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We will discuss our experimental and theoretical work on a number of solid-state quantum information processing devices enabled by combining nanophotonic structures - photonic crystals with artificial atoms (such as quantum dots).
We demonstrate that optical solitons can exist in dispersion-inverted highly-nonlinear AlGaAs nanowires. These self-localized waves are possible at very low power levels in millimeter long nanowire structures.
We have measured an optical Stark effect in semiconducting single-walled carbon nanotubes. Upon application of a non-resonant pump beam, we observe an instantaneous blue shift in the optical resonances that scales linearly with pump intensity.
We have reported periodic pore formation with diameter in 80 nm and aspect ratio above 250 on N+(100) silicon substrate and demonstrated the fabrication of silicon 3-dimensional microstructures by applying double directional etchings method.
We present new class of waveguides with metamaterial cores. In contrast to conventional structures, our system propagates light on subwavelength scale and provides effective nano-to-micro coupling. The design is scalable from optical to THz frequencies.
We combine chemically-synthesized single nanowire emitters with lithographically-defined photonic crystal structures. Localized emission from engineered defects and light suppression in regions of the photonic crystal are demonstrated by photoluminescence imaging and spectroscopy measurements.
Utilizing soft-lithography based nanofluidics and silicon nanophotonics we demonstrate ultracompact tunable spectral filtering. Liquid based addressing and high refractive index modulation of a single row of holes within a planar photonic crystal is demonstrated.
We report on surface plasmon (SP) enhanced random lasing from a silver nanoparticle-laser dye system. The metal nanoparticle based random laser yielded a smaller bandwidth and pump fluence threshold than a dielectric based random laser.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
We report demonstration of an optical magnetic mirror achieved by nanostructuring a metal surface. In contrast to normal mirrors, it inflicts only small change to the phase of a reflected wave, offering intriguing applications.
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.
We demonstrate characteristics of InAs/GaAs quantum-dot photonic-crystal lasers with high spontaneous emission coupling efficiencies and soft-turn-on behaviors. Pronounced bunching signals subside with the increase of pumping, revealing the onset of lasing operations.
We demonstrate the strong coupling between a CdSe nanocrystal and a single photon mode of a polymer microsphere. The strong exciton-photon coupling is manifested by the observation of a cavity mode splitting of hOmegaexpap37 mueV.
We demonstrate the design and fabrication of optically pumped sub-diffraction nanophotonic waveguides using a self assembly process to attach two different types of quantum dots on a silicon dioxide substrate, thus enabling low crosstalk.
Interaction of localized plasmons and propagating waveguide modes leads to strong coupling and polariton formation. These polaritons are the basis of nanoplasmonic effects in linear and nonlinear optics. Experiments, theory, and applications are presented.
Using a heterodyne nearfield scanning optical microscope (H-NSOM) we characterize the operation of a novel graded-index slab lens made of subwavelength features. Measured amplitude and phase distributions show light focusing and is used to learn about the device performance.
Ultraviolet light was detected by MOS devices with silicon nanocrystals-embedded mesoporous silica sensing layers. The detector reveals high photoresponse of 2.0 (0.3) A/W at wavelength 370 (275) nm, and is blind to green light.
We demonstrate a nanoimprint process for fabrication of photonic crystal devices. The nanoimprint process, defining stamp patterns in a thin e-beam resist, yields improved pattern replication compared to direct e-beam writing of the devices.
We present the first experimental demonstration of anomalous group-velocity dispersion in cover a wide bandwidth. We also introduce a method to tailor the group-velocity dispersion in the waveguides from -2000 to 1500 ps/(nmmiddotkm).
We present the first full theoretical study of femtosecond pulse propagation in silicon wires. Dispersion effects up to the third order, Kerr nonlinearity, intrinsic losses, free carrier and two-photon absorption effects are included.
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