Chiral Plasmonic Nanostructures on Achiral Nanopillars

Yeom, Bongjun; Zhang, Huanan; Zhang, Hui; Park, Jai Il; Kim, Kyoungwon; Govorov, Alexander O.; Kotov, Nicholas A.

doi:10.1021/nl402782d

Cited by 129 publications

(154 citation statements)

References 45 publications

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“…Optimized assemblies (Figures S8a,b), for which synthetic conditions were tuned to increase particle dimensions, have an absolute g-factor up to ~0.04 (Figure S8e), which, to our knowledge, is one of the highest reported to date for comparable nanoparticle assemblies. 9, 13, 14, 45 …”

Section: Resultsmentioning

confidence: 99%

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

et al. 2016

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Chiral nanoparticle assemblies are an interesting class of materials whose chiroptical properties make them attractive for a variety of applications. Here, C18-(PEPAuM-ox)2 (PEPAuM-ox = AYSSGAPPMoxPPF) is shown to direct the assembly of single-helical gold nanoparticle superstructures that exhibit exceptionally strong chiroptical activity at the plasmon frequency with absolute g-factor values up to 0.04. Transmission electron microscopy (TEM) and cryogenic electron tomography (cryo-ET) results indicate that the single helices have a periodic pitch of approximately 100 nm and consist of oblong gold nanoparticles. The morphology and assembled structure of C18-(PEPAuM-ox)2 are studied using TEM, atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, circular dichroism (CD) spectroscopy, X-ray diffraction (XRD), and solid-state nuclear magnetic resonance spectroscopy (ssNMR). TEM and AFM reveal that C18-(PEPAuM-ox)2 assembles into linear amyloid-like 1-D helical ribbons having structural parameters that correlate to those of the single-helical gold nanoparticle superstructures. FTIR, CD, XRD, and ssNMR indicate the presence of cross-β and polyproline II (PPII) secondary structure. A molecular assembly model is presented that takes into account all experimental observations and that supports the single-helical nanoparticle assembly architecture. This model provides the basis for the design of future nanoparticle assemblies having programmable structures and properties.

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Section: Resultsmentioning

confidence: 99%

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

et al. 2016

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“…Another related ansatz by Yeom et al . ( 33 ) used tilted evaporation of gold onto hexagonally shaped dielectric posts, leading to a handed metallic film on this platform, exhibiting a CD response in the visible wavelength region ( 34 ). Helgert et al .…”

Section: Top-down Fabrication Methods For Static Chiral Plasmonicsmentioning

confidence: 99%

Chiral plasmonics

et al. 2017

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“…As illustrated in Figure 3b, the coupling between charge carriers of achiral ZnO nanopillars and gold chiral shell resulted in chiral signal of achiral ZnO nanopillars. [78] The handedness of chiral gold nanocluster can be "transferred" to its adsorbate achiral molecule, and Figure 3c is the schematic of Au 38 (2PET) 24 nanocluster. [79] In this ensemble, the interaction between achiral molecules and chiral gold nanostructure broke the mirror symmetry, resulting in the chirality of molecules.…”

Section: Chiral Interactionsmentioning

confidence: 99%

Section: Quasi-2d Periodic Chiral Nanostructuresmentioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

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(circular birefringence) and absorption losses (circular dichroism) with the circu larly polarized light (CPL) illumination. [10] CB arises from the difference in the real part of refractive index, leading to a dif ferent velocity for LCP and RCP compo nents, and thus results in the polarization rotation of the linearly polarized incident light. CD corresponds to the difference in the imaginary part of refractive index, resulting in a distinct absorption loss for LCP and RCP excitations. Besides the con ventional CD and CB, asymmetric trans mission (circular conversion dichroism) is another fundamental chiroptical pheno menon, which exists in the nondiffracting array, referring to different LCPtoRCP and RCPtoLCP conversion efficiencies. [11] All of these chiroptical phenomena have been successfully applied in the spectros copy for identifying special arrangements of chiral matters in biology, chemistry and physics as efficient diagnostic tools. [12][13][14][15][16] However, the chirop tical response in natural chiral materials is relatively weak due to the small electromagnetic (EM) interaction volume, [17] hence limits its further applications.Recent progress in plasmonics paves the way for the enhancement of chiroptical response. [18][19][20] Surface plasmons (SPs), as the collective electrons oscillation at the dielectric and metal interface, [21][22][23] present the capacity of light confine ment and field enhancement, which significantly improve the strength of lightmatter interactions. [24][25][26][27][28] With the uptodate nanofabrication technology, the study field of chirality has been extended from traditional chiral molecules to 3D metallic nanostructures. [29][30][31][32] Chiroptical responses of metallic meta molecules have been widely investigated, [33][34][35] and applied in various fields, such as biosensing, [36] chiral catalysis, [37] polari zation tuning, [38] and chiral photo detection.[39] The 3D metallic structure exhibited giant optical activity response because of the strong interaction between electric and magnetic resonant modes. [40,41] Different from 3D chiral ensembles, planar chiral structures show none chiral effect, as they can always coincide with their mirror images. However, 2D chirality was successfully found in the quasitwodimensional (quasi2D) chiral structure. [42] Moreover, recent reports show that even achiral nanomaterials have the ability to generate strong CD under an oblique CPL illumination. [43] This kind of extrinsic chirality arises from sym metry breaking of the incident light and the quasi2D material, which is quite different from the intrinsic chirality of 3D chiral The plasmonic chiroptical effect has been used to manipulate chiral states of light, where the strong field enhancement and light localization in metallic nanostructures can amplify the chiroptical response. Moreover, in metamaterials, the chiroptical effect leads to circular dichroism (CD), circular birefringence (CB), and asymmetric transmission. Potential applications enabled by chiral plasmonics...

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Chiral Plasmonic Nanostructures on Achiral Nanopillars

Cited by 129 publications

References 45 publications

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

Chiral plasmonics

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

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