[18a-231C-1~10] 3.1 Basic optics and frontier of optics

[18a-231C-2] A development of a novel non-plasmonic optical tweezers using semi-conductor and metallic nano-structures

〇(M2)Yuki Uenobo¹, Tatsuya Shoji¹, Ayaka Mototsuji¹, Sawa Komoto¹, Tatsuya Nagai¹, Linklater Denver², Juodkazis Saulius², Yasuyuki Tsuboi¹ (1.Osaka City Univ., 2.Swinburne Univ. of Tech.)

Keywords:optical tweezers, black silicon, nano structure

We have studied plasmonic optical tweezers (POT) for nanomaterials such as DNA and polymers. These nanomaterials would be efficiently trapped by a plasmon-enhanced optical force. However, plasmonic excitation also leads to a photothermal effect. Such heat generation has frequently hindered stable POT. Recently, we have developed a novel optical trapping; Nano-Structured Semi-Conductor-Assisted (NASSCA) optical tweezers. In NASSCA optical tweezers, we used a metal-free black silicon with a nano-needles structure on the surface. NASSCA exhibited a high-performance in optical trapping. We suggested that a nano-needles structure has a function to enhance optical forces. In the present study, we investigated optical trapping behaviors using a nanostructured metallic substrate instead of a nano-structured semi-conductor substrate.