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 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.

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.

Flexo-photoelectronic effect in n-type/p-type two-dimensional semiconductors and a deriving light-stimulated artificial synapse

2021 ◽  
Author(s):  
Xiang Wang ◽  
Xin Zhou ◽  
Anyang Cui ◽  
Menghan Deng ◽  
Xionghu Xu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
2D Semiconductors ◽  
Artificial Synapse ◽  
P Type

We demonstrate flexo-photoelectronic effects of both n-type and p-type 2D semiconductors.

Tunable Plasmon Resonances in Two-Dimensional Molybdenum Oxide Nanoflakes

2014 ◽  
Vol 26 (23) ◽  
pp. 3931-3937 ◽  
Author(s):  
Manal M. Y. A. Alsaif ◽  
Kay Latham ◽  
Matthew R. Field ◽  
David D. Yao ◽  
Nikhil V. Medehkar ◽  
...  
Keyword(s):  
Molybdenum Oxide ◽  
Two Dimensional ◽  
Plasmon Resonances

Exciton dynamics and annihilation in WS2 2D semiconductors

Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7402-7408 ◽  
Author(s):  
Long Yuan ◽  
Libai Huang
Keyword(s):  
Two Dimensional ◽  
Time Resolved ◽  
Exciton Dynamics ◽  
2D Semiconductors ◽  
Time Resolved Photoluminescence ◽  
2D Crystals

We systematically investigate the exciton dynamics in monolayered, bilayered, and trilayered WS2 two-dimensional (2D) crystals by time-resolved photoluminescence (TRPL) spectroscopy.

scholarly journals Spatial Separation of Plasmonic Hot Electron Generation and a Hydrodehalogenation Reaction Center Using a DNA Wire

2021 ◽  
Author(s):  
Sergio Kogikoski Junior ◽  
Anushree Dutta ◽  
Ilko Bald
Keyword(s):  
Spatial Separation ◽  
Decomposition Reaction ◽  
Charge Carriers ◽  
Hot Electrons ◽  
Hot Electron ◽  
Plasmonic Nanoparticle ◽  
Double Stranded Dna ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

<p>Using hot charge carriers far from a plasmonic nanoparticle surface is very attractive for many applications in catalysis and nanomedicine, and will lead to a better understanding of plasmon-induced processes, such as hot charge carrier or heat driven chemical reactions. Herein we show that DNA is able to transfer hot electrons generated by a silver nanoparticle over several nanometers to drive a chemical reaction in a molecule non-adsorbed on the surface. For this we use 8-bromo-adenosine introduced in different positions within a double stranded DNA oligonucleotide. The DNA is also used to assemble the nanoparticles into superlattices enabling the use of surface enhanced Raman scattering to track the decomposition reaction. To prove the DNA mediated transfer, the probe molecule was insulated from the charge carriers source, which hindered the reaction. The results indicate that DNA can provide an attractive platform to study the transfer of hot electrons, leading to the future development of more advanced plasmonic catalysts. </p>

scholarly journals Исследование параметров двумерного электронного газа в квантовых ямах InGaN/GaN методом терагерцового плазмонного резонанса

2021 ◽  
Vol 55 (11) ◽  
pp. 1059
Author(s):  
Е.Р. Бурмистров ◽  
Л.П. Авакянц
Keyword(s):  
Quantum Wells ◽  
Terahertz Spectroscopy ◽  
Radiation Power ◽  
Electron Gas ◽  
Femtosecond Laser Pulses ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Plasmon Resonances ◽  
Dimensional Electron Gas

A new approach to determining the parameters of a two-dimensional electron gas in InGaN/GaN quantum wells is proposed. It is based on the method of terahertz spectroscopy with time resolution, within the framework of which the terahertz frequencies of two-dimensional plasmon resonances excited in the studied samples of InGaN/AlGaN/GaN heterostructures by femtosecond laser pulses at a wavelength of 797 nm were recorded. Oscillating behavior of the output terahertz radiation power with minima in the frequency range 1−5 THz is shown, which is associated with the excitation of plasmon oscillations in a two-dimensional electron gas localized in an InGaN/GaN quantum well. During the processing of terahertz spectra, the effect of renormalization of the effective mass of two-dimensional electron gas, as well as phase modulation near the frequencies of plasmon resonances with an increase in the temperature of the sample from 90 to 170 K, was found. The proposed method is non-contact and can be used in a wide temperature range.

Nonlinear optical responses in two-dimensional photonic crystals

2009 ◽  
Vol 518 (2) ◽  
pp. 470-472 ◽  
Author(s):  
Shin-ichiro Inoue ◽  
Shiyoshi Yokoyama
Keyword(s):  
Photonic Crystals ◽  
Nonlinear Optical ◽  
Two Dimensional ◽  
Optical Responses

scholarly journals Synthesis of Porous ZnO Nanosheets and Carbon Nanotube Hybrids as Efficient Photocatalysts via Pulsed Laser Ablation

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 787 ◽  
Author(s):  
Yun Yeol Ryu ◽  
Taekyung Kim ◽  
HyukSu Han
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Charge Carriers ◽  
Two Dimensional ◽  
One Dimensional ◽  
Promising Strategy ◽  
Zno Nanosheets ◽  
Short Time ◽  
Laser Ablation Technique

Zinc oxide (ZnO) has attractive photocatalytic properties. However, the high recombination rate of the photo-excited charge carriers on this material often restricts application. Here, we report that hybridization of one dimensional (1D) carbon nanotubes (CNT) on two dimensional (2D) porous ZnO nanosheets (NS) can be a promising strategy to overcome some of the challenges of ZnO. Specifically, a pulsed laser ablation technique was utilized to hybridize 1D CNT with 2D porous ZnO NS in environmentally friendly as well as super-economic (short time, less than 10 min) conditions. The synthesized ZnO NS-CNT hybrids show a significantly enhanced photocatalytic activity for water splitting relative to their counterpart ZnO NS.

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