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High-stiffness optical traps are developed for dielectric and metallic particles by exploiting the strong confinement of light in slot-graphite photonic crystal. An optical sieve is realized using the difference in growth kinetics of different nanoparticles.
We show the first demonstration of all-dielectric near-field optical Brownian ratchets of 520 nm particles with a transport speed of ∼1 μm/s, 10–100 times greater than other optical ratchets.
We exploit the resonant enhancement of light in photonic crystal slabs to enhance selected optical properties. Enhancement of absorption and local field gradients result in applications to microscale heating and optical trapping, respectively.
We demonstrate for the first time the assembly of an array of gold particles using a guided-resonance mode of a photonic-crystal slab. The 200nm diameter particles form a triangular lattice with spacing of 1140 nm and exhibit high stability.
We design a surface passivation scheme for axial junction GaAs nanowire solar cells and simulate its performance by coupled optical and electrical simulations. This design uses a wide bandgap AlGaAs shell layer to generate modulation doping in the active region and protect photogenerated carriers from the surface and top contact. The design has both excellent optical and electrical properties and...
We have recently demonstrated that GaAs nanosheets can be grown by metal-organic chemical vapor deposition (MOCVD). Here, we investigate these nanosheets by secondary electron scanning electron microscopy (SE-SEM) and electron beam induced current (EBIC) imaging. An abrupt boundary is observed between an initial growth region and an overgrowth region in the nanosheets. The SE-SEM contrast between...
We use electromagnetic simulations and detailed balance analysis to calculate limiting efficiencies of tandem solar cells consisting of III-V nanowires on silicon. We optimize the nanowire structural parameters and provide general design guidelines.
We study the effect of aperiodicity on silicon nanorod antireflection structures. Numerical results reveal that randomness is beneficial for small nanorod sizes. A guided random walk algorithm is used to obtain optimized aperiodic structures.
We propose a novel feature system of language training for hearing-impaired childrenpsilas speech rehabilitation based on DE1 development board, which contains an on-chip system called uc/os. The system is imbedded with Nios II processors, which could make our system stable, portable and cheap. Considering the limited storage and calculation ability of imbed system, at the same time, and we recognize...
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