Optical sling shot for nanoparticles in quasi-droplet microresonators (Conference Presentation)

Jonathan M. Ward

doi:10.1117/12.2509149

13 March 2019 Optical sling shot for nanoparticles in quasi-droplet microresonators (Conference Presentation)

Jonathan M. Ward

Proceedings Volume 10904, Laser Resonators, Microresonators, and Beam Control XXI; 1090407 (2019) https://doi.org/10.1117/12.2509149
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Optical trapping and propulsion has been demonstrated previously with microsphere and microring whispering gallery (WG) resonators. The WG mode forms an optical carousel for the trapped particles where the particles propagate in the evanescent field along the circumference of the resonator. Here we extend this study with the use of quasi-droplet WG resonators, and demonstrate the creation of an optical sling shot effect due to the non-uniform scattering of the light field and the unique mode profile of the quasi-droplet WG mode. The sling shot effect is the result of an orbital position dependent scattering force and results in the particle having higher acceleration at certain points in its orbit. This opto-fluidic opto-mechanics system forms a feedback loop that leads to a self-sustained oscillation of the cavity mode frequency and modulation of the transmitted optical power. At the same time, the particle speed can reach very high velocities due to the large overlap of the quasi-droplet WG mode with the particle leading to very efficient propulsion. We also demonstrate for the first time optical trapping using counter propagating WG modes.

Conference Presentation

Citation Download Citation

Jonathan M. Ward "Optical sling shot for nanoparticles in quasi-droplet microresonators (Conference Presentation)", Proc. SPIE 10904, Laser Resonators, Microresonators, and Beam Control XXI, 1090407 (13 March 2019); https://doi.org/10.1117/12.2509149

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