97 research outputs found
Quantum gate for Q switching in monolithic photonic bandgap cavities containing two-level atoms
Photonic bandgap cavities are prime solid-state systems to investigate
light-matter interactions in the strong coupling regime. However, as the cavity
is defined by the geometry of the periodic dielectric pattern, cavity control
in a monolithic structure can be problematic. Thus, either the state coherence
is limited by the read-out channel, or in a high Q cavity, it is nearly
decoupled from the external world, making measurement of the state extremely
challenging. We present here a method for ameliorating these difficulties by
using a coupled cavity arrangement, where one cavity acts as a switch for the
other cavity, tuned by control of the atomic transition.Comment: 6 pages, 5 figures, 1 tabl
Conformal Nanocarbon Coating of Alumina Nanocrystals for Biosensing and Bioimaging
A conformal coating technique with nanocarbon was developed to enhance the
surface properties of alumina nanoparticles for bio-applications. The
ultra-thin carbon layer induces new surface properties such as water
dispersion, cytocompatibility and tuneable surface chemistry, while maintaining
the optical properties of the core particle. The possibility of using these
particles as agents for DNA sensing was demonstrated in a competitive assay.
Additionally, the inherent fluorescence of the core alumina particles provided
a unique platform for localization and monitoring of living organisms, allowing
simultaneous cell monitoring and intra-cellular sensing. Nanoparticles were
able to carry genes to the cells and release them in an environment where
specific biomarkers were present.Comment: 11 pages, 5 figures, Supporting Informatio
Low temperature transport on surface conducting diamond
Magneto-transport measurements were performed on surface conducting
hydrogen-terminated diamond (100) hall bars at temperatures between 0.1-5 K in
magnetic fields up to 8T.Comment: 2 pages Optoelectronic and Microelectronic Materials & Devices
(COMMAD), 2012 Conferenc
Chromium single photon emitters in diamond fabricated by ion implantation
Controlled fabrication and identification of bright single photon emitters is
at the heart of quantum optics and materials science. Here we demonstrate a
controlled engineering of a chromium bright single photon source in bulk
diamond by ion implantation. The Cr center has fully polarized emission with a
ZPL centered at 749 nm, FWHM of 4 nm, an extremely short lifetime of ~1 ns, and
a count rate of 500 kcounts/s. By combining the polarization measurements and
the vibronic spectra, a model of the center has been proposed consisting of one
interstitial chromium atom with a transition dipole along one of the
directions
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