Hou T. Ng

Three-dimensional columnar optical nanostructures fabricated by using lithography-free templating approach

Using a nanowire-based templating approach, lithography-free fabrication of three-dimensional circular optical nanostructures with a minimum physical size of 20 nm is demonstrated. Regular circular gratings with alternating transparent and opaque annular zones and having discrete nanometer length scale separations can be easily achieved. These columnar optical nanostructures could potentially be used for direct integration with other optical components.

Epitaxial single-crystalline inorganic nanowires and nanowalls: growth morphogenesis and applications in nano-optoelectronics

Inorganic single crystal nanowires and nanowalls which exhibit rich growth morphogenesis are shown. More specifically, these were grown on lattice-matched substrates, which facilitate their specific growth directions with respect to the substrates planes. Structural and optical characterizations suggest high single crystallinity of these nanostructures and possible applications in nano-optoelectronics are discussed.