Mixing of quantum states: A new route to creating optical activity

Baimuratov, Anvar S.; Tepliakov, Nikita V.; Gun’ko, Yurii K.; Баранов, А. В.; Fedorov, Anatoly V.; Rukhlenko, Ivan D.

doi:10.1038/s41598-016-0017-0

Cited by 22 publications

(22 citation statements)

References 38 publications

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“…One can enhance the dissymmetry of the nanocrystal's interaction with circularly polarized light by optimizing the geometry of the nanocrystal. Indeed, if

#1D1B11 ⟨(⟨⟩,, boldn (||,, d) boldm)⟩ #1D1B11= #1D1B11\pm (⟨⟩,, (⟨⟩,, boldm (||,, μ) boldn))

for a certain intraband transition inside a nanocrystal, then the dissymmetry factor of this transition is maximal and equals ±2 . This means that the nanocrystal fully absorbs light of one circular polarization and is completely transparent for the light of the other.…”

Section: General Formalismmentioning

confidence: 99%

“…Indeed, if n d j jm h i h i¼AE m μ j jn h i h i for a certain intraband transition inside a nanocrystal, then the dissymmetry factor of this transition is maximal and equals AE2. 33 This means that the nanocrystal fully absorbs light of one circular polarization and is completely transparent for the light of the other. The nanocrystal parameters required for such a total dissymmetry of chiroptical response are determined by:…”

Section: General Formalismmentioning

confidence: 99%

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Intraband optical activity of semiconductor nanocrystals

et al. 2017

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Here we review our three recently developed analytical models describing the intraband optical activity of semiconductor nanocrystals, which is induced by screw dislocations, ionic impurities, or irregularities of the nanocrystal surface. The models predict that semiconductor nanocrystals can exhibit strong optical activity upon intraband transitions and have large dissymmetry of magnetic-dipole absorption. The developed models can be used to interpret experimental circular dichroism spectra of nanocrystals and to advance the existing techniques of enantioseparation, biosensing, and chiral chemistry.

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“…One can enhance the dissymmetry of the nanocrystal's interaction with circularly polarized light by optimizing the geometry of the nanocrystal. Indeed, if

#1D1B11 ⟨(⟨⟩,, boldn (||,, d) boldm)⟩ #1D1B11= #1D1B11\pm (⟨⟩,, (⟨⟩,, boldm (||,, μ) boldn))

Section: General Formalismmentioning

confidence: 99%

Section: General Formalismmentioning

confidence: 99%

Intraband optical activity of semiconductor nanocrystals

et al. 2017

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“…(v) Spontaneous chiral defects: NPs can be synthesized with spontaneous chiral surface and structural defects (e.g., screw dislocations [56,57] and dopant ions [58]) even without the presence of chiral ligands and can then be extracted from an achiral mixture by enantioselective phase transfer [40,59,60]. (vi) Ligand-induced chirality (LIC): optical activity may be induced in colloidal NPs through interaction of NPs with chiral ligands, such as cysteine or penicillamine [27,[61][62][63].…”

Section: Introductionmentioning

confidence: 99%

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

et al. 2020

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Chirality is one of the most fascinating occurrences in the natural world and plays a crucial role in chemistry, biochemistry, pharmacology, and medicine. Chirality has also been envisaged to play an important role in nanotechnology and particularly in nanophotonics, therefore, chiral and chiroptical active nanoparticles (NPs) have attracted a lot of interest over recent years. Optical activity can be induced in NPs in several different ways, including via the direct interaction of achiral NPs with a chiral molecule. This results in circular dichroism (CD) in the region of the intrinsic absorption of the NPs. This interaction in turn affects the optical properties of the chiral molecule. Recently, studies of induced chirality in quantum dots (QDs) has deserved special attention and this phenomenon has been explored in detail in a number of important papers. In this article, we review these important recent advances in the preparation and formation of chiral molecule–QD systems and analyze the mechanisms of induced chirality, the factors influencing CD spectra shape and the intensity of the CD, as well as the effect of QDs on chiral molecules. We also consider potential applications of these types of chiroptical QDs including sensing, bioimaging, enantioselective synthesis, circularly polarized light emitters, and spintronic devices. Finally, we highlight the problems and possibilities that can arise in research areas concerning the interaction of QDs with chiral molecules and that a mutual influence approach must be taken into account particularly in areas, such as photonics, cell imaging, pharmacology, nanomedicine and nanotoxicology.

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“…For example, light without a degree of handedness or helicity cannot produce any effect that leads to an enantiomeric excess (a difference in the number of right-and left-handed forms), or any response that differentiates between such individual forms, as will clearly emerge from the mathematics that follows. It is important not to underplay the strength of this condition [39], which is physically comprehensible as 'dressing' an achiral system with chiral light, as for example in induced circular dichroism [40,41]. However, when two or more chiral species are present, whose mutual interaction depends on their relative handedness even when no light is present [42], then light either with or without helical character can elicit a correspondingly differential response [43].…”

Section: Symmetry and Parity In Electrodynamicsmentioning

confidence: 99%

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

Andrews

2018

J. Opt.

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To properly represent the interplay and coupling of optical and material chirality at the photonmolecule or photon-nanoparticle level invites a recognition of quantum facets in the fundamental aspects and mechanisms of light-matter interaction. It is therefore appropriate to cast theory in a general quantum form, one that is applicable to both linear and nonlinear optics as well as various forms of chiroptical interaction including chiral optomechanics. Such a framework, fully accounting for both radiation and matter in quantum terms, facilitates the scrutiny and identification of key issues concerning spatial and temporal parity, scale, dissipation and measurement. Furthermore it fully provides for describing the interactions of structured or twisted light beams with a vortex character, and it leads to the complete identification of symmetry conditions for materials to provide for chiral discrimination. Quantum considerations also lend a distinctive perspective to the very different senses in which other aspects of chirality are recognized in metamaterials. Duly attending to the symmetry principles governing allowed or disallowed forms of chiral discrimination supports an objective appraisal of the experimental possibilities and developing applications.

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Mixing of quantum states: A new route to creating optical activity

Cited by 22 publications

References 38 publications

Intraband optical activity of semiconductor nanocrystals

Intraband optical activity of semiconductor nanocrystals

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

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