2,477 research outputs found
Butterworth Pattern-based Simultaneous Damping and Tracking Controller Designs for Nanopositioning Systems
Peer reviewedPublisher PD
A robust loop-shaping approach to fast and accurate nanopositioning
Peer reviewedPreprin
An analytical approach to integral resonant control of second-order systems
Peer reviewedPostprin
A Modified Positive Velocity and Position Feedback scheme with delay compensation for improved nanopositioning performance
Acknowledgments This paper was sponsored by the Spanish FPU12/00984 Program (Ministerio de Educacion, Cultura y Deporte). It was also sponsored by the Spanish Government Research Program with the Project DPI2012-37062-CO2-01 (Ministerio de Economia y Competitividad) and by the European Social Fund.Peer reviewedPostprin
Deterministic nano-assembly of a coupled quantum emitter - photonic crystal cavity system
The interaction of a single quantum emitter with its environment is a central
theme in quantum optics. When placed in highly confined optical fields, such as
those created in optical cavities or plasmonic structures, the optical
properties of the emitter can change drastically. In particular, photonic
crystal (PC) cavities show high quality factors combined with an extremely
small mode volume. Efficiently coupling a single quantum emitter to a PC cavity
is challenging because of the required positioning accuracy. Here, we
demonstrate deterministic coupling of single Nitrogen-Vacancy (NV) centers to
high-quality gallium phosphide PC cavities, by deterministically positioning
their 50 nm-sized host nanocrystals into the cavity mode maximum with
few-nanometer accuracy. The coupling results in a 25-fold enhancement of NV
center emission at the cavity wavelength. With this technique, the NV center
photoluminescence spectrum can be reshaped allowing for efficient generation of
coherent photons, providing new opportunities for quantum science.Comment: 13 pages, 4 figure
Optimal integral force feedback and structured PI tracking control : application for objective lens positioner
Peer reviewedPostprin
Low-noise high-voltage DC power supply for nanopositioning applications
Nanopositioning techniques currently applied to characterize physical
properties of materials interesting for applications at the microscopic scale
rely on high-voltage electronic control circuits that should have the lowest
possible noise level. Here we introduce a simple, flexible, and custom-built
power supply circuit that can provide +375\,V with a noise level below 10\,ppm.
The flexibility of the circuit comes from its topology based on discrete MOSFET
components that can be suitable replaced in order to change the polarity as
well as the output voltage and current.Comment: 3 pages, 2 figure
Application of a Fractional Order Integral Resonant Control to increase the achievable bandwidth of a nanopositioner
The congress program will essentially include papers selected on the highest standard by the IPC, according to the IFAC guidelines www.ifac-control.org/publications/Publications-requirements-1.4.pdf, and published in open access in partnership with Elsevier in the IFAC-PapersOnline series, hosted on the ScienceDirect platform www.sciencedirect.com/science/journal/24058963. Survey papers overviewing a research topic are also most welcome. Contributed papers will have usual 6 pages length limitation. 12 pages limitation will apply to survey papers.Publisher PD
All-Optical Nanopositioning of High-Q Silica Microspheres
A tunable, all-optical, coupling method has been realized for a
high-\textit{Q} silica microsphere and an optical waveguide. By means of a
novel optical nanopositioning method, induced thermal expansion of an
asymmetric microsphere stem for laser powers up to 171~mW has been observed and
used to fine tune the microsphere-waveguide coupling. Microcavity displacements
ranging from (0.612~~0.13) -- (1.5 0.13) m and nanometer scale
sensitivities varying from (2.81 0.08) -- (7.39 0.17) nm/mW, with
an apparent linear dependency of coupling distance on stem laser heating, were
obtained. Using this method, the coupling was altered such that different
coupling regimes could be explored for particular samples. This tunable
coupling method, in principle, could be incorporated into lab-on-a-chip
microresonator systems, photonic molecule systems, and other nanopositioning
frameworks.Comment: 6pages,4figure
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