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Achieving centimetre-scale supercollimation in a large-area two-dimensional photonic crystal
Peter T Rakich1, Marcus S Dahlem, Sheila Tandon
1rakich@mit.edu
Nature Materials
|January 18, 2006
Summary
Scientists achieved supercollimation, making light beams propagate without spreading in photonic crystals (PhCs). This phenomenon shows robustness against disorder, enabling stable light propagation over long distances.
Area of Science:
- Physics
- Optics
- Materials Science
Background:
- Diffraction causes optical beams to spread during propagation.
- Photonic crystals (PhCs) offer engineered anisotropy for novel light manipulation.
- Supercollimation, the apparent absence of diffraction, has been observed in PhCs over short distances.
Purpose of the Study:
- To demonstrate and investigate supercollimation in a macroscopic photonic crystal system.
- To assess the robustness of supercollimation against fabrication disorder over extended propagation lengths.
- To explore potential applications such as supercollimation steering.
Main Methods:
- Experiments conducted on a macroscopic two-dimensional photonic crystal.
- Quantitative studies of light beam evolution within the PhC.
- Rigorous simulations to understand the effects of disorder.
Main Results:
- Supercollimation demonstrated over centimetre-scale distances in a macroscopic PhC.
- Spatial width confinement of light beams maintained without waveguides or nonlinearities.
- Supercollimation exhibited inherent robustness against short-scale disorder, extending over 600 isotropic diffraction-lengths.
Conclusions:
- Supercollimation is achievable and robust in macroscopic PhC systems.
- Fabrication disorder does not significantly impede supercollimation over extended ranges.
- The findings pave the way for practical applications, including controlled steering of light beams.
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