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Updated: Aug 26, 2025
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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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Luminous, relativistic, directional electron bunches from an intense laser driven grating plasma
Amit D Lad1, Y Mishima2, Prashant Kumar Singh1
1Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Colaba, Mumbai, 400005, India.
Scientific Reports
|October 7, 2022
Summary
Relativistic intense laser pulses interacting with grating targets under surface plasmon resonance (SPR) conditions efficiently generate bright, energetic electron bunches. This SPR mechanism enhances electron flux and temperature, offering a pathway for creating multiple ultrafast electron sources.
Area of Science:
- Plasma physics
- Laser-matter interactions
- Nanophotonics
Background:
- High-intensity lasers enable novel particle acceleration methods.
- Surface plasmon resonance (SPR) can enhance light-matter interactions.
- Grating targets offer unique electromagnetic field confinement.
Purpose of the Study:
- To investigate the generation of electron bunches using intense laser pulses on grating targets under SPR conditions.
- To analyze the characteristics and enhancement of electron flux and temperature.
- To explore the underlying mechanisms of electron emission directionality.
Main Methods:
- Interaction of relativistic intense laser pulses (10^19 W/cm^2, 30 fs, 800 nm) with grating targets (500 and 1000 lines/mm).
- Experimental observation of electron bunch generation and properties.
- Particle-in-Cell (PIC) simulations to model electron emission dynamics.
Main Results:
- Efficient generation of bright, energetic, and directional electron bunches.
- Observation of bi-directional electron bunches (40° and 150°) from 500 lines/mm gratings under SPR.
- SPR excitation enhanced electron flux by 6.0x and temperature by 3.6x compared to plane substrates.
- PIC simulations linked electron emission directionality to surface magnetic field evolution.
Conclusions:
- Surface plasmon resonance on grating targets is an effective method for generating ultrafast relativistic electron bunches.
- The SPR mechanism significantly enhances electron flux and temperature.
- This approach provides a route for developing multiple, bright electron sources for diverse applications.
