Enhancing Circular Dichroism Signals with Vector Beams

Ye, Lyuzhou; Yang, Longqing; Zheng, Xiao; Mukamel, Shaul

doi:10.1103/physrevlett.126.123001

Cited by 16 publications

(14 citation statements)

References 52 publications

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“…The CIDS signals usually have weak magnitude in the range

–

[ 31 , 40 ]; however, in principle, CIDS value about

can be measured [ 40 ]. The studies were reported to enhance the magnitude of CD signal [ 41 , 42 ], and this may potentially be extended in the scattering regime to CIDS signals. The CD was utilized to characterize the various polymers [ 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Chromatin Fiber to Characterize Its Organization Using Angle-Resolved Scattering of Circularly Polarized Light

2021

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Understanding the structural organization of chromatin is essential to comprehend the gene functions. The chromatin organization changes in the cell cycle, and it conforms to various compaction levels. We investigated a chromatin solenoid model with nucleosomes shaped as cylindrical units arranged in a helical array. The solenoid with spherical-shaped nucleosomes was also modeled. The changes in chiral structural parameters of solenoid induced different compaction levels of chromatin fiber. We calculated the angle-resolved scattering of circularly polarized light to probe the changes in the organization of chromatin fiber in response to the changes in its chiral parameters. The electromagnetic scattering calculations were performed using discrete dipole approximation (DDA). In the chromatin structure, nucleosomes have internal interactions that affect chromatin compaction. The merit of performing computations with DDA is that it takes into account the internal interactions. We demonstrated sensitivity of the scattering signal’s angular behavior to the changes in these chiral parameters: pitch, radius, the handedness of solenoid, number of solenoid turns, the orientation of solenoid, the orientation of nucleosomes, number of nucleosomes, and shape of nucleosomes. These scattering calculations can potentially benefit applying a label-free polarized-light-based approach to characterize chromatin DNA and chiral polymers at the nanoscale level.

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“…The CIDS signals usually have weak magnitude in the range

–

[ 31 , 40 ]; however, in principle, CIDS value about

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Chromatin Fiber to Characterize Its Organization Using Angle-Resolved Scattering of Circularly Polarized Light

2021

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“…This is because that CD requires the coupling between electric and magnetic dipoles [13], while the usual absorption only requires electric dipole and thus is the much stronger. To enhance the chiral signals and the sensitivity of chiral discrimination, various methods have been proposed, such as using the superchiral field of a standing wave [14], vector beams with strong longitudinal components [15], chiral microwave three-wave mixing [16], plasmonic nanostructures [17][18][19][20][21][22], and metasurfaces [23][24][25][26]. Photoexcitation circular dichroism was also shown to have orders of magnitude improvement on the sensitivity [27].…”

Section: Introductionmentioning

confidence: 99%

Chiral discrimination by polarization singularities of a metal sphere

Jia,

Peng,

Cheng

et al. 2021

Preprint

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The practical applications of chiral discrimination are usually limited by the weak chiral response of enantiomers and the high complexity of detection methods. Here, we propose to use the C lines (i.e., lines of polarization singularities) emerged in light scattering by a metal sphere to detect the chirality of small chiral particles. Using full-wave numerical simulations and analytical multipole expansions, we determined the absorption dissymmetry of the chiral particles at different positions on the C lines and found that it can be much larger than that induced by circularly polarized plane wave excitation. We uncover that the large dissymmetry factor is attributed to the asymmetric absorption of electric and magnetic dipoles induced by the C lines. The results can generate novel methods of chiral discrimination and may find applications in optical manipulations, optical sensing, and chiral quantum optics.

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“…46 This work, utilizing variable superposition of SAM and OAM, may find applications in spin-based nano-optics and next-generation chiroptical spectroscopy. 47 In addition, we expect that the strong chiroptical responses generated by spin−orbit coupling effects can provide a new physical insight into the origin of chiroptical activity.…”

mentioning

confidence: 99%

“…Moreover, we may extend the concept from a single microdisk to a large array of microdisks to achieve strong coupling between incident vortex beams and the microdisks with small beam divergence . This work, utilizing variable superposition of SAM and OAM, may find applications in spin-based nano-optics and next-generation chiroptical spectroscopy . In addition, we expect that the strong chiroptical responses generated by spin–orbit coupling effects can provide a new physical insight into the origin of chiroptical activity.…”

mentioning

confidence: 99%

Direct Observation of Spin–Orbit Interaction of Light via Chiroptical Responses

Liu

Chen

et al. 2022

Nano Lett.

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The spin–orbit interaction of light is a fundamental manifestation of controlling its angular momenta with numerous applications in photonic spin Hall effects and chiral quantum optics. However, observation of an optical spin Hall effect, which is normally very weak with subwavelength displacements, needs quantum weak measurements or sophisticated metasurfaces. Here, we theoretically and experimentally demonstrate the spin–orbit interaction of light in the form of strong chiroptical responses by breaking the in-plane inversion symmetry of a dielectric substrate. The chiroptical signal is observed at the boundary of a microdisk illuminated by circularly polarized vortex beams at normal incidence. The generated chiroptical spectra are tunable for different photonic orbital angular momenta and microdisk diameters. Our findings, correlating photonic spin–orbit interaction with chiroptical responses, may provide a route for exploiting optical information processing, enantioselective sensing, and chiral metrology.

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Enhancing Circular Dichroism Signals with Vector Beams

Cited by 16 publications

References 52 publications

Computational Modeling of Chromatin Fiber to Characterize Its Organization Using Angle-Resolved Scattering of Circularly Polarized Light

Computational Modeling of Chromatin Fiber to Characterize Its Organization Using Angle-Resolved Scattering of Circularly Polarized Light

Chiral discrimination by polarization singularities of a metal sphere

Direct Observation of Spin–Orbit Interaction of Light via Chiroptical Responses

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