KEYWORDS: Near field scanning optical microscopy, Indium gallium phosphide, Gallium arsenide, Scanning electron microscopy, Quantum dots, Metalorganic chemical vapor deposition, Optical spheres, Semiconductors, Near field optics, Solids
InP self-assembled structure were grown by MOCVD method on GaInP epitaxial layer mismatched to the GaAs substrate and were measured by employing the Near-field Scanning Optical Microscopy (NSOM) and SEM. The distribution of self-assembled islands was analyzed from the NSOM images and SEM results based on the scaling theories. It is found the distribution periodicity of the islands along [110] direction is improved and 1μm separation is obtained. The regular distribution was found along [1-10] direction. It shows and the mismatched epitaxial layer could improve the distribution periodicity of the islands along [110] and [1-10] direction. The experiment gives a potential way to realize the ordered two-dimensional distribution of the self-assembled structure. A mode, based on the shear force boundary and QD sphere, was established to explain the difference of our results between the topography and NPC. The size of islands could be evaluated by NSOM if the diameter of the probe has been taken account on.
The GaAlAs/AlAs one-dimensional photonic band gap structure (1D-PBG) was proposed according to the transmission theory. This structure was utilized to tailor the EL spectrum of the commercial GaAlInP red double-heterojunction distributed Bragg reflector LED (DH DBR-LED), whose EL spectrum distributes from 620nm to 670nm (inspired at 120mA). The designed 1D PBG was employed to tailor the spectrum at the area from 620nm to 635nm, 640nm to 655nm, and 660nm to 670nm, left the windows at about 630nm, 640nm, 655nm, and 672nm. This 1D PBG was caped on the DBR-LED surface, and realized by MOCVD method. The EL spectrum of the sample has the illumination peak at 631nm, 640nm, 655nm and 672nm. The result is very consistent with the calculation. The spectrum of the LED was tailored according to the design. The influence of the 1D-PBG to the light emitting angle was studied too.
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