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Coherent optical photons from shock waves in crystals
Evan J Reed1, Marin Soljacić, Richard Gee
1Center for Materials Science and Engineering and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. reed23@llnl.gov
Physical Review Letters
|February 21, 2006
Summary
Scientists predict a new source of coherent optical radiation using shock waves in crystals. This method generates terahertz (THz) radiation via synchronized atomic motion, distinct from lasers.
Area of Science:
- Solid-state physics
- Optics
- Materials science
Background:
- Existing coherent optical radiation sources include lasers and free-electron lasers.
- Shock waves and soliton-like excitations can induce significant material responses.
Purpose of the Study:
- To predict and theoretically investigate a novel method for generating coherent electromagnetic radiation.
- To explore the potential of using shock-induced atomic motion for new radiation sources.
Main Methods:
- Development of a general analytical theory for shock-induced radiation.
- Molecular dynamics simulations using sodium chloride (NaCl) as a model crystalline material.
Main Results:
- Prediction of coherent electromagnetic radiation generation in the 1-100 THz frequency range.
- Demonstration of coherence lengths on the order of millimeters at approximately 20 THz.
- Identification of emission frequencies being dependent on shock speed and crystal lattice constants.
Conclusions:
- Coherent optical radiation can be generated in crystalline materials via shock wave propagation.
- This phenomenon represents a fundamentally new class of coherent optical radiation source.
- The generated radiation properties may offer a novel method for probing atomic-scale material characteristics.