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Reversed Doppler effect in photonic crystals.
Evan J Reed1, Marin Soljacić, John D Joannopoulos
1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. evan@mit.edu
Physical Review Letters
|October 4, 2003
Summary
Scientists discovered a new way to create nonrelativistic reversed Doppler shifts using light reflected from a shock wave in a photonic crystal. This phenomenon, previously only theoretical, opens new avenues for optical research.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Wave Phenomena
Background:
- Nonrelativistic reversed Doppler shifts are theoretical, requiring exotic material properties.
- Previous observations or confirmations of such shifts in natural or artificial systems are lacking.
Purpose of the Study:
- To present a novel physical phenomenon leading to a nonrelativistic reversed Doppler shift.
- To demonstrate this effect using light interacting with a moving shock wave in a photonic crystal.
Main Methods:
- Utilizing a photonic crystal to generate and study light-matter interactions.
- Inducing a moving shock wave within the photonic crystal.
- Analyzing the reflected light spectrum from the shock wave under single-frequency (1 microm wavelength) incidence.
Main Results:
- Observed a nonrelativistic reversed Doppler shift in reflected light.
- Demonstrated the possibility of multiple discrete reflected frequencies.
- Showcased a 10 GHz periodic modulation in the reflected signal.
Conclusions:
- A new physical mechanism for nonrelativistic reversed Doppler shifts has been experimentally demonstrated.
- Photonic crystals provide a viable platform for observing this effect.
- The phenomenon allows for complex spectral modifications of incident light.