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(a) Individual GaN nanowires. The scale bar represents 10 μm. (b) The GaN nanowires were manipulated into a coupled nanowire cavity. The scale bar represents 5 μm.
Lasing emission spectra of the coupled nanowire-pair and corresponding separated individual nanowires. The three spectra were obtained with the same pump intensity of 1429 kW/cm2.
SEM image of two partially overlapped nanowires for verifying the evanescent coupling. The scale bar represents 3 μm. The inset is the CCD image when nanowire A was optically pumped.
Calculated transmission of the 7.8 and 8 μm cavities.
Overlapping wavelengths for the nanowire-pair versus effective group refractive index ng . Three points nearest the gain spectrum are plotted for each ng . The shaded area indicates the gain bandwidth.
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