Development of Optical Tweezers based on Non-plasmonic Nanostructures

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  • ノンプラズモニックナノ構造を用いた光マニピュレーション法の探求
  • ノンプラズモニックナノ構造を用いた光マニピュレーション法の探求 : 2021年度神奈川大学総合理学研究所共同研究助成論文
  • ノンプラズモニックナノ コウゾウ オ モチイタ ヒカリ マニピュレーションホウ ノ タンキュウ : 2021ネンド カナガワ ダイガク ソウ ゴウリガク ケンキュウジョ キョウドウ ケンキュウ ジョセイ ロンブン

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A plasmon-enhanced electric field exerts a strong optical force on nanomaterials, leading to their optical trapping on plasmonic nanostructures. Such nanostructure-assisted optical manipulation techniques may become a promising tool for manipulation of nanomaterials. Recently, we demonstrated stable optical trapping of polymeric nanobeads on a nanostructured titanium surface (B-Ti). Irradiation of an incoherent weak UV light source resulted in optical trapping of numerous nanobeads on an irradiated black-Ti surface area: nanostructured Tiassisted optical tweezers (NASTiA-OT). Such laser-free optical trapping behavior would be caused by an electric-field enhancement effect of nanostructured TiO2 as a passive layer of black-Ti surfaces. However, the precise trapping mechanism is still under debate. In the present study, we demonstrate optical trapping of polystyrene nanospheres on black-Ti surfaces fabricated by an acid-etching process. Acid treatment resulted in wrinkle-like nanostructures on titanium surfaces. Irradiation of nanostructures with near-infrared laser light led to optical trapping of polystyrene nanospheres. We discuss the formation mechanism of B-Ti based on the redox reaction, and trapping mechanism based on calculation of the local electric field with the finite element method.

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