Core-shell droplet formation of a temperature-responsive ionic liquid by a near-infrared focused laser beam

Maho Tanaka; Yasuyuki Tsuboi; Ken-ichi Yuyama

doi:10.1117/12.3008350

20 September 2023 Core-shell droplet formation of a temperature-responsive ionic liquid by a near-infrared focused laser beam

Maho Tanaka, Yasuyuki Tsuboi, Ken-ichi Yuyama

Author Affiliations +

Proceedings Volume 12606, Optical Manipulation and Structured Materials Conference; 126060U (2023) https://doi.org/10.1117/12.3008350
Event: Optics and Photonics International Congress, 2023, Yokohama, Japan

Abstract

We demonstrate single droplet formation in an ionic liquid/water mixture by optical tweezers. Upon focusing a near-infrared laser beam into the aqueous solution, a liquid droplet is formed at the focal spot. The droplet is stably trapped and increases in its size. The growth rate becomes faster at the higher laser power. The droplet has a core in its inside. The core-shell structure is confirmed by transmission and fluorescence imaging. We discuss the droplet formation dynamics from the viewpoints of optical force and local temperature elevation.

Citation Download Citation

Maho Tanaka, Yasuyuki Tsuboi, and Ken-ichi Yuyama "Core-shell droplet formation of a temperature-responsive ionic liquid by a near-infrared focused laser beam", Proc. SPIE 12606, Optical Manipulation and Structured Materials Conference, 126060U (20 September 2023); https://doi.org/10.1117/12.3008350

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