Related Experiment Video
Updated: Jun 24, 2025
09:49
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
16.0K
Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications
1The institute of Optics, University of Rochester, Rochester, NY 14627, United States of America.
Summary
Ultrafast carrier dynamics in 2D materials are crucial for nanoelectronics. Multiphoton-pumped UV-Vis transient absorption spectroscopy effectively monitors these dynamics, influenced by material interfaces and laser fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Two-dimensional (2D) materials are pivotal for next-generation nanoelectronics due to their nanoscale thickness and unique properties.
- Carrier dynamics in 2D materials are significantly affected by interfaces, light penetration depth, and carrier mean free path.
Purpose of the Study:
- To review the fundamental concepts of multiphoton-pumped UV-Vis transient absorption spectroscopy.
- To discuss the application of this technique for studying ultrafast carrier dynamics in various 2D materials.
Main Methods:
- Utilizing multiphoton-pumped UV-Vis transient absorption spectroscopy.
- Investigating ultrafast carrier dynamics influenced by interfacial potential barriers and laser fields.
- Exploring the inverse bremsstrahlung mechanism for light absorption by carriers.
Main Results:
- Demonstrated the capability of UV-Vis transient absorption spectroscopy to monitor ultrafast carrier dynamics in 2D materials.
- Highlighted the significant impact of interfaces and laser fields on photoexcited carrier behavior.
- Showcased the application of the technique across diverse 2D materials, including transition-metal dichalcogenide monolayers and topological insulators.
Conclusions:
- Multiphoton-pumped UV-Vis transient absorption spectroscopy is a powerful tool for understanding ultrafast carrier dynamics in 2D materials.
- Interface effects and laser-matter interactions play a critical role in the optoelectronic properties of 2D materials.
- This spectroscopic method offers insights into the fundamental physics governing 2D semiconductor structures.
Related Concept Videos
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
1.4K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.4K
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
2.6K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
2.6K
01:14UV–Vis Spectrometers
1.3K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
1.3K
01:32UV–Vis Spectroscopy of Conjugated Systems
6.9K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
One of the factors influencing λmax is the extent...
6.9K
01:30UV–Vis Spectrum
1.1K
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
1.1K
01:16Spectrophotometry: Introduction
3.0K
Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
3.0K