[19a-H116-1~12] 3.16 Optics and Photonics English Session

△ [19a-H116-10] Sunlight absorption with resonant silicon nanoparticles

〇Satoshi Ishii^1,2, Kai Chen^1,2, Ramu Sugavaneshwar^1,2, Thang Dao^1,2, Tadaaki Nagao^1,2 (1.NIMS, 2.JST-CREST)

Keywords:nanoparticle,sunlight,optical absorption

We demonstrate with electromagnetic calculations and experimental that an ensemble of silicon nanoparticles with different sizes can effectively absorb sunlight. Due to the absorption of silicon from UV to near-infrared region, Mie resonances in silicon nanoparticles dramatically enhance the absorption of solar light. In experiment, silicon nanoparticles dispersed in water worked as excellent sunlight-heat transducers that efficiently harvest sunlight to accelerate heating and vaporization of water by nanoscale local heating. Our study opens up the potential of silicon nanoparticles in various solar-thermal applications.