Experimental and theoretical investigation of the co-occurrence of linear and circular dichroisms for oblique incidence of light on chiral sculptured thin films

McAtee, Patrick D.; Lakhtakia, Akhlesh

doi:10.1364/josaa.35.001131

Cited by 6 publications

(5 citation statements)

References 45 publications

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“…In general, chiroptical mechanisms interlace the chirality of molecules with the helicity of light associated with polarization, to exhibit process rates and forces that are sensitive to changes of either optical or material handedness in the total system [3]. Classic examples include circular dichroism [4], differential Rayleigh and Raman scattering [5], resonance energy transfer and discriminatory dispersion interactions [6,7], and optical trapping and binding forces [8,9]. The latter examples are relatively recent discoveries, which show a propensity for the optical separation of enantiomers and identification of the actual existence of chirality in a system [10].…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit interactions and chiroptical effects engaging orbital angular momentum of twisted light in chiral and achiral media

Forbes

Andrews

2019

Phys. Rev. A

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There is recurrent interest in the orbital angular momentum (OAM) conveyed by optical vortices, which are structured beams with a helically twisted wavefront. Particular significance is attached to the issue of how, in its interactions with matter, light conveying OAM might prove sensitive to the relative handedness and degree of twist in the associated optical wavefront. As a result of recent experimental and theoretical studies, the supposition that beams with OAM might enable discrimination between oppositely handed forms of matter has become a renewed focus of attention. Some of the tantalizing conclusions that are beginning to emerge from this research have, however, not yet established a definitive basis for a supporting mechanism. To resolve this problem requires the development of theory to support a faithful representation, and a thorough understanding, of the fundamental molecule-photon physics at play in such optical processeseven for processes as basic as absorption. The present analysis establishes mechanisms at play that entail a novel manifestation of optical spin-orbit interactions (SOI), engaging transition electric quadrupole moments. Moreover, powerful symmetry principles prove to render distinctively different criteria governing the exhibition of 2D and 3D chirality. The new results elucidate the operation of such effects, identifying their responsibility for discriminatory optical interactions of various forms in both chiral and achiral media.

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Section: Introductionmentioning

confidence: 99%

Spin-orbit interactions and chiroptical effects engaging orbital angular momentum of twisted light in chiral and achiral media

Forbes

Andrews

2019

Phys. Rev. A

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“…is a measure of the circular-polarization-state-dependence of transmission. 16 Whereas CD app may not equal zero for a non-dissipative disordered chiral structure, CD tru must.…”

Section: Circular and Linear Dichroismsmentioning

confidence: 99%

“…15,18 Of course, CD tru = 0 and LD tru = 0 because Structure I-R is non-dissipative. 15,16 Finally, Φ R ≡ 0 because ϵ(z) does not depend on x and y. Figure 2.…”

Section: Ordered Chiral Structuresmentioning

confidence: 99%

Disordered chiral structures

Lakhtakia

2024

Bioinspiration, Biomimetics, and Bioreplication XIV

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Inspired by the morphological disorder that underlies the exhibition of circular-polarization-state-sensitive color by the exocuticle in many beetle species, the concept of disordered chirality was theoretically explored. The disordered chiral structure chosen is one wherein each helical turn may be different from its adjacent helical turns. The boundary-value problem of reflection and transmission of a normally incident plane wave by a disordered chiral structure was solved. Numerical results indicate the remarkable resilience of circular-polarization-stateselective reflection.

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“…However, applications of the symmetry framework to be developed in the following analysis do invite extension to nanofabricated dielectric structures, where transition processes such as circular dichroism occur, even as specifically quantum aspects of the radiation become less prominent. An example of recent work in this area is a fine combination of theory and experimental work on dichroism in chiral sculptured thin films [59].…”

Section: Symmetry Principles For Photon-molecule Interactionsmentioning

confidence: 99%

Symmetries, Conserved Properties, Tensor Representations, and Irreducible Forms in Molecular Quantum Electrodynamics

Andrews

2018

Symmetry

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In the wide realm of applications of quantum electrodynamics, a non-covariant formulation of theory is particularly well suited to describing the interactions of light with molecular matter. The robust framework upon which this formulation is built, fully accounting for the intrinsically quantum nature of both light and the molecular states, enables powerful symmetry principles to be applied. With their origins in the fundamental transformation properties of the electromagnetic field, the application of these principles can readily resolve issues concerning the validity of mechanisms, as well as facilitate the identification of conditions for widely ranging forms of linear and nonlinear optics. Considerations of temporal, structural, and tensorial symmetry offer significant additional advantages in correctly registering chiral forms of interaction. More generally, the implementation of symmetry principles can considerably simplify analysis by reducing the number of independent quantities necessary to relate to experimental results to a minimum. In this account, a variety of such principles are drawn out with reference to applications, including recent advances. Connections are established with parity, duality, angular momentum, continuity equations, conservation laws, chirality, and spectroscopic selection rules. Particular attention is paid to the optical interactions of molecules as they are commonly studied, in fluids and randomly organised media.

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Experimental and theoretical investigation of the co-occurrence of linear and circular dichroisms for oblique incidence of light on chiral sculptured thin films

Cited by 6 publications

References 45 publications

Spin-orbit interactions and chiroptical effects engaging orbital angular momentum of twisted light in chiral and achiral media

Spin-orbit interactions and chiroptical effects engaging orbital angular momentum of twisted light in chiral and achiral media

Disordered chiral structures

Symmetries, Conserved Properties, Tensor Representations, and Irreducible Forms in Molecular Quantum Electrodynamics

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