics

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Arrays of nanoantennas consisting of plasmonic dipole pairs have been widely used in surface-enhanced Raman spectroscopy (SERS). Fine-tuned structures that can efficiently convert incident electromagnetic energy to excite molecules and provide enhanced detection. However, this tuning mechanism also has its disadvantages. In order to prevent the cross coupling, the distance between each individual element must be increased. This leads to low packing density values which in turn results in a reduction of the overall enhanced Raman signal when these structures are compared to broadly tuned aggregates of particles such as those obtained through metal sputtering or colloidal deposition. In this work we demonstrate through simulations and experimental work that it is possible to increase the reflected signal of an array of nanoantennas by reducing the distance between them in the direction both perpendicular and parallel to the orientation of the incident electric field. It is shown the resonant wavelength shifts in two different spectral directions depending in how the intercell distance was reduced. These resultant shifts can reduce the tuning capabilities of the structures but also can increase the SERS intensity due to close coupling of the dipole pairs. We believe that these results will enable the design and fabrication of structures possessing a greater degree of tunability together with an overall enhanced Raman signal that can rival aggregated SERS substrates.

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“…11 Additionally, if the particle contains sharp tips, the lightning rod effect can occur. 5,11,12 The simplest model of a coupled plasmon system (nanoparticle aggregate) is a dimer in which two particles are closely packed. Understanding the mutual interaction between the aggregated nanoparticles is an up-to-date topic and the subject of much interest.…”

Section: Introductionmentioning

confidence: 99%

Interaction between Nanoprisms with Different Coupling Strength

et al. 2015

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The aggregated noble metal system, consisting of two or more nanoparticles, possesses unique optical properties. The most important is the ability to generate larger local electric field enhancement than a single particle. In this work, we have modeled the system composed of silver nanoprisms with different geometries. For this purpose, the optical properties of the single silver nanoprism and the aggregated nanoprism dimer with adjacent and coplanar bases configuration have been studied by the finite integration technique. The relationship between the geometrical parameters, in particular the radius of the edges of curvature of a single nanoprism, and the position of the extinction peak has been described in a form of a mathematical equation. By moving and rotating one of the nanoprisms relative to the other in the dimer system, the coupling strength between them has been investigated by analyzing the nearfield and far-field properties. On the basis of these results, a hybridization model of the nanoprism dimer has been proposed. Our theoretical considerations presented in this article can be a useful tool for predicting the optical properties of the organized metal nanoparticles and the optimization of the assembly process.

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Gold Dimer Nanoantenna with Slanted Gap for Tunable LSPR and Improved SERS

Cited by 98 publications

References 75 publications

High Sensitivity, High Selectivity SERS Detection of MnSOD Using Optical Nanoantennas Functionalized with Aptamers

High Sensitivity, High Selectivity SERS Detection of MnSOD Using Optical Nanoantennas Functionalized with Aptamers

Effect of periodicity in the optimization of fine tuned dipolar plasmonic structures for SERS

Interaction between Nanoprisms with Different Coupling Strength

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