Plasmonic metamaterials at visible and ultraviolet frequencies (Conference Presentation)

Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials

Nanomaterials ◽

10.3390/nano11071808 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1808

Author(s):

Liqiang Zhuo ◽

Huiru He ◽

Ruimin Huang ◽

Shaojian Su ◽

Zhili Lin ◽

...

Keyword(s):

Group Velocity ◽

Light Field ◽

Slow Light ◽

Dielectric Materials ◽

Degree Of Freedom ◽

Geometrical Parameters ◽

Edge States ◽

Velocity Modulation ◽

Plasmonic Metamaterials ◽

On Chip

The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edges at the inverse valley Hall phase interfaces composed of ordinary optical dielectric materials, the dispersion and the frequency range of the edge states cannot be tuned once the geometrical parameters of the materials are determined. In this paper, we propose a chirped valley graphene plasmonic metamaterial waveguide composed of the valley graphene plasmonic metamaterials (VGPMs) with regularly varying chemical potentials while keeping the geometrical parameters constant. Due to the excellent tunability of graphene, the proposed waveguide supports group velocity modulation and zero group velocity of the edge states, where the light field of different frequencies focuses at different specific locations. The proposed structures may find significant applications in the fields of slow light, micro–nano-optics, topological plasmonics, and on-chip light manipulation.

Download Full-text

Deposition pressure-induced microstructure control and plasmonic property tuning in hybrid ZnO-AgxAu1-x thin films

Nanoscale Advances ◽

10.1039/d0na00887g ◽

2021 ◽

Author(s):

Robynne Lynne PALDI ◽

Xing Sun ◽

Xin Li Phuah ◽

Juanjuan Lu ◽

Xinghang Zhang ◽

...

Keyword(s):

Thin Film ◽

Thin Films ◽

Pulsed Laser Deposition ◽

Pulsed Laser ◽

Laser Deposition ◽

Deposition Method ◽

Hybrid Films ◽

Deposition Pressure ◽

Plasmonic Metamaterials ◽

Film Form

Self-assembled oxide-metallic alloyed nanopillars as hybrid plasmonic metamaterials (e.g., ZnO-AgxAu1-x) in a thin film form are grown using a pulsed laser deposition method. The hybrid films were demonstrated to be...

Download Full-text