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Quasi-phase-matched backward second-harmonic generation by complementary media in nonlinear metamaterials
Li Quan1, Xiaozhou Liu, Xiufen Gong
1Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, People's Republic of China.
The Journal of the Acoustical Society of America
|October 9, 2012
Summary
This study introduces a new quasi-phase-matching (QPM) method for acoustic metamaterials using nonlinear complementary media. This approach enables efficient backward second-harmonic generation with a broader bandwidth, applicable to both acoustic and electromagnetic waves.
Area of Science:
- Acoustics
- Metamaterials
- Nonlinear Optics
- Wave Phenomena
Background:
- Quasi-phase-matching (QPM) is effective for nonlinear frequency generation in optical superlattices.
- Applying QPM to acoustic waves is challenging due to the rarity of media with negative nonlinear parameters.
- QPM in acoustic metamaterials remains an under-explored area.
Purpose of the Study:
- To develop a protocol for implementing quasi-phase-matching in acoustic metamaterials.
- To achieve efficient backward second-harmonic generation using nonlinear complementary media.
- To broaden the applicability of QPM methods beyond conventional optics.
Main Methods:
- Utilizing nonlinear complementary media within acoustic metamaterials.
- Implementing a novel protocol for quasi-phase-matching in acoustics.
- Investigating backward second-harmonic generation.
Main Results:
- Demonstrated a protocol for quasi-phase-matching in acoustic metamaterials.
- Achieved large backward second-harmonic generation.
- The proposed method offers a broader bandwidth compared to conventional techniques.
Conclusions:
- The developed QPM protocol using nonlinear complementary media is effective for acoustic metamaterials.
- This method facilitates efficient backward second-harmonic generation.
- The protocol shows potential for application in both acoustic and electromagnetic wave systems, offering enhanced bandwidth.
