Related Experiment Video
Updated: Feb 1, 2026
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
16.1K
Wide Angle Dynamically Tunable Enhanced Infrared Absorption on Large-Area Nanopatterned Graphene
Alireza Safaei1,2, Sayan Chandra2, Michael N Leuenberger1,2,3
1Department of Physics , University of Central Florida , Orlando , Florida 32816 , United States.
ACS Nano
|December 12, 2018
Summary
Researchers enhanced infrared light absorption using Dirac plasmons in patterned graphene. This method achieves high absorption in the 8-12 μm band, showing potential for optoelectronic devices.
Area of Science:
- Plasmonics
- Optoelectronics
- Materials Science
Background:
- Enhancing light-matter interaction is crucial for infrared absorption.
- Dirac plasmons in patterned graphene offer a route to high absorption.
Purpose of the Study:
- To investigate Dirac plasmon excitation in nanopatterned monolayer graphene.
- To analyze factors influencing light absorption spectra, including plasmon lifetime and incident light properties.
- To demonstrate tunable infrared absorption using electrostatic gating.
Main Methods:
- Fabrication of hexagonal planar arrays of nanoholes and nanodisks.
- Integration of an aluminum oxide (Al2O3) layer for electrostatic tuning of the Fermi level.
- Theoretical and experimental analysis of light absorption spectra under varying conditions (polarization, angle, dimensions).
Main Results:
- Achieved peak absorptions of 60% (nanohole) and 90% (nanodisk) in the 8-12 μm infrared band.
- Demonstrated high spectral tunability via electrostatic gating.
- Showcased angular dependence of light absorption for both s- and p-polarized light.
Conclusions:
- Low carrier mobility CVD-grown graphene is suitable for wide-angle infrared absorption.
- The developed nanopatterned graphene structures are promising for next-generation optoelectronic devices.
- This work highlights the potential of Dirac plasmons for efficient light absorption applications.
Related Concept Videos
01:13Contact Angle
19.6K
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
19.6K
01:19Drug Absorption: Factors Affecting GI Absorption
6.2K
The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
6.2K
01:27Open Angle Glaucoma: Treatment
996
In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Drugs such as carbonic anhydrase inhibitors, α2- and...
996
01:13Angle of Twist: Problem Solving
793
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
793
01:05Absorption of Radiation
1.3K
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
1.3K
01:12Protein Absorption
1.0K
Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
1.0K