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The optical properties of arrays of hexagonal GaN microdisks, which potentially act as whispering‐gallery‐mode‐type optical microcavities, were investigated. The arrays were fabricated from a GaN film using a top–down process, and the side lengths and height of the hexagonal GaN microdisks were approximately 1.5 and 500 nm, respectively. The microdisk arrays exhibited optically pumped lasing actions...
The field emission from GaN particles has been demonstrated successfully for the first time. The novel field emitting device has a simple structure consisting of an electrically conductive polymer layer and GaN particles spread randomly on it. The GaN particles used for this device, which were synthesized in advance by the two‐stage vapor phase method, have vertices and ridges formed by well‐developed...
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