GaAs nanowires were grown by the metal organic chemical vapor deposition on the GaAs(111)B substrates via Vapor-
Liquid-Solid mechanism with various Au film thickness. Experiment results indicated that thicker Au film results in
larger diameters, more dispersed size distribution, and lower density of the nanowires. All NWs are straight from base to
top, and no lateral growth occurs. The growth rate of nanowires slightly increases with Au film thickness. It indicates
that the growth of GaAs NWs is mainly promoted by the catalyzed chemical reaction at the drop surface, the Au particles
surface density could influence the growth rate, and contribution of diffusion from the adatom could be neglected.
Two-dimensional subwavelength gratings (2D-SWGs) that consist of net-grid structure are studied by rigorous coupledwave
approach (RCWA) and finite-difference-time-domain (FDTD) method. 2D-SWGs can be designed as infrared
reflectors whose reflectivity can reach 99.98% at 1.55μm while maintaining reflectivity higher than 99% across the 1.47-
1.59μm wavelength range. We design these SWGs as the bottom mirrors in resonant cavity enhanced photodetectors
(RCE-PDs) for optical communication system. Because SWGs can achieve high reflectivity as well as wide bandwidth,
RCE PD's quantum efficiency is increased to 95.7% at 1.55μm and the device has a significant size reduction compared
with using DBR bottom mirror.
InP nanowires were grown on InP(100) substrates via VLS mechanism with Au particles as catalyst. Various
morphologies of the nanowires such as straight, L-branch, Y-branch, K-branch, bottle-shape, cone-shape, needle-shape
were obtained.
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