Plasmon‐Resonance‐Enhanced Absorption and Circular Dichroism

Lieberman, Itai; Shemer, Gabriel; Fried, Tcipi; Kosower, Edward M.; Markovich, Gil

doi:10.1002/ange.200800231

Cited by 35 publications

(20 citation statements)

References 32 publications

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“…The latter lies ca. [12][13][14][15][16][17][18][19][20][21] This is typical of surface enhanced Raman or photopolymerization where the metallic structure acts to concentrate the electromagnetic field much like a lens focusing light. From the relative intensities of the dips at 525 nm (S 0 to j S 2 -SP > À ) and at 490 nm (S 0 to S 2 ), it is clear that not all the molecules are strongly coupled and that the S 0 to j S 2 -SP > À absorption coefficient (transition probability) is high.…”

Section: Methodsmentioning

confidence: 99%

Molecule–Light Complex: Dynamics of Hybrid Molecule–Surface Plasmon States

2009

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Section: Methodsmentioning

confidence: 99%

Molecule–Light Complex: Dynamics of Hybrid Molecule–Surface Plasmon States

2009

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“…Recently, colloidal AgNPs coated with GSH were used as electromagnetic antennae. [120] It was shown that the absorption and CD spectra of bimane, a chromophore, were enhanced when attached to NPs. The chromophore absorbs at the surface-plasmon-resonance wavelength of the AgNPs.…”

Section: Chiral Discriminationmentioning

confidence: 99%

Chiral Gold Nanoparticles

2009

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Monolayer-protected gold nanoparticles have many appealing physical and chemical properties such as quantum size effects, surface plasmon resonance, and catalytic activity. These hybrid organic-inorganic nanomaterials have promising potential applications as building blocks for nanotechnology, as catalysts, and as sensors. Recently, the chirality of these materials has attracted attention, and application to chiral technologies is an interesting perspective. This minireview deals with the preparation of chiral gold nanoparticles and their chiroptical properties. On the basis of the latter, together with predictions from quantum chemical calculations, we discuss different models that were put forward in the past to rationalize the observed optical activity in metal-based electronic transitions. We furthermore critically discuss these models in view of recent results on the structure determination of some gold clusters as well as ligand-exchange experiments examined by circular dichroism spectroscopy. It is also demonstrated that vibrational circular dichroism can be used to determine the structure of a chiral adsorbate and the way it interacts with the metal. Finally, possible applications of these new chiral materials are discussed.

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“…Research in this area is concentrated around spectroscopy of different plasmon modes7, appearance of hot spots, enhancement of different optical effects by plasmonic fields8, plasmon-to-heat conversion, and a variety of applications related to these effects9. Compared to the large progress in these areas, we are only beginning to understand a variety of chiral effects related to nanoscale plasmonic materials1011121314151617.…”

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confidence: 99%

“…Chirality of individual NPs can arise from electronic “imprints” of molecules on their surface1617. Different chirooptical effects for plasmonic materials could be unusually strong78111422 and enable several new photonics technologies11723. The fundamental studies and technology of chiral photonics depends on finding new preparative methods for chiral plasmonic enantiomers.…”

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confidence: 99%

Chiral plasmonics of self-assembled nanorod dimers

Kuang

Wang

et al. 2013

Sci Rep

200

233

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Chiral nanoscale photonic systems typically follow either tetrahedral or helical geometries that require four or more different constituent nanoparticles. Smaller number of particles and different chiral geometries taking advantage of the self-organization capabilities of nanomaterials will advance understanding of chiral plasmonic effects, facilitate development of their theory, and stimulate practical applications of chiroplasmonics. Here we show that gold nanorods self-assemble into side-by-side orientated pairs and “ladders” in which chiral properties originate from the small dihedral angle between them. Spontaneous twisting of one nanorod versus the other one breaks the centrosymmetric nature of the parallel assemblies. Two possible enantiomeric conformations with positive and negative dihedral angles were obtained with different assembly triggers. The chiral nature of the angled nanorod pairs was confirmed by 4π full space simulations and the first example of single-particle CD spectroscopy. Self-assembled nanorod pairs and “ladders” enable the development of chiral metamaterials, (bio)sensors, and new catalytic processes.

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Plasmon‐Resonance‐Enhanced Absorption and Circular Dichroism

Cited by 35 publications

References 32 publications

Molecule–Light Complex: Dynamics of Hybrid Molecule–Surface Plasmon States

Molecule–Light Complex: Dynamics of Hybrid Molecule–Surface Plasmon States

Chiral Gold Nanoparticles

Chiral plasmonics of self-assembled nanorod dimers

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