Circular Differential Two-Photon Luminescence from Helically Arranged Plasmonic Nanoparticles

Singh, Haobijam Johnson; Saumitra,; Singh, Vijay Raj; Sikdar, Sujit Kumar; Balaji, J.; Ghosh, Ambarish

doi:10.1021/acsphotonics.6b00087

Cited by 20 publications

(16 citation statements)

References 67 publications

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“…Embedding the QDs into the metamaterial host enhanced the TPL‐CD of the local QD emitters. The observation of TPL‐CD was also reported from silver nanoparticles arranged in a chiral fashion on a dielectric helical template . Third harmonic generation circular difference (THG‐CD) effects have recently been demonstrated in a chiral metamaterial covered with organic conjugated polymer (PFO) .…”

Section: Nonlinear Chiropticsmentioning

confidence: 77%

See 1 more Smart Citation

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: Nonlinear Chiropticsmentioning

confidence: 77%

“…It was found that the strength of the chiroptical interaction increases almost exponentially as the nanoparticles where brought closer together, which also caused a shift and a broadening of the CD spectrum. Two‐photon‐induced photo‐luminescence CD was also reported from this kind of systems …”

Section: Design Of Chiral Materialsmentioning

confidence: 80%

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

“…Nonlinear optical forms of response represent a further tier of opportunities. Distinctive features have relatively recently been shown to arise with two-photon absorption in experiments on a variety of chiral organic systems [109][110][111][112][113][114], for which the corresponding CD was first predicted by theory many years ago [115][116][117] and twophoton circular differential luminescence has indeed now been observed in helically arranged plasmonic nanoparticles [118]. As Friese leads the way in predicting a threephoton analogue of CD [119], it seems likely that proof of a CPL counterpart may also not be far away.…”

Section: Resultsmentioning

confidence: 99%

Chirality in fluorescence and energy transfer

Andrews

2019

Methods Appl. Fluoresc.

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Optical polarization features associated with the fundamental processes of molecular fluorescence and resonance energy transfer are in general studied with reference to plane polarizations. When any of the species involved is chiral, the associated emission processes may exhibit an element of circular polarizationa degree of optical helicity. Although usually a minor effect, some systems can exhibit a sizeable component of circularly polarized luminescence, whose helicity correlates with the enantiomeric form. In studies of multi-component systems, in which initial excitation of a donor speciesfollowed by energy transferleads to emission from an acceptor molecule, the handedness of both donor and acceptor may influence output circularity. In systems with an achiral acceptor, a degree of fluorescence circularity may be influenced by the handedness of a chiral donor, but this should not be construed in terms of 'conveying' chirality. Chiral molecules may also play a passive role by inducing helicity in the fluorescence from achiral neighbours, and further tiers of complexity arise if the initial excitation is itself of circular polarization. In all such processes, symmetry principles play a major role in determining a sensitivity to molecular handedness, and their detailed consideration enables a range of new experimental procedures to be identified. Casting the fundamental theory in terms of formal photon-molecule couplings enables the quantum mechanisms involved in all such phenomena to be clearly resolved. The results provide fresh physical insights, and establish connections across a range of indirectly related chiroptical phenomena including induced circular dichroism. Contents

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“…The potential of 3D‐resolved two‐photon‐actuated nanomedicine has been exploited via various nanomaterials such as semiconductor and carbon nanodots, polymeric, organic, silicon, gold, graphene and graphene oxide, silica hybrid, and other inorganic nanomaterials. What are the advantages of silica‐based nanoparticles?…”

Section: Two‐photon‐sensitive Organosilica Nanomaterialsmentioning

confidence: 99%

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

Croissant

Zink

Raehm

et al. 2018

Adv Healthcare Materials

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Coherent two-photon-excited (TPE) therapy in the near-infrared (NIR) provides safer cancer treatments than current therapies lacking spatial and temporal selectivities because it is characterized by a 3D spatial resolution of 1 µm and very low scattering. In this review, the principle of TPE and its significance in combination with organosilica nanoparticles (NPs) are introduced and then studies involving the design of pioneering TPE-NIR organosilica nanomaterials are discussed for bioimaging, drug delivery, and photodynamic therapy. Organosilica nanoparticles and their rich and well-established chemistry, tunable composition, porosity, size, and morphology provide ideal platforms for minimal side-effect therapies via TPE-NIR. Mesoporous silica and organosilica nanoparticles endowed with high surface areas can be functionalized to carry hydrophobic and biologically unstable two-photon absorbers for drug delivery and diagnosis. Currently, most light-actuated clinical therapeutic applications with NPs involve photodynamic therapy by singlet oxygen generation, but low photosensitizing efficiencies, tumor resistance, and lack of spatial resolution limit their applicability. On the contrary, higher photosensitizing yields, versatile therapies, and a unique spatial resolution are available with engineered two-photon-sensitive organosilica particles that selectively impact tumors while healthy tissues remain untouched. Patients suffering pathologies such as retinoblastoma, breast, and skin cancers will greatly benefit from TPE-NIR ultrasensitive diagnosis and therapy.

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Circular Differential Two-Photon Luminescence from Helically Arranged Plasmonic Nanoparticles

Cited by 20 publications

References 67 publications

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

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

Chirality in fluorescence and energy transfer

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

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