Optical Chirality Enhancement in Hollow Silicon Disk by Dipolar Interference

Du, Kang; Li, Pei; Wang, Heng; Gao, Kun; Liu, Rui-Bin; Lu, Fanfan; Zhang, Wending; Mei, Ting

doi:10.1002/adom.202001771

Cited by 14 publications

(17 citation statements)

References 43 publications

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“…The maximum chiral response of chiral spheres has been numerically simulated. Currently, chiral light-matter interaction is enhanced by seeking the optical field with strong optical chirality at a local point (e.g., [14,[16][17][18][19][20]). However, this route is only viable for a Rayleigh chiral scatterer.…”

Section: Discussionmentioning

confidence: 99%

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Achieving maximum scattering circular dichroism through the excitation of anapole states within chiral Mie nanospheres

Gan²,

Zhan³

2022

Phys. Rev. B

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The chirality-dependent asymmetric light-matter interaction can be enhanced using various artificial photonic structures as well as engineered incident field. Compared with chiral photonic structures, the engineered optical field is less explored and recently recognized as a new regime in tailoring light-matter interaction. In this work, we demonstrate that weakly chiral spheres can exhibit the maximum scattering circular dichroism (CD) by tailoring the incident field to construct chirality-sensitive anapole states. By considering the chiral terms radiated from Mie nanospheres as perturbation, a multiscattering model is established to predict the chiroptical Mie scattering response of these nanospheres. This model provides a specific guideline to tailor the incident field to realize the upper limit of the achievable scattering CD.

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Section: Discussionmentioning

confidence: 99%

“…For a point chiral dipole, the intensity of the CD signal is proved to be proportional to the local C value. Thus, in the past decade a significant amount effort has been devoted to realize superchiral light with larger C values than CPL beams to enhance CD signals [14,[16][17][18][19][20]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Achieving maximum scattering circular dichroism through the excitation of anapole states within chiral Mie nanospheres

Gan²,

Zhan³

2022

Phys. Rev. B

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“…The maximal Purcell enhancement is close to 100 folds at 1330 nm, higher than the situation of an individual structure mentioned above. The array provides a stronger Purcell enhancement because of the higher MLDOS enhancement with the existence of more adjacent structures [71]. While, for the far-field radiation, the radiation efficiency maintains above 90%.…”

Section: Insensitivity Of Purcell Factors To Emitter's Positionmentioning

confidence: 99%

Simultaneous magnetic and electric Purcell enhancement in a hybrid metal-dielectric nanostructure

Shan¹,

Liu²,

Ma³

et al. 2023

Preprint

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Hybrid metal-dielectric structures, which combine the advantages of both metal and dielectric materials, support high-confined but low-loss magnetic and electric resonances under deliberate arrangements. However, their potential for enhancing magnetic emission has not been explored. Here, we study the simultaneous magnetic and electric Purcell enhancement supported by a hybrid structure consisting of a dielectric nanoring and a silver nanorod. Such a structure enables low Ohmic loss and highly-confined field under the mode hybridization of magnetic resonances on nanoring and electric resonances on nanorod in the optical communication band. So, the 60-fold magnetic Purcell enhancement and 45-fold electric Purcell enhancement can be achieved simultaneously with > 95% of the radiation transmitted to far field. The position of emitter has a several-ten-nanometer tolerance for sufficiently large Purcell enhancement, which brings convenience to experimental fabrications.Moreover, an array formed by this hybrid nanostructure can further enhance the magnetic Purcell factors. The findings provide a possibility to selectively excite the magnetic and electric emission in integrated photon circuits. It may also facilitate brighter magnetic emission sources and light-emitting metasurfaces in a simpler arrangement.

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“…As defined in the first term of Equation ( 20), the radial optical force is a gradient force (Figure 7c). This term, the optical potential ⟨U⟩, is composed of three terms in Equation (21). A comparison of Equations ( 12) and (21) shows that the third term 1 2 Re[𝛼 em ]Im[E ⋅ H * ] is proportional to the product of the chirality of the particle and the chiral near-field of the beam.…”

Section: Chiral Field For Optical Trappingmentioning

confidence: 99%

Plasmonic and Photonic Enhancement of Chiral Near‐Fields

Sun

Nie

et al. 2022

Laser & Photonics Reviews

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A chiral near‐field with a highly contorted electromagnetic field builds a bridge to match chiral molecules and light wavelengths with large size differences. It significantly enhances the circular dichroism of chiral molecules and has great prospects in chirality sensing, detection, trapping, and other chirality‐related applications. Surface plasmons feature outstanding light‐trapping and electromagnetic‐field‐concentrating abilities. Plasmonic chiral nanostructures facilitate light manipulation to generate superchiral near‐fields. Meanwhile, the nanophotonic structures have attracted significant interest to obtain strong chiral near‐fields due to their unique electromagnetic resonant properties. During the interaction of light and chiral materials, the chiral near‐field not only bridges the light and chiral molecules but is also responsible for the optical activities. This paper reviews state‐of‐the‐art studies on generating or enhancing chiral near‐fields using plasmonic and photonic nanostructures. The principle of chiral near‐fields and the development of chiral near‐fields with plasmonic and photonic nanostructures are reviewed. The properties and applications of enhanced chiral near‐fields for chiral molecule detection, spin‐orbit angular interaction, and the generation of the chiral optical force are examined. Finally, current challenges are discussed and a brief outlook of this field is provided.

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Optical Chirality Enhancement in Hollow Silicon Disk by Dipolar Interference

Cited by 14 publications

References 43 publications

Achieving maximum scattering circular dichroism through the excitation of anapole states within chiral Mie nanospheres

Achieving maximum scattering circular dichroism through the excitation of anapole states within chiral Mie nanospheres

Simultaneous magnetic and electric Purcell enhancement in a hybrid metal-dielectric nanostructure

Plasmonic and Photonic Enhancement of Chiral Near‐Fields

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