The Asia-Pacific Conference on Near-field Optics (APNFO) has provided an opportunity for leading scientists and young researchers in the field of nano-optics to discuss new ideas and approaches in cutting-edge research, and to network with each other. Rapid progress in nanoscience and nanotechnology has made near-field optics more attractive and applicable to various research fields on condensed matter physics including chemistry and biology. The unique characteristics of light-matter interactions on the nanoscale have provided a tool for microscopic study to pursue basic science interests, including the quantum mechanical nature of light and electrons. It has also brought a discipline to address engineering and manufacturing challenges for making devices smaller, faster, and more energy-efficient, and more importantly, for promoting conceptually new device paradigms. In the coming phase, the near-field nano-optics is expected to be applied not only to biosensors and nanofabrication technology, but also to light-energy conversions and storages such as solar cells and artificial photosynthesis. At APNFO-13, we organize a special session entitled "Hot carrier sciences and its application to light-energy conversions" to allow participants to share their experiences, problems, and concerns, and to discuss promising future directions.