Tuning the chiro-plasmonic response using high refractive index-dielectric templates

Nair, Greshma; Singh, Haobijam Johnson; Ghosh, Ambarish

doi:10.1039/c5tc00922g

Cited by 13 publications

(16 citation statements)

References 51 publications

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“…Experimentally, such helical assemblies were realized using dielectric scaffolds, such as twisted fibers and peptides . A different methods, using glancing angle deposition, was adapted by the Ghosh group …”

Section: Design Of Chiral Materialsmentioning

confidence: 99%

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Collins

Kuppe

Hooper

et al. 2017

Advanced Optical Materials

288

246

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Throughout the 19th and 20th century, chirality has mostly been associated with chemistry. However, while chirality can be very useful for understanding molecules, molecules are not well suited for understanding chirality. Indeed, the size of atoms, the length of molecular bonds and the orientations of orbitals cannot be varied at will. It is therefore difficult to study the emergence and evolution of chirality in molecules, as a function of geometrical parameters. By contrast, chiral metal nanostructures offer an unprecedented flexibility of design. Modern nanofabrication allows chiral metal nanoparticles to tune the geometric and optical chirality parameters, which are key for properties such as negative refractive index and superchiral light. Chiral meta/nano‐materials are promising for numerous technological applications, such as chiral molecular sensing, separation and synthesis, super‐resolution imaging, nanorobotics, and ultra‐thin broadband optical components for chiral light. This review covers some of the fundamentals and highlights recent trends. We begin by discussing linear chiroptical effects. We then survey the design of modern chiral materials. Next, the emergence and use of chirality parameters are summarized. In the following part, we cover the properties of nonlinear chiroptical materials. Finally, in the conclusion section, we point out current limitations and future directions of development.

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Section: Design Of Chiral Materialsmentioning

confidence: 99%

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Collins

Kuppe

Hooper

et al. 2017

Advanced Optical Materials

288

246

View full text Add to dashboard Cite

show abstract

“…A key advantage of this technique is the possibility of having a (one-photon) chiro-optical response in the visible regime, due to the small size of the metal NPs, as opposed to chiral nanostructures made of metallic materials. Also, this technique allowed high flexibility in tuning the spectral positions of the chiro-optical response, through simple annealing or varying the underlying dielectric material of the helix. In Figure B, we show the measured circular dichroism, defined as the difference in absorption for normally incident left ( A L ) and right ( A R ) circularly polarized (CP) light, given by CD , = A L – A R ≈ 2( I L – I R )/( I L + I R ).…”

Section: Resultsmentioning

confidence: 99%

Circular Differential Two-Photon Luminescence from Helically Arranged Plasmonic Nanoparticles

et al. 2016

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We report the observation of a circular differential two-photon photoluminescence (TPPL) response from a three-dimensional chiral metamaterial, comprising a system of achiral (spherical) metal nanoparticles arranged on a chiral (helical) dielectric template. The enhanced dipolar response of the individual particles arising from their strong electromagnetic coupling resulted in strong photoluminescence under peak illumination intensities as low as 2 × 103 W/cm2. The TPPL signal was of approximately equal magnitude but of opposite sign, which depended on both the circular polarization state of the incident beam and the handedness of the helical geometry. The strong chiro-optical effect observed in these experiments may be relevant to technologies related to nonlinear plasmonics, in particular imaging applications where control over the polarization state of the imaged photons may be desirable.

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“…The tailoring of chiro-optical response down to optical frequencies was achieved by chiral arrangement of plasmonic objects, usually nanospheres, analytically [86][87][88] proposed and experimentally realized, employing metal decorated helical scaffolds obtained by self-assembly of gold nanorods on a fiber backbone [31,[89][90][91][92] or peptide nanotubes [93] and exhibiting strong chiro-optical properties in the visible.…”

Section: Optical Activity Of Nanohelices By Dna Templatingmentioning

confidence: 99%

Materials and 3D Designs of Helix Nanostructures for Chirality at Optical Frequencies

Passaseo

Esposito

Cuscunà

et al. 2017

Advanced Optical Materials

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The capability to fully control the chiro‐optical properties of metamaterials has drawn considerable attention due to developments in metamaterial fabrication techniques and a deeper understanding of the light–matter interaction, enabling a number of applications from integrated photonics to life sciences. From simple geometrical studies on single helix shaped metamaterials, both the design complexity and nanofabrication capability are steadily increasing allowing to extend their properties to the visible regime and beyond. In this work, helix‐shaped micro‐ and nanostructures are reviewed, which have the possibility to modulate their optical response in the linear regime at optical frequencies by spatial arrangement or by constitutive material. An overview of different theories describing the general optical operation of chiral media and a discussion on experimental results obtained by the state‐of‐the‐art helix structures realized by different fabrication techniques is provided. Finally, advanced designs for improved functionality envisaged to match practical applications or to enable new optical multifunctionalities are compared. Even if many applications have been envisaged only theoretically, the continuous effort and progress shown by the research community engaged in this field suggests that helical chiral metamaterials could represent a disruptive breakthrough for advanced optical devices.

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Tuning the chiro-plasmonic response using high refractive index-dielectric templates

Cited by 13 publications

References 51 publications

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Circular Differential Two-Photon Luminescence from Helically Arranged Plasmonic Nanoparticles

Materials and 3D Designs of Helix Nanostructures for Chirality at Optical Frequencies

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