Near-field optical study of AlGaN/GaN quantum-well waveguide

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The optical properties of AlGaN/GaN quantum-well waveguides were studied using ultraviolet near-field scanning microscopy (NSOM) and near-field spectroscopy. The excitation laser beam was focused onto the waveguide from the top by an ultraviolet refractive objective lens. The optical loss at λ=350 nm was found to be 106 cm -1. The experimentally deduced vertical emission divergence angle was in good agreement with the calculated value using Gaussian beam approximation.

Original languageEnglish
Pages (from-to)1832-1834
Number of pages3
JournalApplied Physics Letters
Issue number11
StatePublished - Mar 15 2004


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