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Electroabsorption properties of 1.3mum InAs/InGaAs/GaAs quantum dot electroabsorption modulator (EAM) are investigated. Onset of absorption to higher electric field suggests the potential to achieve higher optical power handling capability than conventional EAM.
We developed a new approach to fabricate high-quality single-crystalline high-index-contrast waveguiding micro- and nanostructures and demonstrated electro-optic modulation at 1.55 mum in waveguides grown from the melt of a recently developed organic material.
Er concentration, energy-transfer upconversion and gain were investigated in Er-doped aluminum oxide channel waveguides. Net gain of up to 2.0 dB/cm was measured, demonstrating this material to provide a competitive active integrated optics technology.
Waveguides were written in glass using the femtosecond laser direct-write technique. The refractive index changes induced were found to be polarization dependent. We propose that photo-ionization rates are the origin of this polarization dependence.
Silicon photonics technologies are potentially useful in quantum information and communication experiments. This talk describes the first entangled photon-pair generation experiment to use a silicon wire waveguide, and discusses the application of silicon-based entanglement sources in quantum communication systems.
We propose spatiotemporal solitons that consist of trains of short pulses. The pulses are collectively trapped in the transversal directions by a slow nonlinearity and each pulse is self-trapped temporally by a fast nonlinearity.
We design and numerically simulate a photonic crystal waveguide cavity with a nanoslot structure for single nanoparticle trapping. A 135times enhancement of optical gradient trapping force compared to plain waveguide trapping devices has been achieved.
A tunable hollow waveguide with distributed Bragg reflector (DBR) mirror and a high-index-contrast-grating (HCG) mirror has been proposed. We numerically show the possibility of 2D-confinement and reduction in polarization-dependence of the proposed hollow waveguide.
New type of non-volatile high-speed optical memory is proposed, which utilize the magnetization reversal of nanomagnet by spin-polarized photo-excited electrons. To verify high speed of proposed demultiplexing method, the switching of spin polarization at 2.2 TGz was demonstrated.
Recent progress in quantum communication highlights the need of advanced non-Gaussian states exhibiting high purity and spatio-spectral single-mode characteristics. We employ tailored waveguides and photon counting to implement efficient state preparation suitable for quantum networks.
A plasmonic resonant nano-focusing-antenna has been experimentally integrated with a Si waveguide to effectively convert an incoming waveguide mode to a localized plasmon mode and focus light in an ultrasmall volume in all 3 dimensions.
We review the basic principles of the femtosecond laser direct writing approach. This technology opens the possibility to specifically tune the light evolution in the linear as well as in the nonlinear regime.
Ultra-high-Q modes are designed in woodpile photonic crystal by modulating the unit cell size along a waveguide in complete photonic band gap. We propose to fabricate the nanocavities with a two-directional etching without wafer bonding.
An adjustable polarization mode dispersion compensator with a variable tapered-3D-hollow-waveguide Bragg-reflector has been demonstrated exhibiting a giant-birefringence of 0.01 and a 13-psec tuning in differential-group-delay for a 3-mm-long compact device.
Second-harmonic generation is demonstrated in periodically intermixed GaAs/AlGaAs superlattice waveguides by Type-II phase matching. Second-harmonic powers of 2.0 muW were generated at fundamental phase matching wavelength of 1577.4 nm.
Intersubband cavity polaritons in a quantum well waveguide structure are photogenerated by 12-fs near-infrared pulses. Multi-THz transients trace the non-adiabatic switch-on of ultrastrong light-matter coupling and the conversion of bare photons into cavity polaritons.
A cladding-modulated Bragg grating implemented using periodic placements of silicon cylinders in the cladding along a silicon waveguide is proposed. Modeling results are verified experimentally, demonstrating coupling strengths differing by an order of magnitude.
Stoichiometric low loss Tellurium dioxide, TeO2, films have been produced by reactive magnetron RF sputtering. Long rib waveguides with very low loss are fabricated using reactive ion etching techniques. As-deposited TeO2 films and waveguides with propagation loss around or below 0.1 dB/cm at 1550 nm have been achieved.
We provide an overview of the capabilities and limitations of slow light optical buffers. A number of fundamental waveguide properties such as loss and dispersion severely limit the opportunities for practical slow light optical buffering.
We use a heterodyne NSOM with superluminescent diode illumination to measure the loss in an SOI waveguide around a bend. For a bend of radius 10 mum, we measure loss of 0.09 dB.
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