The enhanced transmission through periodic arrays of sub-wavelength holes in optically-thick metallic films has many potential applications, such as in wavelength filters, light extraction from light emission diodes, and subwavelength photolithography. A color filter comprising arrays of subwavelength holes in an aluminum film has been fabricated. In addition to the simplicity of the process, the aluminum film enables the excitation of visible-range surface plasmons due to its high plasma frequency. Periodic nanostructures in the aluminum film open the way for new visible color filters.
A method for inducing nonuniform strain in graphene films is developed.
Pillars made of a dielectric material (electron beam resist) are placed between
graphene and the substrate, and graphene sections between pillars are attached
to the substrate. The strength and spatial pattern of the strain can be
controlled by the size and separation of the pillars. Application of strain is
confirmed by Raman spectroscopy as well as from scanning electron microscopy
(SEM) images. From SEM images, the maximum stretch of the graphene film reaches
about 20%. This technique can be applied to the formation of band gaps in
graphene.Comment: Appl. Phys. Express, in pres
We present an experimental demonstration of a graphene-based double quantum dot system, which exhibits single-electron transport of two lateral quantum dots coupled in series. Low-temperature transport measurements revealed honeycomb charge stability diagrams with a varied (from weak to strong) interdot tunnel-coupling regime, and we have extracted the relevant parameters associated with the double quantum dot system. These results are important for the realization of integrated quantum circuits in graphene-based electronics.
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