Related Experiment Video
Updated: May 24, 2026
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
Electrical beam steering with metal-anisotropic-metal structure.
Mohsen Bahramipanah1, Seyed Abdollah Mirtaheri, Mohammad Sadegh Abrishamian
1Department of Electrical and Computer Engineering, K N Toosi University of Technology, Tehran, Iran. mohsen_bahrami@ee.kntu.ac.ir
Optics Letters
|February 21, 2012
Summary
This study introduces a compact plasmonic beam-steering device using anisotropic materials. It achieves wide-angle steering (±27°) controlled by electric or magnetic fields, with efficiency increasing at larger angles.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Metamaterials
Background:
- Surface plasmon polaritons (SPPs) enable light manipulation at the nanoscale.
- Fabry-Perot (F-P) resonance in subwavelength structures influences optical properties.
- Anisotropic materials offer tunable optical responses.
Purpose of the Study:
- To present a compact, electrically controlled plasmonic beam-steering device.
- To investigate the modulation of beam splitting angles using external fields.
- To explore the underlying physics of SPP phase and F-P resonance for beam steering.
Main Methods:
- Numerical simulations using the finite-difference time-domain (FDTD) technique.
- Modeling of a plasmonic device composed of anisotropic material.
- Analysis of surface plasmon polariton phase shifts and F-P resonance conditions.
Main Results:
- Demonstration of a compact plasmonic beam-steering device.
- Achieved wide-angle beam steering up to ±27°.
- Observed increasing efficiency with larger steering angles.
- Modulation of the splitting angle via external electric or magnetic fields.
Conclusions:
- The proposed device offers efficient, tunable beam steering.
- The device leverages SPP phase and F-P resonance in anisotropic materials.
- Potential applications in highly integrated optical devices for miniaturization and tuning.
Related Concept Videos
01:19Deflection of a Beam
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
01:23Design of Prismatic Beams for Bending
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:17Beams with Unsymmetric Loadings
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
01:30Beams
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
01:15Deformation of a Beam under Transverse Loading
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
The insights from the bending moment diagram extend to...