We discuss a compact QED system of Germanium Vacancy(GeV) centres coupled to high quality factor silicon nitride nanobeam Photonic crystal(PhC) cavities. Devices with a quality factor of 24,000 around the zero-phonon line of the GeV center in diamond are demonstrated with an efficient fiber-to-waveguide coupling platform. We also present a method for fiber-waveguide coupling that allows seamless transition of photons from optical fibers into photonics devices and vice versa. Our method uses conical tapered optical fibers (with a tapering angle of ∼ 4° ) that are coupled over ∼ 11μm to a silicon nitride (Si3N4) waveguide taper (with a tapering angle of ∼ 1° ) achieving upto ∼ 96% coupling efficiency.
KEYWORDS: Color centers, Solid state electronics, Photonic crystals, Quantum information processing, Quantum communications, Diamond, Nanostructures, Light emitting diodes, Quantum efficiency, Chemical species
Development of quantum information processing requires realization of solid state structures able to manipulate light or matter quantum bits. One of the promising candidates for been active elements of such solid-state platform are color centers in diamond. The most famous nitrogen-vacancy color center has number of attractive features and found a lot of applications in sensing and imaging. Still, it has number of considerable disadvantages, among which it sensitivity to the surface damages and thus its incompatibility with nanostructures. On another side implementation of nano- and micro- structures enabled considerable progress in manipulation of light quanta. In particular photonic crystal cavities allowed to realize strong coupling of cavity and spin system. This led to demonstration of efficient light collection and realization of simple quantum gates with artificial or real atoms.
Novel color centers such as silicon-vacancy or germanium-vacancy color center due to inversion symmetry of the electron structure are not sensitive to the surface damages and presence of surface nearby. Thus, those are perfect candidates for been combined with photonic crystal structures. Novel technologies enabled growing of the nanodiamonds of ultra-small size having well-defined color center inside. Along with techniques to position those precisely on the nano- and micro structures these achievements opened opportunity to integrate high-fines photonic-crystal cavities with the germanium-vacancy containing nanocrystals thus forming fully solid-state platform for quantum manipulation of light. In my talk I will describe our progress towards realization of this ambitious goal.
Living cells are likely to change their internal temperature during such natural processes as division, gene expression etc. Additionally, they actively react to environmental changes in temperature. Therefore, monitoring of intracell or near cell temperature opens the door for understanding intra-cell chemistry. However, most biological temperature changes expected be relatively small and transient, due to interactions with its environment. Hence, detecting this temperature change is quite challenging.
We present the first systematic study of GeV spectra temperature shits on several different samples all demonstrating similar behavior. This temperature shits of zero-phonon line of GeV color center is powerful tool for precise all-optical detection of the temperature. Based on these studies we demonstrate all-optical thermometry with resolution well below 0.1K. Spatial resolution was demonstrated via implementation of the fiber based probe. Besides, we conducted series of proof of principal experiments in pillars and nanodiamonds this way proving possibility to measure temperature with submicron resolution. Achieved resolution together with chemical and physical inertness of nanodiamond passes the way for understanding of thermal function of living organisms and cells.
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