Optical chirality density and flux measured in the local density of states of spiral plasmonic structures

Pham, Aline; Zhao, Airong; Genet, Cyriaque; Drezet, Aurélien

doi:10.1103/physreva.98.013837

Cited by 12 publications

(5 citation statements)

References 47 publications

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“…If optical reciprocity 12 is valid in the NFP imaging system, polarization maps taken by the NFP measurements should be identical to those of the optical fields in the vicinity of the nanostructured sample. The results of previous studies based on near-field experiments 9,13,14 support the validity of the optical reciprocity. The polarization state of the optical field was characterized by the degree of circular polarization (P CP ≡ (I L − I R )/(I L + I R ), where I L and I R denote the intensities of the LH and RH circular polarization components of the optical field, respectively).…”

Section: ■ Results and Discussionsupporting

confidence: 69%

Active Control of Chiral Optical near Fields on a Single Metal Nanorod

2019

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Chiral optical fields (typified by circularly polarized light) localized on the nanoscale enhance the chiral light− matter interaction, which may provide novel potential applications. This property enables the development of an ultrasensitive method for characterization of chiral molecules and nanoscale magnetic control realized by an all-optical method to interconnect spintronic nano-optical devices. A local chiral light source with switchable handedness or controllable chirality is indispensable for building such applications for practical use. In the current major method used for local chiral light generation, the handedness of the light is controlled by the handedness of the nanomaterial, which is not convenient when we need to change the handedness of the light. We experimentally achieve here generation and active control of a highly chiral local optical field by using a combination of an achiral gold nanorod and achiral linearly polarized optical field. By tilting the azimuth angle for the incident linear polarization relative to the axis of the nanorod, either left-or right-handed circularly polarized local optical fields can be generated. Our work may give us a chance to pioneer analytical applications of chiral optical fields and novel spintronic nano-optical devices.

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Section: ■ Results and Discussionsupporting

confidence: 69%

Active Control of Chiral Optical near Fields on a Single Metal Nanorod

2019

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“…Therefore, pEELS is directly proportional to the FT along z of the EMLDOS polarized in a plane perpendicular to the electron beam axis, while regular EELS is related to the FT of the EMLDOS polarized along the electron beam direction 20 . We emphasize that since u is any polarization of the Poincaré sphere, the latter equation extends the definition of the chiral EMLDOS described by Pham et al 45,46 Remarkably, it is evident that equation ( 8) is extremely similar to the decay rate enhancement of a dipole placed in an electromagnetic environment (Purcell effect 47 ), with the electron-transition dipole moment playing the role of a probe dipole (Supplementary Section 6.4). Therefore, this demonstrates that the transverse free f-h, The pEELS maps simulated with the Ψ 0 (f), Ψ x (g) and Ψ y (h) wavefunctions.…”

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confidence: 56%

Optical polarization analogue in free electron beams

2021

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“…Despite the advantages of this type of chiral plasmonic structure, setting nanoparticles at customized regions for high chiral interactions constitutes a major hurdle for practical biosensing applications. A recent approach to circumvent this latter issue is the use of plasmonic chiral metasurfaces [46][47][48][49][50][51][52][53][54], where several 2D plasmonic arrays with symmetry broken along the third dimension have been developed. These metasurfaces have their chiral plasmonic near-fields directly accessible to nearby molecules on the surface.…”

Section: Plasmonics For Enhanced Chiroptical Effectsmentioning

confidence: 99%

Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

Paiva-Marques

Gómez

Oliveira

et al. 2020

Sensors

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There has been growing interest in using strong field enhancement and light localization in plasmonic nanostructures to control the polarization properties of light. Various experimental techniques are now used to fabricate twisted metallic nanoparticles and metasurfaces, where strongly enhanced chiral near-fields are used to intensify circular dichroism (CD) signals. In this review, state-of-the-art strategies to develop such chiral plasmonic nanoparticles and metasurfaces are summarized, with emphasis on the most recent trends for the design and development of functionalizable surfaces. The major objective is to perform enantiomer selection which is relevant in pharmaceutical applications and for biosensing. Enhanced sensing capabilities are key for the design and manufacture of lab-on-a-chip devices, commonly named point-of-care biosensing devices, which are promising for next-generation healthcare systems.

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Optical chirality density and flux measured in the local density of states of spiral plasmonic structures

Cited by 12 publications

References 47 publications

Active Control of Chiral Optical near Fields on a Single Metal Nanorod

Active Control of Chiral Optical near Fields on a Single Metal Nanorod

Optical polarization analogue in free electron beams

Chiral Plasmonics and Their Potential for Point-of-Care Biosensing Applications

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