Chiral near-fields around chiral dolmen nanostructure

Fu, Tao; Wang, Tiankun; Chen, Yuyan; Wang, Yongkai; Yu, Qingxu; Zhang, Zhongyue

doi:10.1088/1361-6463/aa8f81

Cited by 10 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure b shows the optical extinction spectra for incident wave vectors along z ̂ and polarizations (red) and (blue). As observed for related rod structures, , both incident field helicities couple, albeit with unequal strengths, to the bonding and antibonding rod modes, marked as vertical dashed gray lines, at 2.03 and 2.12 eV, respectively. The optical circular dichroism (CD) spectrum, the difference between extinction spectra for polarized plane wave excitation, is shown in black and exhibits the rod system’s chiral response.…”

supporting

confidence: 59%

Polarization-Resolved Electron Energy Gain Nanospectroscopy With Phase-Structured Electron Beams

et al. 2022

View full text Add to dashboard Cite

Free-electron-based measurements in scanning transmission electron microscopes (STEMs) reveal valuable information on the broadband spectral responses of nanoscale systems with deeply subdiffraction limited spatial resolution. Leveraging recent advances in manipulating the spatial phase profile of the transverse electron wavefront, we theoretically describe interactions between the electron probe and optically stimulated nanophotonic targets in which the probe gains energy while simultaneously transitioning between transverse states with distinct phase profiles. Exploiting the selection rules governing such transitions, we propose phase-shaped electron energy gain nanospectroscopy for probing the 3D polarization-resolved response field of an optically excited target with nanoscale spatial resolution. Considering ongoing instrumental developments, polarized generalizations of STEM electron energy loss and gain measurements hold the potential to become powerful tools for fundamental studies of quantum materials and their interaction with nearby nanostructures supporting localized surface plasmon or phonon polaritons as well as for noninvasive imaging and nanoscale 3D field tomography.

show abstract

supporting

confidence: 59%

Polarization-Resolved Electron Energy Gain Nanospectroscopy With Phase-Structured Electron Beams

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Nanoparticles placed in proximity can present a large amount of charges at the gap edges and generate strong electric-field enhancement . Therefore, the coupled plasmonic systems showed a wide range of applications in plasmon rulers, surface-enhanced Raman spectroscopy (SERS), and biosensors. − It has been theoretically predicted that 3D chiral dolmen nanostructures exhibit a strong enhancement of chiral field arising from the coupling of SPR sustained by each nanorod . However, large plasmonic chirality achieved by near-field coupling has rarely been reported in planar chiral nanostructures with the advantages of easy fabrication, low cost, and accessible hotspots.…”

Section: Introductionmentioning

confidence: 99%

“…24−26 It has been theoretically predicted that 3D chiral dolmen nanostructures exhibit a strong enhancement of chiral field arising from the coupling of SPR sustained by each nanorod. 27 However, large plasmonic chirality achieved by near-field coupling has rarely been reported in planar chiral nanostructures with the advantages of easy fabrication, low cost, and accessible hotspots.…”

Section: ■ Introductionmentioning

confidence: 99%

Strong Near-Field Coupling for Enhancing Plasmonic Chirality Toward Single-Molecule Sensing

et al. 2022

View full text Add to dashboard Cite

Plasmonic chirality shows great potential in analytical chemistry, biomedicine, and life science due to the strong chiroptical response generated from metallic nanostructures. However, significant chiral effects are mainly realized in three-dimensional structures because of their high structural asymmetry and large plasmon mode volume. This paper describes planar plasmonic “τ”-shaped structure arrays that can obtain significantly enhanced chiroptical responses for single-molecule detection. The “τ”-shaped structure arrays based on a chiral–achiral coupling scheme are constructed to generate a large superchiral field and enhanced circular dichroism (CD). Numerical simulations show that the chiroptical responses can be efficiently manipulated by the near-field coupling strength of plasmons determined by the parameters of the arrays and the structural chirality of the unit cells. The planar “τ”-shaped structure arrays with a large CD signal and enhanced superchiral field enable ultrasensitive detection of single-molecule bovine serum albumin (BSA) protein.

show abstract

“…Due to this polarization-sensitive resonance, the chiral responsibility of nanogap structures is studied. Until now, planar nanogap structures, including dolmen structures [11] , split rings [12] , and vortex gaps [13] , were developed for giant chiral response.…”

Section: Introductionmentioning

confidence: 99%

Chiral plasmonic nanostructure of twistedly stacked nanogaps

Zhang

Huang

et al. 2021

中国光学快报

View full text Add to dashboard Cite

Nanogap plasmonic structures with strong coupling between separated components have different responses to orthogonal-polarized light, giving rise to giant optical chirality. Here, we proposed a three-dimensional (3D) nanostructure that consists of two vertically and twistedly aligned nanogaps, showing the hybridized charge distribution within 3D structures. It is discovered that the structure twisted by 60°exhibits plasmonic coupling behavior with/without gap modes for different circular-polarized plane waves, showing giant chiral response of 60% at the wavelength of 1550 nm. By controlling the disk radius and the insulator layer, the circular dichroism signal can be further tuned between 1538 and 1626 nm.

show abstract

Chiral near-fields around chiral dolmen nanostructure

Cited by 10 publications

References 28 publications

Polarization-Resolved Electron Energy Gain Nanospectroscopy With Phase-Structured Electron Beams

Polarization-Resolved Electron Energy Gain Nanospectroscopy With Phase-Structured Electron Beams

Strong Near-Field Coupling for Enhancing Plasmonic Chirality Toward Single-Molecule Sensing

Chiral plasmonic nanostructure of twistedly stacked nanogaps

Contact Info

Product

Resources

About