Reversible Plasmonic Circular Dichroism of Au Nanorod and DNA Assemblies

Li, Zhengtao; Zhu, Zhening; Liu, Wenjing; Zhou, Yunlong; Han, Bing; Gao, Yan; Tang, Zhiyong

doi:10.1021/ja209981n

Cited by 313 publications

(261 citation statements)

References 36 publications

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“…For example, it was a powerful method to differentiate a secondary structure of proteins which can appear in the forms of α-helix, random coil, or β-sheet. Recently the concepts of chirality and CD have been brought to the field of plasmonics [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] . One of the motivations for this development is plasmon-enhanced sensing of chiral molecules.…”

Section: Introductionmentioning

confidence: 99%

Giant circular dichroism of a molecule in a region of strong plasmon resonances between two neighboring gold nanocrystals

2013

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We report on giant circular dichroism (CD) of a molecule inserted into a plasmonic hot spot. Naturally occurring molecules and biomolecules have typically CD signals in the UV range, whereas plasmonic nanocrystals exhibit strong plasmon resonances in the visible spectral interval. Therefore, excitations of chiral molecules and plasmon resonances are typically off-resonant. Nevertheless, we demonstrate theoretically that it is possible to create strongly-enhanced molecular CD utilizing the plasmons. This task is doubly challenging since it requires both creation and enhancement of the molecular CD in the visible region. We demonstrate this effect within the model which incorporates a chiral molecule and a plasmonic dimer. The associated mechanism of plasmonic CD comes from the Coulomb interaction which is greatly amplified in a plasmonic hot spot. Important feature of the system is anisotropy that results in giant enhancement for the molecular dipoles parallel to the dimer axis. The proposed effect offers very interesting possibilities for enhanced sensing of chiral molecules using visible light.

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Section: Introductionmentioning

confidence: 99%

Giant circular dichroism of a molecule in a region of strong plasmon resonances between two neighboring gold nanocrystals

2013

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“…Plasmonic nanoarchitectures have been constructed by bottomup self-assembly and/or top-down lithography, showing a number of applications in diagnostics, energy-harvesting, nanophotonic circuits and so on [28]. Recent studies including our group's results have found that when chiral molecules or their assemblies are in proximity to noble metal nanoparticles, plasmon-induced CD in the visible or near-infrared region will appear owing to transportation of chirality from chiral molecules or templates to nanoparticles [29][30][31]. It should be noted that there have been some reports on the optical activity of gold or silver nanospheres or nanorods that are adsorbed on chiral molecular assemblies, such as DNA [32,33], peptides [34] or artificial chiral molecules [35].…”

Section: Resultsmentioning

confidence: 99%

Helical silver(I)-glutathione biocoordination polymer nanofibres

Liu

et al. 2013

Phil. Trans. R. Soc. A.

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Helical nanofibres of silver(I)-glutathione (Ag-GSH) biocoordination polymer (BCP) are fabricated by introducing dimethyl sulfoxide into the mixture solution of Ag + ions and l -GSH molecules. The prepared BCP nanofibres show hierarchical helical structures, which are constructed via twisting of small fibres. Water-soluble helices could be further cross-linked with Ca 2+ ions to form a well-dispersed aqueous suspension. When gold nanorods are adsorbed onto these helical nanofibres, the unique plasmon-induced circular dichroism characteristic is observed in the region of the local surface plasmon resonance of gold nanorods. This type of chiroptical metamaterials may have promising applications in nonlinear optics, negative refraction and biosensing.

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“…A biocompatible nanoplasmonic device was assembled with the aid of programmable DNA assembly [114], which can control the chirality of plasmonic nanostructures (Fig. 4) [115,116]. A 3D photonic crystal of DNA-labeled plasmonic nanoparticles was fabricated by DNA-programmable crystallization with nanometer precision [117].…”

Section: Plasmonic Devicesmentioning

confidence: 99%

Toward biomaterial-based implantable photonic devices

et al. 2017

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Optical technologies are essential for the rapid and efficient delivery of health care to patients. Efforts have begun to implement these technologies in miniature devices that are implantable in patients for continuous or chronic uses. In this review, we discuss guidelines for biomaterials suitable for use in vivo. Basic optical functions such as focusing, reflection, and diffraction have been realized with biopolymers. Biocompatible optical fibers can deliver sensing or therapeutic-inducing light into tissues and enable optical communications with implanted photonic devices. Wirelessly powered, light-emitting diodes (LEDs) and miniature lasers made of biocompatible materials may offer new approaches in optical sensing and therapy. Advances in biotechnologies, such as optogenetics, enable more sophisticated photonic devices with a high level of integration with neurological or physiological circuits. With further innovations and translational development, implantable photonic devices offer a pathway to improve health monitoring, diagnostics, and light-activated therapies.

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Reversible Plasmonic Circular Dichroism of Au Nanorod and DNA Assemblies

Cited by 313 publications

References 36 publications

Giant circular dichroism of a molecule in a region of strong plasmon resonances between two neighboring gold nanocrystals

Giant circular dichroism of a molecule in a region of strong plasmon resonances between two neighboring gold nanocrystals

Helical silver(I)-glutathione biocoordination polymer nanofibres

Toward biomaterial-based implantable photonic devices

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