A laminated micropolarizer of Pb nanowire arrays was fabricated within an anodic alumina membrane (AAM) by anodization of the pure Al foil and subsequent electrodeposition of Pb. X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, selected‐area electron diffraction, and high‐resolution electron microscopy investigations reveal that the ordered Pb nanowires are essentially single crystal, and have an average diameter of 40 nm. Spectrophotometry measurements show that the Pb nanowire arrays embedded in AAM can only transmit polarized light vertical to the wires. An extinction ratio of 17 to 18 dB and an average insertion loss of 0.4 dB cm–1 in the wavelength range of 1 to 2.2 μm were obtained, respectively. Therefore, these Pb nanowire/AAM composites can be used as a wire grid type micropolarizer.
A silver nanowire array micropolarizer within an anodic alumina membrane
(AAM) was fabricated by anodization of pure Al foil and electrodeposition of Ag,
respectively. X-ray diffraction, scanning electron microscopy, and transmission
electron microscopy investigations reveal that the nanowires are essentially single
crystals, and have an average diameter of 90 nm. Spectrophotometer
measurements show that the silver nanowire arrays embedded in the AAM can
only transmit vertically polarized light to the wires. An extinction ratio of 25–26
dB and average insertion loss of 0.77 dB in the wavelength range 1–2.2 μm
were obtained, respectively. Therefore the Ag nanowire/AAM can be used as a
wire-grid type polarizer.
We study the effect of softness of the microchannel on the process of droplet generation in two-phase flows in a T-junction microchannel. One side of the microchannel has a flexible thin PDMS layer, which vibrates naturally while droplets are generated; the deformation frequency coincides with the frequency of droplet formation. Furthermore, we compare the polydispersity of water-in-oil droplets formed with a microchannel with one soft wall with those formed in a conventional rigid microchannel. We show that deformation of the soft wall reduces the polydispersity in the droplet size.
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