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An optical wavelength filter at the nanoscale can be fabricated with semiconductor nanowire homojunctions based on photonic confinement in the nanowire channels with different diameters. By assembling the nanowire homojunctions with short‐pass functions, and crossed junctions with long‐pass functions, multichannel wavelength filters are set up for dividing the UV and visible green light signals and...
Semiconductor nanowire homojunctions are grown via a homoepitaxial regrowth method in a chemical vapor deposition system by J. Yao, Y. S. Shao and co‐workers on page 620. In a single nanowire homojunction, the channel with the larger diameter permits the propagation of multi‐wavelengths of light, whereas the channel with the smaller diameter only confines light with a short wavelength and filters...
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