2,045 research outputs found
Deterministic design of wavelength scale, ultra-high Q photonic crystal nanobeam cavities
Photonic crystal nanobeam cavities are versatile platforms of interest for
optical communications, optomechanics, optofluidics, cavity QED, etc. In a
previous work \cite{quan10}, we proposed a deterministic method to achieve
ultrahigh \emph{Q} cavities. This follow-up work provides systematic analysis
and verifications of the deterministic design recipe and further extends the
discussion to air-mode cavities. We demonstrate designs of dielectric-mode and
air-mode cavities with , as well as cavities with both high-\emph{Q}
() and high on-resonance transmissions ()
An all-silicon single-photon source by unconventional photon blockade
The lack of suitable quantum emitters in silicon and silicon-based materials
has prevented the realization of room temperature, compact, stable, and
integrated sources of single photons in a scalable on-chip architecture, so
far. Current approaches rely on exploiting the enhanced optical nonlinearity of
silicon through light confinement or slow-light propagation, and are based on
parametric processes that typically require substantial input energy and
spatial footprint to reach a reasonable output yield. Here we propose an
alternative all-silicon device that employs a different paradigm, namely the
interplay between quantum interference and the third-order intrinsic
nonlinearity in a system of two coupled optical cavities. This unconventional
photon blockade allows to produce antibunched radiation at extremely low input
powers. We demonstrate a reliable protocol to operate this mechanism under
pulsed optical excitation, as required for device applications, thus
implementing a true single-photon source. We finally propose a state-of-art
implementation in a standard silicon-based photonic crystal integrated circuit
that outperforms existing parametric devices either in input power or footprint
area.Comment: 5 pages, 3 figures + Supplementary information (3 pages, 2 figures
Highly efficient coupling between a monolithically integrated photonic crystal cavity and a bus waveguide
We experimentally demonstrate a new optical filter design comprising of a photonic crystal cavity and a low index bus waveguide which are monolithically integrated on a silicon-on-insulator (SOI) platform. We have fabricated oxide clad PhC cavities with a silicon nitride waveguide positioned directly above, such that there is an overlap between the evanescent tails of the two modes. We have realised an extinction ratio of 7.5dB for cavities with total Q of 50,000.Postprin
Quantum dot-photonic crystal chips for quantum information processing
We have recently developed a technique for local, reversible tuning of individual quantum dots on a photonic crystal chip by up to 1.8nm, which overcomes the problem of large quantum dot inhomogeneous broadening - usually considered the main obstacle in employing such platform in practical quantum information processing systems. We have then used this technique to tune single quantum dots into strong coupling with a photonic crystal cavity, and observed strong coupling both in photoluminescence and in resonant light scattering from the system, as needed for several proposals for scalable quantum information networks and quantum computation
Proposal for an Optomechanical Traveling Wave Phonon-Photon Translator
In this article we describe a general optomechanical system for converting
photons to phonons in an efficient, and reversible manner. We analyze
classically and quantum mechanically the conversion process and proceed to a
more concrete description of a phonon-photon translator formed from coupled
photonic and phononic crystal planar circuits. Applications of the
phonon-photon translator to RF-microwave photonics and circuit QED, including
proposals utilizing this system for optical wavelength conversion, long-lived
quantum memory and state transfer from optical to superconducting qubits are
considered.Comment: 32 pages, 11 figure
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