A time gating technique based on Four Wave Mixing was developed to measure for the first time the temporal profile of a 1D PhC nanolaser operating in the telecom range at room temperature. Our method enabled a resolution of 1 ps and a detection sensitivity of 200 nW peak power. Our results show a build-up time of the emission of around 30ps and a decay time of 35ps. This shows the potential of these nanolasers for encoding data at a high bit rate (15 GHz).
We present a one dimensional photonic crystal, made of Gallium-Phosphide, as an optomechanical oscillator with low phase noise. The heterogenous integration on Silicon-on-Insulator circuitry allows the evanescently coupling of light at telecom wavelengths from the silicon waveguides into the photonic wire crystal. Thanks to the strong interaction between the optical field and mechanical field, the mechanical oscillation at 3.35 GHz is directly imprinted on the optical carrier. An external opto-electronic feedback loop with time-delay is constructed to further stabilize the oscillation. We achieved a phase noise of -111dBc/Hz at 100 kHz offset frequency with sub-Hz linewidth of 0.67 Hz.
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.
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