[19p-211B-1~14] 4.1 Plasmonics and Nanophotonics

▲ [19p-211B-3] Resonant Dielectric Nanoparticles as Efficient Nanoantennas in Optical Regime

〇HIROSHI SUGIMOTO¹, Minoru Fujii¹ (1.Kobe Univ.)

Keywords:Mie resonance, nanoantenna, surface enhaced fluorescence

Low-loss optical nanoantennas composed of high index dielectrics have attracted much attention as an alternative to plasmonic antennas that often suffer from losses of noble metals. Among several high-index dielectrics, Si has some advantages such as earth abundance, CMOS- compatibility and most importantly, the small imaginary part of the permittivity in the optical regime. However, the previously developed fabrication methods have problems in the control of the size, shape and crystallinity and in the scalability for mass production.
In this work, we develop crystalline 50-250 nm Si nanospheres (NSs) dispersible in alcohol. Thanks to the perfect dispersion of Si nanospheres, they can be placed on an arbitrary substrate, enabling the formation of functional nanoantennas. We study in detail the light scattering properties and Purcell effect in Si NSs on metal mirror antennas.