Related Experiment Video
Updated: May 3, 2026
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
16.4K
Efficient coupling between dielectric waveguide modes and exterior plasmon whispering gallery modes.
Optics Express
|February 12, 2014
Summary
Researchers improved coupling between dielectric waveguide modes and plasmon modes using novel waveguide designs. These advancements enhance efficiency for integrated optical devices and sensors.
Area of Science:
- Photonics
- Plasmonics
- Optical Engineering
Background:
- Inefficient coupling between dielectric guided modes and plasmon modes has been a past challenge.
- The coupling mechanism differs significantly from conventional dielectric mode coupling.
Purpose of the Study:
- To propose and theoretically analyze methods for strengthening the coupling between dielectric waveguide modes and exterior plasmon whispering gallery modes.
- To overcome limitations in current integrated optical device and sensor technologies.
Main Methods:
- Qualitative theoretical analysis.
- Designing a U-shaped bent waveguide to disrupt adiabatic mode conversion.
- Utilizing higher-order dielectric modes for phase matching with plasmon modes.
Main Results:
- Demonstrated significantly improved coupling efficiency through transmission spectrum analysis of waveguides.
- Validated enhanced coupling via energy spectrum analysis of cavities.
- Proposed simple configurations with potential for wide applications.
Conclusions:
- The proposed methods effectively enhance coupling efficiency between dielectric and plasmon modes.
- These configurations offer a pathway for developing advanced tunable integrated optical devices and sensors.
Related Concept Videos
01:28Standing Waves in a Cavity
1.7K
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:
1.7K
01:31Dielectric Polarization in a Capacitor
5.5K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.5K
01:26Susceptibility, Permittivity and Dielectric Constant
3.6K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
3.6K
01:27Electrostatic Boundary Conditions in Dielectrics
2.1K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
2.1K
01:18Capacitor With A Dielectric
4.3K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.3K
01:30Electromagnetic Waves in Matter
2.8K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium,...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium,...
2.8K