Surface-Enhanced Circular Dichroism spectroscopy on periodic dual nanostructures

Lasa-Alonso, Jon; Abujetas, Diego R.; Nodar, Álvaro; Dionne, Jennifer A.; Sáenz, Juan José; Molina-Terriza, Gabriel; Aizpurua, Javier; García‐Etxarri, Aitzol

doi:10.48550/arxiv.2003.07653

Cited by 4 publications

(4 citation statements)

References 41 publications

(51 reference statements)

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“…Several achiral systems featuring helicity-preserving resonances for enhanced sensing of chiral molecules have been reported. 22,29,30,33,35,37,39 Helicity preservation is achieved if and only if the TE and TM responses of the system are identical (see Chap. 2.4 in Ref.…”

Section: Introductionmentioning

confidence: 99%

On enhanced sensing of chiral molecules in optical cavities

Scott

Garcia-Santiago

Beutel

et al. 2021

Photonic and Phononic Properties of Engineered Nanostructures XI

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The differential response of chiral molecules to incident left-and right-handed circularly polarized light is used for sensing the handedness of molecules. Currently, significant effort is directed toward enhancing weak differential signals from the molecules, with the goal of extending the capabilities of chiral spectrometers to lower molecular concentrations or small analyte volumes. Previously, optical cavities for enhancing vibrational circular dichroism have been introduced. Their enhancements are mediated by helicity-preserving cavity modes which maintain the handedness of light due to their degenerate TE and TM components. In this article, we simplify the design of the cavity and numerically compare it with the previous one using an improved model for the response of chiral molecules. We use parameters of molecular resonances to show that the cavities are capable of bringing the vibrational circular dichroism signal over the detection threshold of typical spectrometers for concentrations that are one to three orders of magnitude smaller than those needed without the cavities, for a fixed analyte volume. Frequency resolutions of current spectrometers result in enhancements of more than one order (two orders) of magnitude for the new (previous) design. With improved frequency resolution, the new design achieves enhancements of three orders of magnitude. We show that the TE/ TM degeneracy in perfectly helicity-preserving modes is lifted by factors that are inherent to the cavities. More surprisingly, this degeneracy is also lifted by the molecules themselves due to their lack of electromagnetic duality symmetry, that is, due to the partial change of helicity during the light-molecule interactions.

show abstract

Section: Introductionmentioning

confidence: 99%

On enhanced sensing of chiral molecules in optical cavities

Scott

Garcia-Santiago

Beutel

et al. 2021

Photonic and Phononic Properties of Engineered Nanostructures XI

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show abstract

“…While helicity preserving resonances are not a must, they are optimal under some conditions 29 for enhancing the CD signal. Several achiral systems featuring helicity preserving resonances for enhanced sensing of chiral molecules have been reported 22,29,30,33,35,37,39 . Helicity preservation is achieved if and only if the TE and TM responses of the system are identical (see Chap.…”

Section: Introductionmentioning

confidence: 99%

On enhanced sensing of chiral molecules in optical cavities

Scott,

Garcia-Santiago,

Beutel

et al. 2021

Preprint

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The differential response of chiral molecules to incident left-and right-handed circularly polarized light is used for sensing the handedness of molecules. Currently, significant effort is directed towards enhancing weak differential signals from the molecules, with the goal of extending the capabilities of chiral spectrometers to lower molecular concentrations or small analyte volumes. Previously, optical cavities for enhancing vibrational circular dichroism have been introduced. Their enhancements are mediated by helicity-preserving cavity modes which maintain the handedness of light due to their degenerate TE and TM components. In this article, we simplify the design of the cavity, and numerically compare it with the previous one using an improved model for the response of chiral molecules. We use parameters of molecular resonances to show that the cavities are capable of bringing the vibrational circular dichroism signal over the detection threshold of typical spectrometers for concentrations that are one to three orders of magnitude smaller than those needed without the cavities, for a fixed analyte volume. Frequency resolutions of current spectrometers result in enhancements of more than one order (two orders) of magnitude for the new (previous) design. With improved frequency resolution, the new design achieves enhancements of three orders of magnitude. We show that the TE/TM degeneracy in perfectly helicity preserving modes is lifted by factors that are inherent to the cavities. More surprisingly, this degeneracy is also lifted by the molecules themselves due to their lack of electromagnetic duality symmetry, that is, due to the partial change of helicity during the light-molecule interactions.

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“…Quantum information can be encoded in photons within different degrees of freedom, such as transverse momentum, spatial path or time-bin, among others. In particular, the framework based on total angular momentum and helicity [11,12] has gained especial relevance due to applications such as the generation of states in high-dimensional Hilbert spaces [13,14], light-matter interactions [15], data transmission [16], and sensing of chirality in molecules [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Symmetry-protection of multiphoton states of light

Lasa-Alonso,

Molezuelas,

Varga

et al. 2020

Preprint

Self Cite

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In this manuscript we analyze the emergence of protected multiphoton states in scattering problems with cylindrical symmetry. In order to do that, we first provide a formal definition of the concept of postselected symmetry-protection. We show that symmetry-protected states are not limited to one-or two-photon states, on the contrary, it can be formally extended to the multiphoton case. In addition, we prove for the case of cylindrical symmetry that all possible multiphoton protected states are constructed from a small set of one-and two-photon states. Finally, we point out possible applications that symmetry-protected states may have in quantum communications, concretely, in the construction of decoherence-free subspaces.

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Surface-Enhanced Circular Dichroism spectroscopy on periodic dual nanostructures

Cited by 4 publications

References 41 publications

On enhanced sensing of chiral molecules in optical cavities

On enhanced sensing of chiral molecules in optical cavities

On enhanced sensing of chiral molecules in optical cavities

Symmetry-protection of multiphoton states of light

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