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Phase mismatch-free nonlinear propagation in optical zero-index materials
Haim Suchowski1, Kevin O'Brien, Zi Jing Wong
1NSF Nanoscale Science and Engineering Center, University of California, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|December 7, 2013
Summary
Researchers achieved phase mismatch-free nonlinear generation in a zero-index optical metamaterial. This breakthrough eliminates the need for phase matching, enabling efficient nonlinear optical processes and enabling new applications.
Area of Science:
- Nonlinear Optics
- Metamaterials
- Quantum Optics
Background:
- Phase matching is essential for efficient nonlinear optical processes like frequency conversion.
- Phase mismatch leads to destructive interference and low efficiency in conventional materials.
Purpose of the Study:
- To experimentally demonstrate phase mismatch-free nonlinear generation.
- To explore the potential of zero-index metamaterials for enhanced nonlinear optics.
Main Methods:
- Utilizing a zero-index optical metamaterial.
- Employing intrapulse four-wave mixing for nonlinear generation.
Main Results:
- Achieved efficient nonlinear generation without phase matching requirements.
- Observed a forward-to-backward nonlinear emission ratio close to unity.
Conclusions:
- Zero-index metamaterials enable phase mismatch-free nonlinear optical processes.
- This advancement opens possibilities for multidirectional frequency conversion and entangled photon generation.
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