Integrated quantum photonics relies critically on photon sources that have great purity, single-mode property, scalability, integrability and flexibility for both integrated quantum computing and long-haul quantum communication. Here we report a photon-pair/single-photon source that utilizes cavity-enhanced four-wave mixing in a high-Q silicon microresonator. The photon-pair source has a spectral brightness of 6:25 × 108 pairs/s/mW2/GHz and a quantum cross-correlation of g(2)si (0) = (2:58 ± 0:16) × 104. The generated photons are single-mode, with a quantum self-correlation of 1:87 ± 0:05. The heralded single photons has conditional photon autocorrelation gc(2) as low as 0:0075 ± 0:0017 at 5:9 × 104 pair/s.
We show that optical soliton can be realized in very short waveguides (5 mm long) fabricated on silicon-on-insulator
(SOI) wafers. By tailoring their zero-dispersion wavelength and launching optical pulses at only sub
pico-joule energy level close to this wavelength, we have observed significant spectral narrowing due to the pulse
reshaping during the formation of optical soliton, which is in strong contrast to previous measurements. The
extent of spectral narrowing depends on the carrier wavelength of the input pulse in the normal dispersion region
and spectral broadening is observed in normal dispersion region. We simulate femto-second pulses' propagation
in such waveguide. Simulation results show the evolution of the pulse shape in both time domain and frequency
domain when the pulse energy is increased from very low level, when nonlinear effects are negligible, to the
energy level we used in our experiment. The simulation results agree well with our observation. To be best of
our knowledge, this is the first report on soliton in silicon waveguides.
We report the development and characterization of 2-D photonic crystal (PC) microcavity devices on silicon on
insulator. The transmission of light through a 2-D PC microcavity near resonance can be switched on and off by
modulating the refractive index of the PC. Because silicon has poor electro-optical properties, it is advantageous to insert
electro-optic materials inside the air holes. In this work, we report the design, fabrication, and characterization of such
hybrid PC microcavity switches using liquid crystals as the electro-optic material. In addition, we demonstrate an
electrode geometry that eliminates electric field screening by the more conducting silicon host, and thus enables
switching.
fabrication.
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