Free-Standing Plasmonic Chiral Metamaterials with 3D Resonance Cavities

Wang, Zengyao; Ai, Bin; Zhou, Ziwei; Guan, Yuduo; Möhwald, Helmuth; Zhang, Gang

doi:10.1021/acsnano.8b04106

Cited by 40 publications

(44 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rajaei et al experimentally reported giant circular dichroism (CD) with ramp-shaped plasmonic nanostructures [34]. In the above-mentioned works [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], we find that all designs are based on structure-surface-confined field effects to realize a variety of applications while ignoring spatial effects such as neutral atom trapping, an application that requires a noncontact field to be implemented.…”

Section: Introductionmentioning

confidence: 84%

“…Among them, there is a class of metamaterials with a special structure, named chiral metamaterials, which shows different electromagnetic response, also called chirality, to right-and left-handed circularly polarized (RCP and LCP) light [13][14][15]. This unique optical response renders chiral metamaterials highly promising candidates for a variety of applications [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. In general, chiral metamaterials are designed to be single-layered (planar chiral metamaterial) because of the relative ease of their fabrication [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tunable atom-trapping based on a plasmonic chiral metamaterial

et al. 2019

View full text Add to dashboard Cite

Chiral metamaterials provide a very convenient way to actively regulate the light field via external means, which is very important in nanophotonics. However, the very weak chiral response of a generally planar metamaterial severely limits its application. Therefore, it is important to design a system with large circular dichroism. Here we report an optical metamaterial with strong chirality in a bilayer gear-shaped plasmonic structure and consider this chiral response of such fields on tunable atom (87Rb) trapping. Simulation results show that maximum chiral response is observed when the two layers of the gear-shaped structures are rotated from each other by an angle of 60° at λ = 760 nm. Also, we demonstrate an active tunable potential for three-dimensional stable atom-trapping with tunable range of position and potential of a neutral atom of ~58 nm and ~1.3N mK (N denotes the input power with unit mW), respectively. In addition, the trap centers are about hundreds of nanometers away from the structure surface, which ensures the stability of the trapping system. The regulation of neutral atom trapping broadens the application of chiral metamaterials and has potential significance in the manipulation of cold atoms.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Tunable atom-trapping based on a plasmonic chiral metamaterial

et al. 2019

View full text Add to dashboard Cite

show abstract

“…However, the deposition incident angle and azimuth angle must be precisely controlled. [ 31,39 ] In the nanotransfer printing method, nanocrescent structures are fabricated by transfer printing with oblique shadow metal deposited polydimethylsiloxane (PDMS) stamps. Their sizes are adjusted by controlling the printing pressure.…”

Section: Introductionmentioning

confidence: 99%

Engineering Colloidal Lithography and Nanoskiving to Fabricate Rows of Opposing Crescent Nanogaps

Zhang

Zhao

et al. 2020

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

A scalable fabrication route combining colloidal lithography and nanoskiving is reported for generating free‐standing asymmetric metal nanostructures of crescent‐shaped gold nanowires and rows of opposing crescents with and without nanogaps. Strong localized surface plasmon resonances and propagating surface plasmon polaritons are excited at the sharp tips of the crescent and in the sub‐10 nm nanogaps. High‐order resonance modes are excited due to the coupling between the resonances in the tips and gaps. The Raman signals are greatly enhanced due to the strong electric fields. In addition, the optical responses and electric field distributions can be controlled by the polarization of the incident light. The strong electric field enhancement coupled with facile, scalable fabrication make crescent‐shaped nanostructures promising in nonlinear optics, optical trapping, and surface‐enhanced spectroscopy.

show abstract

“…Dry etching of metal films through a nanostructured mask is fundamentally similar to focused ion beam milling, yet it is a much faster process. With the dry etching, large areas of nanocones can be produced on planar or even non-planar surfaces [10,18,[23][24][25][26][27][28][29][30]. The third fabrication strategy is based on the self-formation of nanocones inside cylindrical nanowell templates during the deposition of the respective metal, making use of an effect which is known as aperture clogging or self-shading [15,23,31,32].…”

Section: Introductionmentioning

confidence: 99%

Effect of deposition angle on fabrication of plasmonic gold nanocones and nanodiscs

Liška

Ligmajer

Pinho

et al. 2020

Microelectronic Engineering

View full text Add to dashboard Cite

Metal nanocones can exhibit several strong plasmonic resonances, which are associated with intense and accessible electromagnetic hot spots. They can thus be used to enhance light-matter interactions or to facilitate location-specific sensing while enabling separation of some non-specific contributions towards the sensing signal. Nanocones and similar 3D structures are often fabricated with the use of the so-called self-shading effect, which occurs during the evaporation of a metal film into circular nanowells. Unfortunately, a full description of a successful deposition process with all the essential details is currently missing in literature. Here we present a detailed view of the fabrication of ordered arrays of conical gold nanostructures using electron beam lithography and gold electron beam evaporation. We show that the symmetry of the fabricated nanostructures is influenced by the lateral position of the substrate on the sample holder during the deposition. Off-axis deposition or tilt of the sample leads to asymmetric nanostructures. When the deposited film is thick enough, or the nanowells narrow enough, the entrance aperture is clogged, and nanocones with sharp tips are formed. In contrast, flat-top truncated cones are produced for thinner films or wider nanowells. All these findings help to identify inherent limits for the production of wafer-scale arrays of such non-planar nanostructures. On the other hand, they also suggest new fabrication possibilities for more complicated structures such as mutually connected nanocones for electrically addressable chips.

show abstract

Free-Standing Plasmonic Chiral Metamaterials with 3D Resonance Cavities

Cited by 40 publications

References 58 publications

Tunable atom-trapping based on a plasmonic chiral metamaterial

Tunable atom-trapping based on a plasmonic chiral metamaterial

Engineering Colloidal Lithography and Nanoskiving to Fabricate Rows of Opposing Crescent Nanogaps

Effect of deposition angle on fabrication of plasmonic gold nanocones and nanodiscs

Contact Info

Product

Resources

About