Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Paiva-Marques, Willian A.; Gómez, Faustino Reyes; Oliveira, Osvaldo N.; Mejía‐Salazar, J. R.

doi:10.3390/s20030944

Cited by 36 publications

(32 citation statements)

References 131 publications

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“…To date, efforts have focused on exploiting either metallic 21 − 23 or dielectric particles, 16 , 24 , 25 for which the magnetic or electric field enhancement is comparatively weak. Metallic nanostructures can create intense electric dipole fields thanks to localized surface plasmons.…”

Section: Introductionmentioning

confidence: 99%

Dual Nanoresonators for Ultrasensitive Chiral Detection

et al. 2021

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The discrimination of enantiomers is crucial in biochemistry. However, chiral sensing faces significant limitations due to inherently weak chiroptical signals. Nanophotonics is a promising solution to enhance sensitivity thanks to increased optical chirality maximized by strong electric and magnetic fields. Metallic and dielectric nanoparticles can separately provide electric and magnetic resonances. Here we propose their synergistic combination in hybrid metal–dielectric nanostructures to exploit their dual character for superchiral fields beyond the limits of single particles. For optimal optical chirality, in addition to maximization of the resonance strength, the resonances must spectrally coincide. Simultaneously, their electric and magnetic fields must be parallel and π/2 out of phase and spatially overlap. We demonstrate that the interplay between the strength of the resonances and these optimal conditions constrains the attainable optical chirality in resonant systems. Starting from a simple symmetric nanodimer, we derive closed-form expressions elucidating its fundamental limits of optical chirality. Building on the trade-offs of different classes of dimers, we then suggest an asymmetric dual dimer based on realistic materials. These dual nanoresonators provide strong and decoupled electric and magnetic resonances together with optimal conditions for chiral fields. Finally, we introduce more complex dual building blocks for a metasurface with a record 300-fold enhancement of local optical chirality in nanoscale gaps, enabling circular dichroism enhancement by a factor of 20. By combining analytical insight and practical designs, our results put forward hybrid resonators to increase chiral sensitivity, particularly for small molecular quantities.

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Section: Introductionmentioning

confidence: 99%

Dual Nanoresonators for Ultrasensitive Chiral Detection

et al. 2021

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“…In this system, the output signal can be modulated/switched through the polarization angle of the input signals in port1 (1 in figure), port2 (2 in figure), or both. Chiral plasmonic structures [200], i.e., plasmonics systems whose opposite mirror images cannot be superimposed through symmetry operations, can also be used for routing of circularly polarized light (CPL) [201]. Figure 4f shows a SEM micrograph of a two-dimensional gold nanostructure used for polarization-based routing of the incident CPL.…”

Section: Plasmonic Filters Switches Routers and Photodetectorsmentioning

confidence: 99%

Plasmonics for Telecommunications Applications

Carvalho

Mejía‐Salazar

2020

Sensors

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Plasmonic materials, when properly illuminated with visible or near-infrared wavelengths, exhibit unique and interesting features that can be exploited for tailoring and tuning the light radiation and propagation properties at nanoscale dimensions. A variety of plasmonic heterostructures have been demonstrated for optical-signal filtering, transmission, detection, transportation, and modulation. In this review, state-of-the-art plasmonic structures used for telecommunications applications are summarized. In doing so, we discuss their distinctive roles on multiple approaches including beam steering, guiding, filtering, modulation, switching, and detection, which are all of prime importance for the development of the sixth generation (6G) cellular networks.

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“…Many new synthetically produced chiral materials have been introduced recently including: metal nanoparticles (NPs) and surfaces, colloidal semiconductor nanocrystals (NCs) and nanoceramics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The area of chiral nanomaterials research is rapidly expanding, due to the numerous potential applications, including asymmetric catalysis [18][19][20], enantiomeric separation [21,22], chiral sensing [3,[23][24][25], cytotoxicity mediation [26], circular polarized light emitting devices [27][28][29] and spintronics [30,31].…”

Section: Introductionmentioning

confidence: 99%

“…A number of reviews on chiral NPs have been published [2][3][4][5][6][7][8][9][10][11][12][14][15][16][17]. These reviews have covered a wide range of chiral NPs of various nature with particular attention paid to chiral plasmonics.…”

Section: Introductionmentioning

confidence: 99%

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

et al. 2020

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Chirality is one of the most fascinating occurrences in the natural world and plays a crucial role in chemistry, biochemistry, pharmacology, and medicine. Chirality has also been envisaged to play an important role in nanotechnology and particularly in nanophotonics, therefore, chiral and chiroptical active nanoparticles (NPs) have attracted a lot of interest over recent years. Optical activity can be induced in NPs in several different ways, including via the direct interaction of achiral NPs with a chiral molecule. This results in circular dichroism (CD) in the region of the intrinsic absorption of the NPs. This interaction in turn affects the optical properties of the chiral molecule. Recently, studies of induced chirality in quantum dots (QDs) has deserved special attention and this phenomenon has been explored in detail in a number of important papers. In this article, we review these important recent advances in the preparation and formation of chiral molecule–QD systems and analyze the mechanisms of induced chirality, the factors influencing CD spectra shape and the intensity of the CD, as well as the effect of QDs on chiral molecules. We also consider potential applications of these types of chiroptical QDs including sensing, bioimaging, enantioselective synthesis, circularly polarized light emitters, and spintronic devices. Finally, we highlight the problems and possibilities that can arise in research areas concerning the interaction of QDs with chiral molecules and that a mutual influence approach must be taken into account particularly in areas, such as photonics, cell imaging, pharmacology, nanomedicine and nanotoxicology.

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Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Cited by 36 publications

References 131 publications

Dual Nanoresonators for Ultrasensitive Chiral Detection

Dual Nanoresonators for Ultrasensitive Chiral Detection

Plasmonics for Telecommunications Applications

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

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