Related Experiment Video
Updated: Nov 23, 2025
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
17.3K
Controllable intermodal coupling in waveguide systems based on tunable hyperbolic metamaterials.
Optics Express
|December 31, 2020
Summary
This study explores intermodal coupling in a novel waveguide system. Researchers demonstrate controlled power exchange between dielectric and graphene-based metamaterial waveguides by tuning graphene
Area of Science:
- Optics and Photonics
- Materials Science
- Condensed Matter Physics
Background:
- Intermodal coupling is crucial for manipulating light in waveguide systems.
- Graphene-based hyperbolic metamaterials offer tunable electromagnetic properties.
- Previous research has not explored coupling between dielectric and graphene hyperbolic metamaterial waveguides.
Purpose of the Study:
- To investigate intermodal coupling in a hybrid dielectric-metamaterial waveguide system.
- To demonstrate tunable power exchange between waveguide modes using graphene.
- To analyze the influence of system parameters on coupling strength.
Main Methods:
- Derivation of coupled mode equations using the Lorentz reciprocity theorem.
- Numerical analysis of power exchange between transverse magnetic (TM) modes.
- System parameter variation (waveguide width, separation distance, Fermi potential).
Main Results:
- Demonstrated fully controlled power exchange between dielectric waveguide TM modes and both forward and backward TM modes of the graphene hyperbolic metamaterial waveguide.
- Showcased tunability of power exchange by adjusting the Fermi potential of graphene.
- Identified waveguide width and separation distance as key factors influencing coupling strength.
Conclusions:
- The proposed hybrid waveguide system enables unprecedented control over intermodal power transfer.
- Graphene's tunable properties are key to achieving dynamic control of light propagation.
- This work lays the foundation for novel photonic devices utilizing coupled dielectric and metamaterial waveguides.
Related Concept Videos
01:28Standing Waves in a Cavity
1.2K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.2K
01:07Propagation of Waves
2.6K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.6K
01:23Transmission Line Design Considerations
447
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
447