Optimal geometry for plasmonic sensing with non-interacting Au nanodisk arrays

Michieli, Niccolò; Balasa, Ionut Gabriel; Kalinic, Boris; Cesca, Tiziana; Mattei, Giovanni

doi:10.1039/d0na00208a

Cited by 8 publications

(4 citation statements)

References 59 publications

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“…In Figure 3 is shown a normalized variation of n 2 with no significant influence of multi-photonic absorption in the studied case for a population change in the excited nanoparticles by high irradiance in the three stage nanoparticles integrated by Pt, Ag and Au systems. Experimental verification of changes in nonlinear refractive index derived by the multi-metallic nanoparticles [26] or changes in ordered nanocomposites [27] have been previously reported and those findings are in good agreement with the results presented in this report.…”

Section: Resultssupporting

confidence: 92%

Cascade integration of nonlinear phenomena exhibited by monometallic nanoparticles

Estrada-León¹

2022

J. Phys.: Conf. Ser.

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In this work were numerically analyzed the third-order nonlinear optical effects exhibited by combinations of uncoupled monometallic silver, gold and platinum nanoparticles. The nanosystems were considered to be homogeneous and surrounded by a dielectric matrix. The design of the nanostructures was evaluated as a collective behavior resulting from the specific order of the set in trilayer tandem form. The characteristic Localized Surface Plasmon Resonance phenomena in the yellow, green and ultraviolet absorption bands for the Ag, Au and Pt; respectively, were considered. Different permutations of the three kind of monometallic elements selected in sequence were studied by using the wave equation and the finite difference method. Immediate indications useful for exploring nonlinear nanodevices and for building up nanostructured platforms based on nanoscale functions can be anticipated from this work.

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Section: Resultssupporting

confidence: 92%

Cascade integration of nonlinear phenomena exhibited by monometallic nanoparticles

Estrada-León¹

2022

J. Phys.: Conf. Ser.

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“…Translating into values of concentration and taking bovine serum albumin as an analyte, 1.3 mM aqueous solutions before and 1.4 mM aqueous solutions after polymer functionalization would be detectable. Although the obtained sensitivity is lower compared to optimized commercial systems, this material represents a promising starting point as an application of different colloidal metals − and as well different shapes ,, (Figure S14), together with ultrasensitive analytical methods, such as surface-enhanced Raman scattering (SERS), ,, will improve the sensitivity significantly. In addition, the mesoporous film provides a prefilter function (Figure S12) to increase selectivity and the local placement of responsive, ligand-binding polymers enables compartmentalization, allowing new sensing concepts for future applications, as the transport properties can be easily designed upon functionalization. − …”

Section: Resultsmentioning

confidence: 99%

Simultaneous Nanolocal Polymer and In Situ Readout Unit Placement in Mesoporous Separation Layers

et al. 2021

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Bioinspired solid-state nanopores and nanochannels have attracted interest in the last two decades, as they are envisioned to advance future sensing, energy conversion, and separation concepts. Although much effort has been made regarding functionalization of these materials, multifunctionality and accurate positioning of functionalities with nanoscale precision still remain challenging. However, this precision is necessary to meet transport performance and complexity of natural pores in living systems, which are often based on nonequilibrium states and compartmentalization. In this work, a nanolocal functionalization and simultaneous localized sensing strategy inside a filtering mesoporous film using precisely placed plasmonic metal nanoparticles inside mesoporous films with pore accessibility control is demonstrated. A single layer of gold nanoparticles is incorporated into mesoporous thin films with precise spatial control along the nanoscale layer thickness. The local surface plasmon resonance is applied to induce a photopolymerization leading to a nanoscopic polymer shell around the particles and thus nanolocal polymer placement inside the mesoporous material. As near-field modes are sensitive to the dielectric properties of their surrounding, the in situ sensing capability is demonstrated using UV–vis spectroscopy. It is demonstrated that the sensing sensitivity only slightly decreases upon functionalization. The presented nanolocal placement of responsive functional polymers into nanopores offers a simultaneous filtering and nanoscopic readout function. Such a nanoscale local control is envisioned to have a strong impact onto the development of new transport and sensor concepts, especially as the system can be developed into higher complexity using different metal nanoparticles and additional design of mesoporous film filtering properties.

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“…Overall, high-Q resonances are preferable for both spectral and intensity measurements, but should be engineered carefully considering the trade-off with other sensing performances. The abovementioned Si Huygens metasurfaces provide a comparable sensitivity and a higher FOM [28] than Au nanodisc arrays [24] (compared in tables 1, 2, and figure 2). But limited by the basic circular geometry, the Q factor predicted by standard Mie theory is still relatively low [34].…”

Section: Sensing Parametersmentioning

confidence: 98%

“…The increase of medium RI enhances the shielding effects on the electromagnetic coupling, which result in a larger spectral shift than isolated dielectric resonators [21]. In contrast, the coupling between plasmonic antennas is negligible, therefore the optimized BRIS remains at a similar level for single, ensemble Au nanodiscs [24], and ordered arrays (table 2).…”

Section: Mie Resonance For Refractometric Sensingmentioning

confidence: 99%

Dielectric metasurfaces for next-generation optical biosensing: a comparison with plasmonic sensing

2023

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In the past decades, nanophotonic biosensors have been extended from the extensively studied plasmonic platforms to dielectric metasurfaces. Instead of plasmonic resonance, dielectric metasurfaces are based on Mie resonance, which provide comparable sensitivity with superior resonance bandwidth, Q factor, and figure-of-merit. Although the plasmonic photothermal effect is beneficial in many biomedical applications, it is a fundamental limitation for biosensing. Dielectric metasurfaces solve the Ohmic loss and heating problems, providing better repeatability, stability, and bio-compatibility. We review the high-Q resonances based on various physical phenomena tailored by meta-atom geometric designs, and compare dielectric and plasmonic metasurfaces in refractometric, surface-enhanced, and chirality sensing for various biomedical and diagnostic applications. Departing from conventional spectral shift measurement using spectrometers, imaging-based and spectrometer-less biosensing are highlighted, including single-wavelength refractometric barcoding, surface-enhanced molecular fingerprinting, and integrated visual reporting. These unique modalities enabled by dielectric metasurfaces point to two important research directions. On the one hand, hyperspectral imaging provides massive information for smart data processing, which not only achieve better biomolecular sensing performance than conventional ensemble averaging, but also enable real-time monitoring of cellular or microbial behaviour in physiological conditions. On the other hand, a single metasurface can integrate both functions of sensing and optical output engineering, using single-wavelength or broadband light sources, which provides simple, fast, compact and cost-effective solutions. Finally, we provide perspectives in future development on metasurface materials, configurations, nanofabrication, surface modification and system integration, towards next-generation optical biosensing for ultra-sensitive, portable/wearable, lab-on-a-chip, point-of-care, multiplexed and scalable applications.

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Optimal geometry for plasmonic sensing with non-interacting Au nanodisk arrays

Abstract: Non-interacting, disordered plasmonic nanodisk arrays have competitive performances for local and bulk sensing and a large stability basin around the maximum sensitivities.

Cited by 8 publications

References 59 publications

Cascade integration of nonlinear phenomena exhibited by monometallic nanoparticles

Cascade integration of nonlinear phenomena exhibited by monometallic nanoparticles

Simultaneous Nanolocal Polymer and In Situ Readout Unit Placement in Mesoporous Separation Layers

Dielectric metasurfaces for next-generation optical biosensing: a comparison with plasmonic sensing

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