Generation of a compact oscillator using self-injected piezoelectric optomechanical crystal
Aude Martin1, In`es Ghorbel1;2, Ma¨elle B´en´efice1, Rui Zhu2, Sylvain Combri´e1, R´emy Braive2;3,
Alfredo De Rossi1
1Thales Research and Technology, 1, avenue Augustin Fresnel, 91767 Palaiseau Cedex
2Centre de Nanosciences et de Nanotechnologies, CNRS, Universit´e Paris-Sud,
Universit´e Paris-Saclay, C2N, 10, Boulevard Thomas Gobert, 91120 Palaiseau, France
3 Universit´e Paris Diderot, Sorbonne Paris Cit´e, 75207 Paris Cedex 13, France
We report on the demonstration, in ambient atmospheric conditions, of an optomechanical oscillator made of InGaP. Self-sustained oscillations directly at 3 GHz are achieved with a low optical power of 47 muW and a linewidth narrowed down to 80 Hz. We report on injection locking experiments where the phase noise was reduced by 20 dB with 56 mV of input power. By introducing a delay, the phase noise could be also reduced by 20 dB via piezoelectric effect.
Keywords: Optomechanical oscillator, Photonic crystal cavity, Injection-locked oscillators, Phase noise
Subwavelength engineering for Brillouin gain optimization in silicon optomechanical waveguides
Jianhao Zhang,1 Omar Ortiz,1 Xavier Le-Roux,1 Eric Cassan,1 Laurent Vivien,1 Delphine Marris-Morini,1 Daniel Lanzillotti Kimura,1 Carlos Alonso-Ramos1
1 Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, Univ. Paris-Sud, CNRS, 91120, Palaiseau, France.
Brillouin optomechanics has recently emerged as a promising tool to implement new functionalities in silicon photonics, including high-performance opto-RF processing and non-reciprocal light propagation. One key challenge in this field is to maximize the photon-phonon interaction and the acoustic lifetime, simultaneously. Here, we propose a new strategy that exploits subwavelength engineering of the photonic and phononic modes in silicon membrane waveguides to maximize the Brillouin gain. The proposed optomechanical waveguide comprises a lattice of holes with a period in the subwavelength regime for near-infrared photons and GHz phonons. By properly designing the dimensions of the subwavelength periodic structuration, we tightly confine optical and acoustic modes, minimizing leakage losses and maximizing the Brillouin coupling. Our theoretical analysis predicts a high acoustic quality factor of up to 2000 and a remarkable Brillouin gain yielding 10000 (W∙m)−1. We believe that the proposed subwavelength-nanostructured waveguide holds a great potential for the engineering of Brillouin optomechanical interactions in silicon.
Keywords: Silicon photonics, optomechanics, nonlinear optics, subwavelength structures, Brillouin.
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