9 research outputs found
Chip-integrated plasmonic cavity-enhanced single nitrogen-vacancy center emission
High temporal stability and spin dynamics of individual nitrogen-vacancy (NV)
centers in diamond crystals make them one of the most promising quantum
emitters operating at room temperature. We demonstrate a chip-integrated
cavity-coupled emission into propagating surface plasmon polariton (SPP) modes
narrowing NV center's broad emission bandwidth with enhanced coupling
efficiency. The cavity resonator consists of two distributed Bragg mirrors that
are built at opposite sides of the coupled NV emitter and are integrated with a
dielectric-loaded SPP waveguide (DLSPPW), using electron-beam lithography of
hydrogen silsesquioxane resist deposited on silver-coated silicon substrates. A
quality factor of ~ 70 for the cavity (full width at half maximum ~ 10 nm) with
full tunability of the resonance wavelength is demonstrated. An up to 42-fold
decay rate enhancement of the spontaneous emission at the cavity resonance is
achieved, indicating high DLSPPW mode confinement
Nanoscale Nitrogen Doping in Silicon by Self-Assembled Monolayers
International audienceThis Report presents a nitrogen-doping method by chemically forming self-assembled monolayers on silicon. Van der Pauw technique, secondary-ion mass spectroscopy and low temperature Hall effect measurements are employed to characterize the nitrogen dopants. The experimental data show that the diffusion coefficient of nitrogen dopants is 3.66 × 10−15 cm2 s−1, 2 orders magnitude lower than that of phosphorus dopants in silicon. It is found that less than 1% of nitrogen dopants exhibit electrical activity. The analysis of Hall effect data at low temperatures indicates that the donor energy level for nitrogen dopants is located at 189 meV below the conduction band, consistent with the literature valu
Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide
Quantum states of light and matter can be manipulated on the nanoscale to
provide a technological resource for aiding the implementation of scalable
photonic quantum technologies [1-3]. Experimental progress relies on the
quality and efficiency of the coupling between photons and internal states of
quantum emitters [4-6]. Here we demonstrate a nanophotonic waveguide platform
with embedded quantum dots (QDs) that enables both Purcell-enhanced emission
and strong chiral coupling. The design uses slow-light effects in a glide-plane
photonic crystal waveguide with QD tuning to match the emission frequency to
the slow-light region. Simulations were used to map the chirality and Purcell
enhancement depending on the position of a dipole emitter relative to the air
holes. The highest Purcell factors and chirality occur in separate regions, but
there is still a significant area where high values of both can be obtained.
Based on this, we first demonstrate a record large radiative decay rate of 17
ns^-1 (60 ps lifetime) corresponding to a 20 fold Purcell enhancement. This was
achieved by electric-field tuning of the QD to the slow-light region and
quasi-resonant phonon-sideband excitation. We then demonstrate a 5 fold Purcell
enhancement for a dot with high degree of chiral coupling to waveguide modes,
substantially surpassing all previous measurements. Together these demonstrate
the excellent prospects for using QDs in scalable implementations of on-chip
spin-photonics relying on chiral quantum optics.Comment: 15 pages, 4 figures, 1 table. Supporting information is available
upon request to the corresponding autho
Nanofabrication of Plasmonic Circuits Containing Single Photon Sources
Nanofabrication of photonic components
based on dielectric loaded
surface plasmon polariton waveguides (DLSPPWs) excited by single nitrogen
vacancy (NV) centers in nanodiamonds is demonstrated. DLSPPW circuits
are built around NV containing nanodiamonds, which are certified to
be single-photon emitters, using electron-beam lithography of hydrogen
silsesquioxane (HSQ) resist on silver-coated silicon substrates. A
propagation length of 20 ± 5 μm for the NV single-photon
emission is measured with DLSPPWs. A 5-fold enhancement in the total
decay rate, and 58% coupling efficiency to the DLSPPW mode is achieved,
indicating significant mode confinement. Finally, we demonstrate routing
of single plasmons with DLSPPW-based directional couplers, revealing
the potential of our approach for on-chip realization of quantum-optical
networks
On-chip excitation of single germanium vacancies in nanodiamonds embedded in plasmonic waveguides
Quantum emitters: plasmonic connections The field of integrated quantum plasmonics has taken a step forward with the demonstration of on-chip coupling between a single photon source and a plasmonic waveguide. In the approach, a nanodiamond featuring a germanium vacancy (GeV) centre that emits single photons is embedded inside a plasmonic waveguide composed of a ridge of the dielectric hydrogen silsesquioxane atop a layer of silver. Green (532 nm) laser light is coupled to one end of the waveguide via a grating and propagates to the nanodiamond where it excites the GeV centre which emits a single photon that couples into the plasmon mode of the waveguide. The researchers from Denmark, Russia and France behind the work say that the long waveguide transmission lengths (33 µm) and efficient coupling (56%) achieved open new avenues for the development of chip-based quantum circuitry
Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide
AbstractQuantum states of light and matter can be manipulated on the nanoscale to provide a technological resource for aiding the implementation of scalable photonic quantum technologies. Experimental progress relies on the quality and efficiency of the coupling between photons and internal spin states of quantum emitters. Here we demonstrate a nanophotonic waveguide platform with embedded quantum dots (QDs) that enables both Purcell-enhanced emission and strong chiral coupling. The design uses slow-light effects in a glide-plane photonic crystal waveguide with QD tuning to match the emission frequency to the slow-light region. Simulations were used to map the chirality and Purcell enhancement depending on the position of a dipole emitter relative to the air holes. The highest Purcell factors and chirality occur in separate regions, but there is still a significant area where high values of both can be obtained. Based on this, we first demonstrate a record large radiative decay rate of 17 ± 2 ns−1 (60 ± 6 ps lifetime) corresponding to a 20 ± 2 fold Purcell enhancement. This was achieved by electric-field tuning of the QD to the slow-light region and quasi-resonant phonon-side band excitation. We then demonstrate a 5 ± 1 fold Purcell enhancement for a dot with high degree of chiral coupling to waveguide modes, substantially surpassing all previous measurements. Together these demonstrate the excellent prospects for using QDs in scalable implementations of on-chip spin-photonics relying on chiral quantum optics.</jats:p