Detection of radiation force due to simultaneous two-photon absorption

Syoji Ito; Mizuki Hayasaka; Masato Mori; Masafumi Koga; Shinya Nakamura; Kenji Setoura; Hikaru Sotome; Hiroshi Miyasaka

doi:10.1117/12.2616009

27 October 2021 Detection of radiation force due to simultaneous two-photon absorption

Syoji Ito, Mizuki Hayasaka, Masato Mori, Masafumi Koga, Shinya Nakamura, Kenji Setoura, Hikaru Sotome, Hiroshi Miyasaka

Proceedings Volume 11926, Optical Manipulation and Structured Materials Conference 2021; 119260B (2021) https://doi.org/10.1117/12.2616009
Event: SPIE Technologies and Applications of Structured Light, 2021, Online, Japan

Abstract

In the present study, we have precisely tracked the three-dimensional (3D) motion of single nanoparticles under optical trapping by focused femtosecond laser pulses for detecting radiation force due to simultaneous multiphoton absorption. A 300-nm polymer particle containing dye molecules was optically trapped with pulsed laser (800 nm, 200 fs at the focal point). The 3D motion of the trapped polymer nanoparticle was observed with astigmatism fluorescence imaging method. The trapping point shifted on the optical (Z-) axis towards the propagation direction of the femtosecond laser with increasing laser power. The Z-displacement was dependent on incident laser power and, from which we concluded that the positional shift along the Z-axis can be ascribed to the radiation force due to simultaneous two-photon absorption of the laser pulses by the particle.

Citation Download Citation

Syoji Ito, Mizuki Hayasaka, Masato Mori, Masafumi Koga, Shinya Nakamura, Kenji Setoura, Hikaru Sotome, and Hiroshi Miyasaka "Detection of radiation force due to simultaneous two-photon absorption", Proc. SPIE 11926, Optical Manipulation and Structured Materials Conference 2021, 119260B (27 October 2021); https://doi.org/10.1117/12.2616009

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KEYWORDS

Absorption

Particles

Femtosecond phenomena

Nanoparticles

Luminescence

Optical tweezers

Laser vision correction

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