Phononic Frequency Comb via Intrinsic Three-Wave Mixing
Physical Review Letters
American Physical Society
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Ganesan, A., Do, C., & Seshia, A. (2017). Phononic Frequency Comb via Intrinsic Three-Wave Mixing. Physical Review Letters, 118 (033903) https://doi.org/10.1103/PhysRevLett.118.033903
Optical frequency combs [1-8] have resulted in significant advances in optical frequency metrology and found wide application to precise physical measurements [1-4, 9] and molecular fingerprinting . A direct analogue of frequency combs in the phononic or acoustic domain has not been reported to date. In this letter, we report the first clear experimental evidence for a phononic frequency comb. In contrast to the Kerr nonlinearity  in optical frequency comb formation, the phononic frequency comb is generated through the intrinsic coupling of a driven phonon mode with an auto-parametrically excited sub-harmonic mode . Through systematic experiments at different drive frequencies and amplitudes, we portray the well-connected process of phononic frequency comb formation and define attributes to control the features [17-18] associated with comb formation in such a system. Further, the interplay between these nonlinear resonances and the well-known Duffing phenomenon [12-14] is also observed. The presented pathway for phononic frequency comb formation finds general relevance to other nonlinear systems in both classical and quantum domains.
External DOI: https://doi.org/10.1103/PhysRevLett.118.033903
This record's URL: https://www.repository.cam.ac.uk/handle/1810/288223