Nonlinear laser absorption over a dielectric embedded with nanorods
| Autor: | Soni Sharma, A. Vijay |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Free electron model
Materials science Drift velocity Dielectric Condensed Matter Physics Laser 01 natural sciences Molecular physics Space charge Atomic and Molecular Physics and Optics 010305 fluids & plasmas law.invention 010309 optics law Electric field 0103 physical sciences Nanorod Electrical and Electronic Engineering Absorption (electromagnetic radiation) |
| Zdroj: | Laser and Particle Beams. 37:381-385 |
| ISSN: | 1469-803X 0263-0346 |
| DOI: | 10.1017/s0263034619000545 |
| Popis: | An analytical formalism of laser absorption in a nanorod embedded dielectric surface has been developed. Nanorods lie in the plane of the dielectric, in the form of a planar array. A laser, impinged on them with an electric field perpendicular to the lengths of the nanorods, imparts oscillatory velocity to nanorod electrons. As the free electrons of a nanorod are displaced, a space charge field is developed in the nanorod that exerts restoration force on the electrons and their drift velocity shows a resonance at ${\rm \omega} = {\rm \omega} _{\rm p}/\sqrt 2 $, where ωp denotes the plasma frequency of free electrons inside the nanorod. It is inhibited by collisions and nanorod expansion. At the resonance, the electrons are efficiently heated by the laser and laser energy is strongly absorbed, resulting in significant reduction in laser transmissivity. The transmissivity decreases with laser intensity. |
| Databáze: | OpenAIRE |
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