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2022 Fiscal Year Final Research Report

Generation of ultrasound utilizing evanescent light

Research Project

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Project/Area Number 20K04291
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionTokyo Denki University

Principal Investigator

Matsuya Iwao  東京電機大学, 理工学部, 准教授 (00514465)

Co-Investigator(Kenkyū-buntansha) 遠藤 正樹  東京電機大学, 理工学部, 教授 (80259837)
Project Period (FY) 2020-04-01 – 2023-03-31
Keywordsエバネッセント光 / インクジェット / 金ナノ粒子 / アブレーション
Outline of Final Research Achievements

At the beginning of this research, the ablation by means of evanescent light was investigated. But it was figured out that the bottom of the prism where the pulsed laser is totally reflected is unavoidably broken. Because at the reflection point, the intensity of the electric field is enhanced up to 1.75 times. We proposed a new method that the evanescent light is irradiated on Au nanoparticles and the field-intensity is greatly improved. Without the destruction of the prism where the laser is totally reflected, we have achieved to show the inkjet phenomena of a water droplet based on the laser ablation. By using the electromagnetic field simulation (COMSOL), when the distance between two Au nanoparticles is to be from 0 to 0.5 nm, the electric field is enhanced up to fifty times on average. It is obvious that the ablation depends on the temperature increase via the enhanced electric field by the interaction between the evanescent light and the Au nanoparticles.

Free Research Field

計測工学

Academic Significance and Societal Importance of the Research Achievements

本研究成果によって、パルスレーザのエネルギを3次元的に閉じ込める事に成功(エバネッセント光の深さ方向および金ナノ粒子が配置されている平面方向)したため、極小点の熱源が構築できたと考えられる。現在のインクジェット技術は印刷だけでなく、3Dプリンタや再生医療等にも応用範囲が広がっている。現状では抵抗線によるヒータが配置されており、熱で気泡を発生させることで液滴を吐出する。しかしながら抵抗線のエネルギ密度が低いため、ヘッドの小型化が律則されていることが問題となっている。今回の成果を活用すれば、極小点の熱源による全く新しいインクジェット機構ができる可能性がある。

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Published: 2024-01-30  

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