17 research outputs found
Microwave Photonic Characterization of High Temperature Superconducting Optoelectronic Devices
The increasing demand for high performance communications systems and signal processing is constantly driving researchers to develop novel devices in both the microwave and optical domains. The possibility of using high temperature superconductors (HTS) as a platform for ultra-fast, ultra-high sensitive optoelectronic and microwave photonic devices has been explored.
This report introduces a cryogenic microwave photonic probe station, designed and built to characterize HTS microwave photonic devices. A methodology is presented to design coplanar waveguide transmission lines using HTS. The transmission line is then modified to include a meander line structure to serve the optoelectronic function. The device is characterized in several different operating domains, as an optically tunable microwave resonator, an optically tunable delay line, and finally as a photodetector.
A planar HTS weak leak structure is investigated with the measurements of the I-V characteristics. Moreover, this device is proposed as the next generation platform to fabricate ultra-fast and ultra-high sensitive photodetectors using HTS
Efficient Single Photon Absorption by Optimized Superconducting Nanowire Geometries
We report on simulation results that shows optimum photon absorption by
superconducting nanowires can happen at a fill-factor that is much less than
100%. We also present experimental results on high performance of our
superconducting nanowire single photon detectors realized using NbTiN on
oxidized silicon.Comment: \copyright 2013 IEEE. Submitted to "Numerical Simulation of
Optoelectronic Devices - NUSOD 2013" on 19-April-201
Diamond optomechanical crystals
Cavity-optomechanical systems realized in single-crystal diamond are poised
to benefit from its extraordinary material properties, including low mechanical
dissipation and a wide optical transparency window. Diamond is also rich in
optically active defects, such as the nitrogen-vacancy (NV) and silicon-vacancy
(SiV) centers, which behave as atom-like systems in the solid state.
Predictions and observations of coherent coupling of the NV electronic spin to
phonons via lattice strain has motivated the development of diamond
nanomechanical devices aimed at realization of hybrid quantum systems, in which
phonons provide an interface with diamond spins. In this work, we demonstrate
diamond optomechanical crystals (OMCs), a device platform to enable such
applications, wherein the co-localization of ~ 200 THz photons and few to 10
GHz phonons in a quasi-periodic diamond nanostructure leads to coupling of an
optical cavity field to a mechanical mode via radiation pressure. In contrast
to other material systems, diamond OMCs operating in the resolved-sideband
regime possess large intracavity photon capacity (> 10) and sufficient
optomechanical coupling rates to reach a cooperativity of ~ 20 at room
temperature, allowing for the observation of optomechanically induced
transparency and the realization of large amplitude optomechanical
self-oscillations
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Diamond optomechanical crystals
Cavity-optomechanical systems realized in single-crystal diamond are poised to benefit from its extraordinary material properties, including low mechanical dissipation and wide optical transparency window. Diamond is also rich in optically active defects, such as the nitrogen-vacancy (NV) center, which behave as atom-like systems in the solid state. Predictions and observations of coherent coupling of the NV electronic spin to phonons via lattice strain has motivated the development of diamond nanomechanical devices aimed at realization of hybrid quantum systems, in which phonons provide an interface with diamond spins. In this work, we demonstrate a device platform to enable such applications: diamond optomechanical crystals (OMCs), where the co-localization of ~ 200 THz photons and ~ 6 GHz phonons in a quasi-periodic diamond nanostructure leads to coupling of an optical cavity field to a mechanical mode via the radiation pressure of light. In contrast to other material systems, diamond OMCs operating in the resolved sideband regime possess large intracavity photon capacity (> 105) and sufficient optomechanical coupling rate to exceed a cooperativity of ~ 1 at room temperature and realize large amplitude optomechanical self-oscillations. Strain-mediated coupling of the high frequency (~ GHz) mechanical modes of these devices to the electronic and spin levels of diamond color centers has the potential to reach the strong spin-phonon coupling regime, and enable a coherent interface with diamond qubits for applications in quantum-nonlinear optomechanics.Physic
Quantum interference of electromechanically stabilized emitters in nanophotonic devices
Photon-mediated coupling between distant matter qubits may enable secure
communication over long distances, the implementation of distributed quantum
computing schemes, and the exploration of new regimes of many-body quantum
dynamics. Nanophotonic devices coupled to solid-state quantum emitters
represent a promising approach towards realization of these goals, as they
combine strong light-matter interaction and high photon collection
efficiencies. However, the scalability of these approaches is limited by the
frequency mismatch between solid-state emitters and the instability of their
optical transitions. Here we present a nano-electromechanical platform for
stabilization and tuning of optical transitions of silicon-vacancy (SiV) color
centers in diamond nanophotonic devices by dynamically controlling their strain
environments. This strain-based tuning scheme has sufficient range and
bandwidth to alleviate the spectral mismatch between individual SiV centers.
Using strain, we ensure overlap between color center optical transitions and
observe an entangled superradiant state by measuring correlations of photons
collected from the diamond waveguide. This platform for tuning spectrally
stable color centers in nanophotonic waveguides and resonators constitutes an
important step towards a scalable quantum network
Strain engineering of the silicon-vacancy center in diamond
We control the electronic structure of the silicon-vacancy (SiV) color-center in diamond by changing its static strain environment with a nano-electro-mechanical system. This allows deterministic and local tuning of SiV optical and spin transition frequencies over a wide range, an essential step towards multiqubit networks. In the process, we infer the strain Hamiltonian of the SiV revealing large strain susceptibilities of order 1 PHz/strain for the electronic orbital states. We identify regimes where the spin-orbit interaction results in a large strain susceptibility of order 100 THz/strain for spin transitions, and propose an experiment where the SiV spin is strongly coupled to a nanomechanical resonator