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Design considerations for quasi-planar, high-Q, silicon-on-insulator microphotonic resonators are presented. A figure of merit for use in comparison between microphotonic designs is presented and applied to compare existing and proposed designs.
A membrane photonic crystal cavity coupled to a waveguide is fabricated and characterised. Fabry-Perot method was used to measure propagation losses. We show that coupling results in asymmetric features in the transmission suitable for high-speed analog modulation.
We theoretically present that generation of entangled-photon pairs from biexcitons in a quantum well is dramatically enhanced by using a microcavity. Itpsilas optimal condition is qualitatively understood from the characteristic feature of the cavity QED.
We report on strong coupling between a discrete optical mode of a high-Q micropillar cavity and single excitons of self assembled In0.43Ga0.57As quantum dots and compare the results with previous studies on In0.3Ga0.7As quantum dots.
We review major developments that have led to a high performance, polarization independent, microphotonic circuit. The design and fabrication of complex high-order microring-resonators, along with techniques to freely manipulate polarization states on-chip are presented.
The following topics are dealt with: The following topics are dealt with: exotic nonlinear optical phenomena; periodically poled materials; nonlinear processes in microstructured fiber; grating feedback lasers; instrumentation and diagnostics; optical frequency metrology; mode-locked sources; cellular sensing; molecular sensing; terahertz plasmons; metamaterials; optical signal processing; waveguides...
We demonstrate an on-chip toroidal microcavity nanocrystal quantum dot laser with a threshold energy below 10 femto-Joules at room temperature, a factor of 1 million lower than previously reported for strongly-confined, nanocrystal quantum dot lasers.
Benefits of elliptical micropillars are reported including polarisation control of dot emission; and increased quality factors as one of the loss mechanisms found in circular micropillars is removed.
Optical characterization of a novel type of semiconductor microcavity based on a fully-buried, all-epitaxial design reveals many properties essential for a manufacturable technology. We demonstrate detailed mode-imaging, lasing, as well as a sizeable Purcell effect.
Sum frequency data are reported from the nonlinear interaction of two coherently excited resonant modes of a two-dimensional planar photonic crystal microcavity patterned in a free-standing InP slab.
The second- and third-harmonics enhancement in birefringent silicon-based photonic crystals and microcavities at the photonic band gap edge due to fulfilment of phase matching condition is controlled due to anisotropy of porous silicon dielectric function.
We observed highly non-thermal features from the photoluminescence of InGaAs/GaAs quantum dots in a planar microcavity. The effect was interpreted in terms of the interplay of phonon relaxation and cavity-dependent excitonic radiative recombination.
3D and 1D magnetophotonic crystals based on opals impregnated by Bi-substituted iron-yttrium garnet (Bi:YIG) and Bi:YIG-SiO2 paired multilayer structures are fabricated. Magnetization-induced effect (nonlinear magneto-optical Kerr effect) in secondand third-harmonic generation is observed.
We propose silicon waveguide-coupled octagonal microresonators with directional coupling to single modes. Numerical simulations suggest that the k-vectors in waveguide-coupled large-sized octagonal microstructures are directional. Experiments demonstrate two modes from a waveguide-coupled 50-mum-size octagonal microresonator.
Rotating crystals that contain a circular path of slow-light structure (e.g. CROW) are studied using tight-binding theory. Novel manifestations of the Sagnac effect in non-degenerate and degenerate modes are explored. Miniature optical gyroscopes are discussed.
We present microdisk terahertz (THz) quantum-cascade lasers (QCls) with diameters reduced down to less than the free-air emission wavelength and compare the measurement results with 3D finite-difference time-domain simulations.
Evanescent perturbation is examined as a means of tuning photonic microcavities over large wavelength ranges. 27 nm reversible tuning is achieved through nanometric control of a silica perturbing body in the near-field of a microring resonator.
We report the first realization of a monolithic vertical-cavity, surface emitting micro optical parametric conversion nanostructure, triply resonant with the parametric frequencies, allowing parametric oscillation or amplification with a very low pump power threshold.
Intracavity laser gas-absorption measurements using a frequency-locked resonant whispering-gallery microresonator are reported. High sensitivity enhancement is observed and is described in terms of the effective detection path length within the microcavity on resonance.
We present small modal area Surface Plasmon waveguides, with low group velocities over unusually large bandwidths. Also, we show how Electro-magnetically Induced Transparency materials, inserted into microcavities, enable optical non-linearities at single photon power levels.
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