Related Experiment Video
Updated: Jan 28, 2026
10:54
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
15.3K
Electric and Magnetic Hotspots via Hollow InSb Microspheres for Enhanced Terahertz Spectroscopy
Mahdiyeh Sadrara1, MirFaez Miri2
1Department of Physics, University of Tehran, P.O. Box 14395-547, Tehran, Iran.
Scientific Reports
|March 1, 2019
Summary
Researchers explored electric and magnetic hotspots in indium antimonide (InSb) microspheres. These hotspots can be tuned for enhanced terahertz (THz) field interactions, showing promise for spectroscopy applications.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Terahertz (THz) Science
Background:
- Hollow microspheres offer tunable electromagnetic responses.
- Indium antimonide (InSb) exhibits unique electronic and optical properties.
- Controlling field enhancements in the terahertz gap is crucial for advanced spectroscopy.
Purpose of the Study:
- To investigate electric and magnetic hotspots in InSb microsphere dimers and trimers.
- To explore the tunability of field enhancement by varying microsphere parameters and temperature.
- To assess the potential of these hotspots for terahertz absorption and circular dichroism spectroscopy.
Main Methods:
- Numerical simulations of electromagnetic field distribution.
- Parametric studies involving microsphere radius, core volume fraction, gap distance, and temperature.
- Analysis of field enhancement factors across a range of terahertz frequencies.
Main Results:
- Significant electric and magnetic field enhancements were observed in the gap between InSb microspheres.
- Field enhancement factors were found to be dependent on microsphere geometry, material properties, and ambient temperature.
- Specific configurations (e.g., 80 μm radius spheres, 2 μm gap, 295 K) yielded substantial enhancements (10-2880 for electric, 3-61 for magnetic) in the 0.35-1.50 THz range.
- Core volume fraction and temperature critically influence enhancements, especially in the 1.5-2 THz window.
Conclusions:
- Electric and magnetic hotspots in InSb microsphere assemblies provide a promising platform for enhancing light-matter interactions in the THz regime.
- The tunability of these hotspots allows for tailored field enhancement at specific frequencies relevant to molecular transitions.
- These findings suggest potential applications in advanced THz absorption and circular dichroism spectroscopy techniques.
Related Concept Videos
01:15Thin-Walled Hollow Shafts
559
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
559
03:00Self-Evaluation: Self-Enhancement and Self-Verification
5.8K
Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
5.8K
03:02Colors and Magnetism
14.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.1K
01:13Finding Electric Potential From Electric Field
5.5K
For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
5.5K
01:16Bioavailability Enhancement: Drug Solubility Enhancement
255
Body:Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...
255
01:12Determining Electric Field From Electric Potential
5.0K
The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
5.0K