scholarly journals Plasmonic magneto-optical nested 2D nanostructures: tailoring responses through effective refractive index

2018 ◽  
Vol 190 ◽  
pp. 03011
Author(s):  
Alexey Shaimanov ◽  
Alexander Baryshev
Keyword(s):  
Refractive Index ◽  
Effective Refractive Index ◽  
Structural Parameters ◽  
Optical Response ◽  
Two Dimensional ◽  
Dimensional Lattice ◽  
Optical Responses ◽  
Plasmon Resonances

Spectra of a nested square two-dimensional lattice of metal nanospheres encased in a magneto-optical host were studied. We show that the magneto-optical response of the nanostructures considerably increases due to the plasmon resonances. Moreover, the optical and magneto-optical responses can be strongly altered with a negligible change in structural parameters.

scholarly journals Bandgap Control in Two-Dimensional Semiconductors via Coherent Doping of Plasmonic Hot Electrons

2020 ◽  
Author(s):  
Yu-Hui Chen ◽  
Ronnie Tamming ◽  
Kai Chen ◽  
Zhepeng Zhang ◽  
Fengjiang Liu ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Hot Electrons ◽  
Two Dimensional ◽  
Effective Measure ◽  
Plasmonic Crystal ◽  
Optical Responses ◽  
2D Semiconductors ◽  
Coherent Coupling ◽  
Plasmon Resonances ◽  
First Time

Abstract Bandgap control is of central importance for semiconductor Technologies. The traditional means of control is to dope the lattice chemically, electrically or optically with charge carriers. Here, we demonstrate for the first time a widely tunable bandgap (renormalisation up to 650 meV at room-temperature) in two-dimensional (2D) semiconductors by coherently doping the lattice with plasmonic hot electrons. In particular, we integrate tungsten-disulfide (WS_2) monolayers into a self-assembled plasmonic crystal, which enables coherent coupling between semiconductor excitons and plasmon resonances. Accompanying this process, the plasmon-induced hot electrons can repeatedly fill the WS2 conduction band, leading to population inversion and a significant reconstruction in band structures and exciton relaxations. Our findings provide an innovative and effective measure to engineer optical responses of 2D semiconductors, allowing a great flexibility in design and optimisation of photonic and optoelectronic devices.

Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets

2020 ◽  
Vol 5 (10) ◽  
pp. 1420-1429 ◽  
Author(s):  
Lei Zhang ◽  
Shah Fahad ◽  
Hao-Ran Wu ◽  
Tao-Tao Dong ◽  
Zi-Zhen Chen ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Strong Influence ◽  
Optical Response ◽  
Carrier Dynamics ◽  
Nonlinear Optical Response ◽  
Two Dimensional ◽  
Size Dependent ◽  
Optical Responses ◽  
Size Controlled

We developed a size-controlled intercalation method to prepare Sb nanosheets. A distinct size-dependent nonlinear optical response, unveiling the strong influence of the scale of the Sb nanosheets on the carrier dynamics was observed.

scholarly journals Bandgap control in two-dimensional semiconductors via coherent doping of plasmonic hot electrons

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yu-Hui Chen ◽  
Ronnie R. Tamming ◽  
Kai Chen ◽  
Zhepeng Zhang ◽  
Fengjiang Liu ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Hot Electrons ◽  
Two Dimensional ◽  
Central Importance ◽  
Effective Measure ◽  
Plasmonic Crystal ◽  
Optical Responses ◽  
2D Semiconductors ◽  
Coherent Coupling ◽  
Plasmon Resonances

AbstractBandgap control is of central importance for semiconductor technologies. The traditional means of control is to dope the lattice chemically, electrically or optically with charge carriers. Here, we demonstrate a widely tunable bandgap (renormalisation up to 550 meV at room-temperature) in two-dimensional (2D) semiconductors by coherently doping the lattice with plasmonic hot electrons. In particular, we integrate tungsten-disulfide (WS2) monolayers into a self-assembled plasmonic crystal, which enables coherent coupling between semiconductor excitons and plasmon resonances. Accompanying this process, the plasmon-induced hot electrons can repeatedly fill the WS2 conduction band, leading to population inversion and a significant reconstruction in band structures and exciton relaxations. Our findings provide an effective measure to engineer optical responses of 2D semiconductors, allowing flexibilities in design and optimisation of photonic and optoelectronic devices.

scholarly journals Optical properties of electrochemically etched N-type silicon wafers for solar cell applications

2020 ◽  
Vol 71 (6) ◽  
pp. 406-412
Author(s):  
Martin Králik ◽  
Matej Goraus ◽  
Emil Pinčík
Keyword(s):  
Refractive Index ◽  
Theoretical Model ◽  
Effective Refractive Index ◽  
Crystalline Silicon ◽  
Optical Response ◽  
Theoretical Modeling ◽  
Silicon Wafers ◽  
Experimental Measurements ◽  
Type Silicon ◽  
Vis Spectroscopy

AbstractThe presented experiments and studies are intended for photovoltaic applications of crystalline silicon. This work deals with chemical treatment of the surface of n-type silicon wafers with different resistivity to reduce their reflectivity. Chemical surface treatment of silicon is an alternative method to using the antireflection layer. Optical losses caused by the reflection of light from the surface of the solar cells significantly reduce their efficiency. The investigated samples were prepared by the electrochemical etching method in the solution based on hydrofluoric acid and ethanol. The analysis of the prepared samples is divided into two parts, namely experimental measurements, and theoretical modeling. Experimental measurements are performed using UV-VIS spectroscopy, spectroscopic ellipsometry and SEM microscopy. Theoretical modeling is based on the construction and optimization of theoretical model of optical response (reflectivity and ellipsometric parameters) to determine the effective refractive index and thickness of formed structure. Effective refractive index of studied samples in theoretical model of optical response is based on Looyenga effective medium approximation and Tauc-Lorentz dispersion model.

Sign in / Sign up

Export Citation Format

Share Document