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Potential Due to a Polarized Object

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Reverse surface-polariton cherenkov radiation.

Jin Tao¹, Qi Jie Wang¹, Jingjing Zhang¹

¹School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore.

Scientific Reports

|August 2, 2016

Summary

This summary is machine-generated.

Researchers analytically demonstrated reverse Cherenkov radiation for surface plasmons. This phenomenon, observed in metal-insulator-metal waveguides, allows Cherenkov radiation direction to be controlled by waveguide thickness, enabling new plasmonic applications.

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Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Cherenkov radiation is typically a forward-propagating phenomenon.
Surface plasmon polaritons (SPPs) are electromagnetic waves confined to the interface between a conductor and a dielectric.

Purpose of the Study:

To analytically demonstrate the existence of reverse Cherenkov radiation for SPPs.
To investigate the control of Cherenkov radiation direction in metal-insulator-metal (MIM) waveguides.

Main Methods:

Analytical demonstration of reverse Cherenkov radiation.
Numerical calculations in both frequency and time domains.
Investigation of SPPs excited by a fast-moving electron in MIM waveguides.

Main Results:

Demonstrated that SPPs excited by an electron can generate Cherenkov radiation.
Showed that the radiation can be switched from forward to reverse direction by tuning the waveguide core thickness.
Achieved a backward-pointing radiation cone with energy flow opposite to the SPP wave vector at small core widths.

Conclusions:

The study confirms the feasibility of generating and steering electron radiation in simple plasmonic systems.
This research opens possibilities for applications like velocity-selective particle detection.