Chiroptical hot spots in twisted nanowire plasmonic oscillators

Tang, Yiqiao; Sun, Lishan; Cohen, Adam E.

doi:10.1063/1.4789529

Cited by 29 publications

(33 citation statements)

References 18 publications

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“…As a strategy for selective growth of crystals with certain chirality, enantioselective interactions between molecules and crystals have been exploited. Ben-Moshe et al synthesized chirality-selected nanocrystals of cinnabar (mercury sulfide, α-HgS, space group P3 1 21 and P3 2 21) crystals in the presence of chiral penicillamine molecules. [211] In a following paper, the evolution of 3D chiral morphology was demonstrated with α-HgS as well as selenium (Se) and tellurium (Te) nanocrystals, which have the same space groups as α-HgS.…”

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

“…[8][9][10][11][12][13] Amino acids and sugars are the smallest chiral building blocks of life, of electromagnetic fields near the chiral plasmonic nanostructures not only enhance the sensitivity of chiroptical measurement down to a monolayer level of molecules, but also generate giant chiroptical responses itself. [19][20][21][22][23][24][25] Beyond the detection of molecular chirality, chiral inorganic nanostructures provide a lot of new opportunities to control chirality of light and spinrelated phenomena. Polarization-selective amplitude and phase change of light in engineered chiral building blocks have been a core technology for nanometer-thin flat metalens, [26,27] chiral photodetector, [28] and 3D holographic display.…”

Section: Introductionmentioning

confidence: 99%

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Chiral Surface and Geometry of Metal Nanocrystals

et al. 2019

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and their microscopic assembling and folding gradually give rise to chirality and left-right asymmetry from supramolecules to organelles, cells, and macroscopic organisms. Although the origin of homochirality is still unexplained and opens to arguments, investigating the chirality of matter and its origination is a central part of understanding asymmetric physical and chemical phenomena. The importance of chirality in chemistry lies in the asymmetric biochemical reactions with different physiological effect, which has paramount importance in biochemistry and pharmaceutical industry. [3,14,15] A mirror image of chiral objects can be determined into one of the left-handed or right-handed forms of geometry, called enantiomer or enantiomorph. Both enantiomers of a chiral object consist of identical chemical compositions but indeed are significantly different in their light-matter interaction, catalysis, and biological functions. The enantioselective signaling and enzymatic reaction are attributed to the homochirality of the living organism and its biological receptors, which are only composed of l-form amino acids and d-form sugars in nature. [7,14,15] Thalidomide is often referred to as a representative but also the most tragic example. The R-form of this drug is harmless to the body and was released as a painkiller for pregnant women, but its enantiomer causes severe malformation in the limbs of infants. [15,16] Since then, it has been a requirement for drugs to be characterized as a single enantiomer to be approved. 3D chirality is a unique characteristic of life, and the stereochemical aspect of molecular materials has come to fore of modern chemistry and biology. The optical property of chiral compounds, the so-called chiroptical effect, is highly effective for observing chirality in a nondestructive manner. [17] Chiroptical effects can be used for determination of the absolute configuration and enantiomeric excess of chiral molecules and as an optical probe for estimating the 3D structure of biomacromolecules such as proteins and DNA. [18] However, in most chiral organic molecules and biomolecules, chiroptical effects are typically very weak due to the much smaller size of molecules than the wavelength of exciting light. Integration of inorganic nanomaterials is one promising method for increasing the chiroptical signal of molecules; it focuses the light into nanoscale area to maximize the lightmatter interaction. [19-22] For example, a complex spatial profile Chirality is a basic property of nature and has great importance in photonics, biochemistry, medicine, and catalysis. This importance has led to the emergence of the chiral inorganic nanostructure field in the last two decades, providing opportunities to control the chirality of light and biochemical reactions. While the facile production of 3D nanostructures has remained a major challenge, recent advances in nanocrystal synthesis have provided a new pathway for efficient control of chirality at the nanoscale by transferring molecular chirality to the geo...

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Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chiral Surface and Geometry of Metal Nanocrystals

et al. 2019

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“…These effects, which may be useful for biomolecular sensing 9,12 and are fundamentally interesting, are nevertheless limited in magnitude. Stronger effects could be obtained in systems of achiral nanoparticles arranged in a chiral superstructure with strong interparticle interaction [13][14][15][16] . Recently, Kotov and colleagues 17 demonstrated that the chiroptical activity of a chiral particle dimer is intense enough to monitor on a single nanoparticle level.…”

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confidence: 99%

Enantioselective control of lattice and shape chirality in inorganic nanostructures using chiral biomolecules

et al. 2014

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A large number of inorganic materials form crystals with chiral symmetry groups. Enantioselectively synthesizing nanostructures of such materials should lead to interesting optical activity effects. Here we report the synthesis of colloidal tellurium and selenium nanostructures using thiolated chiral biomolecules. The synthesis conditions are tuned to obtain tellurium nanostructures with chiral shapes and large optical activity. These nanostructures exhibit visible optical and chiroptical responses that shift with size and are successfully simulated by an electromagnetic model. The model shows that they behave as chiral optical resonators. The chiral tellurium nanostructures are transformed into chiral gold and silver telluride nanostructures with very large chiroptical activity, demonstrating a simple colloidal chemistry path to chiral plasmonic and semiconductor metamaterials. These materials are natural candidates for studies related to interactions of chiral (bio)molecules with chiral inorganic surfaces, with relevance to asymmetric catalysis, chiral crystallization and the evolution of homochirality in biomolecules.

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“…For instance, the sample of natural chiral structure leads to the CD signal, such as spiral and helix [12,13]. Another typically type of chiral structure is bilayer twisted nanostructures, where there magnetic and electric resonances arise at the same time, which have giant CD [14,15]. Furthermore, plane chiral asymmetric structures, such as swastika [16,17], asymmetric slit [18] and other chiral structures that have perceived vision of "twist" [19].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic circular dichroism of a tailed spatial cross-shaped nanostructure

Wang

et al. 2018

J. Opt. Technol.

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Artificial chiral plasmonic nanostructure with strong circular dichroism (CD) has wide applications in biological monitoring, analytic chemistry, and optical property researching. In this paper, a tail is introduced to break the symmetry of metal spatial cross-shaped nanostructure to create chiral property. Finite element method calculating results show that dipole of upper tailed nanorod and that of bottom nanorod form Born-Kuhn model. CD effect depends strongly on the length and the orientation of introduced nanorod. This work provides novel way to generate tunable CD effect and provides potential application for further optimization.

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Chiroptical hot spots in twisted nanowire plasmonic oscillators

Cited by 29 publications

References 18 publications

Chiral Surface and Geometry of Metal Nanocrystals

Chiral Surface and Geometry of Metal Nanocrystals

Enantioselective control of lattice and shape chirality in inorganic nanostructures using chiral biomolecules

Plasmonic circular dichroism of a tailed spatial cross-shaped nanostructure

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