[11p-M135-1~13] Nano-Material optical-manipulations open up novel phenomena, functions and technologies

[11p-M135-10] Nanostructured Semiconductor-Assisted (NASSCA) Optical Tweezers

〇Yasuyuki Tsuboi¹ (1.Osaka City Univ.)

Keywords:Black Si, plasmon, nanoparticle

In the last decade, a breakthrough brought optical tweezers into the nano-world, overcoming the diffraction limit. This is called plasmonic optical tweezers (POT).¹⁾ POT are powerful tools used to manipulate nanomaterials. However, POT has several practical issues that need to be overcome. First, it is rather difficult to fabricate plasmonic nanogap structures regularly and rapidly at low cost. Second, in many cases, POT suffers from thermal effects (Marangoni convection and thermophoresis se).
Here, we propose an alternative approach using a nano-structured material that can enhance the optical force and be applied to optical tweezer. The material is metal-free black silicon (MFBS), the plasma etched nano-textured Si. We demonstrate that MFBS-based optical tweezers can efficiently manipulate small particles with characteristic features.
We call this technique NASSCA optical tweezers (Nano-Structured SemiConductor Assisted optical tweezers). This is the NON-PLASMONIC NOVEL optical tweezer. It is MFBS-assisted optical trapping.