Semiconductor nanowires are attractive
building blocks of optoelectronics
due to high efficiency and optical controllability. In particular,
the mutual controllability of wavelength and polarization of light
is essential for versatile applications such as displays, precise
metrology, and bioimaging. We present quantum wire network emitters
embedded in a single microrod capable of exhibiting orthogonally polarized
dual-wavelength visible light at room temperature. The InGaN/GaN shell
layers were grown on a single hexagonal GaN core microrod, spontaneously
forming site-selective In-rich InGaN quantum wires on each edge between
the nonpolar facets as well as each boundary between the nonpolar
and semipolar facets. The orthogonally self-arranged, two sets of
six quantum wires formed on the edges and the boundaries showed efficient
violet and blue-green color emissions with strong linear polarization
parallel and perpendicular to the c-axis at room
temperature, respectively. This intriguing emission from a single
microrod allows us to mutually manipulate the color and the polarization
of light, which would be beneficial for photonic applications with
unprecedented controllability and functionality.
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