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The near field scanning optical microscopy (NSOM) is not only a tool forimaging of sub-diffraction limited objects but also a prominent characteristictool for understanding the intrinsic properties of the nanostructures. In orderto understand the light-matter interactions in the near field regime using NSOMtechnique with an excitation of 532 nm (2.33 eV), we selected an isolatedsingle semiconducting AlGaN nanowire (NW) of diameter ~120 nm grown via vaporliquid solid (VLS) mechanism along with metallic Au nanoparticle (NP) catalyst.The role of electronic transitions from different native defect related energystates of AlGaN are discussed in understanding the NSOM images for thesemiconducting NW. The effect of strong surface plasmon resonance absorption ofexcitation laser in the NSOM images for Au NP, involved in the VLS growthmechanism of NWs, is also observed. Keywo

Light-matter interaction of single semiconducting AlGaN nanowire and noble metal Au nanoparticle in the sub-diffraction limit