Gigahertz acoustic waves for integration of optomechanical oscillators (Conference Presentation)

Giuseppe Modica; Rui Zhu; Remy Braive

doi:10.1117/12.2557367

2 April 2020 Gigahertz acoustic waves for integration of optomechanical oscillators (Conference Presentation)

Giuseppe Modica, Rui Zhu, Remy Braive

Proceedings Volume 11364, Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications; 113640Z (2020) https://doi.org/10.1117/12.2557367
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

Combining acoustic waves and optomechanical resonators could lead to a new generation of ultra-stable optomechanical oscillators with high-spectral purity and low phase noise signals directly at the frequency of interest. Moreover, this approach would allow an easy on-chip integration at μm scale, where the lack of good quality and miniaturized source is a severe issue. The resonator part of such a system will be made of a 1D photonic crystal nanobeam suspended over a silicon waveguide, sustaining optical modes around 1.55 μm and mechanical modes around a few GHz. On the other hand, Interdigital transducers (IDT) will provide acoustic waves in the GHz allowing a full mechanical control of the oscillating structure. In addition, phononic waveguides can be designed to engineer the acoustic velocity of the mechanical propagating modes in order to achieve the desired delay for a correct stabilization of the oscillations. The proposed system can be then exploited for potential on-board applications such as navigation and telecommunication systems, metrology or sensing. Design, simulation, fabrication and experimental results of resonant mechanical excitation in the GHz will be discussed, with particular emphasis on the time-domain studies of the propagating acoustic waves, where a specific time-gating technique is needed in order to properly extrapolate the delay information.

Conference Presentation

Citation Download Citation

Giuseppe Modica, Rui Zhu, and Remy Braive "Gigahertz acoustic waves for integration of optomechanical oscillators (Conference Presentation)", Proc. SPIE 11364, Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications, 113640Z (2 April 2020); https://doi.org/10.1117/12.2557367

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KEYWORDS

Acoustics

Oscillators

Navigation systems

Resonators

Sensing systems

Wave propagation

Waveguides

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