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Photonic crystal membranes (PCM) provide a versatile planar platform foron-chip implementations of photonic quantum circuits. One prominent quantumelement is a coupled system consisting of a nanocavity and a single quantum dot(QD) which forms a fundamental building block for elaborate quantum informationnetworks and a cavity quantum electrodynamic (cQED) system controlled by singlephotons. So far no fast tuning mechanism is available to achieve control withinthe system coherence time. Here we demonstrate dynamic tuning by monochromaticcoherent acoustic phonons formed by a surface acoustic wave (SAW) withfrequencies exceeding 1.7 gigahertz, one order of magnitude faster thanalternative approaches. We resolve a periodic modulation of the optical modeexceeding eight times its linewidth, preserving both the spatial mode profileand a high quality factor. Since PCMs confine photonic and phononicexcitations, coupling optical to acoustic frequencies, our technique opens waystowards coherent acoustic control of optomechanical crystals.

Dynamic modulation of photonic crystal nanocavities using gigahertz acoustic phonons