Optical trapping with photonic nanojets using various sized polystyrene spheres yields two different regimes

Uma Shankar; Jayesh Goswami; Gokul Nalupurackal; Basudev Roy

doi:10.1117/12.3010743

10 June 2024 Optical trapping with photonic nanojets using various sized polystyrene spheres yields two different regimes

Uma Shankar, Jayesh Goswami, Gokul Nalupurackal, Basudev Roy

Author Affiliations +

Proceedings Volume 12991, Nanophotonics X; 129910U (2024) https://doi.org/10.1117/12.3010743
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Photonic nanojets typically require a spherical object onto which a laser beam is illuminated. The presence of the spherical object creates a near-field nanojet where light is emitted in the vicinity of the sphere. We explore the nanojet emanating from various diameters of the spheres and find that two different regimes can be present. In the first regime, the sphere is small when the transverse dimension of the nanojet is smaller than the diffraction limit while the axial dimension is diffraction limited, as has been recently shown. In addition, we find another regime where the sphere diameter is much larger than wavelength, when the axial dimension of the nanojet is now smaller than the diffraction limit keeping the transverse dimension the same as diffraction limit. This yields very high numerical apertures. We also show that we can optically confine particles with a axial corner frequency which is a factor of three larger than regular optical trapping with 100x objective due to the subdiffractive axial nanojet.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Uma Shankar, Jayesh Goswami, Gokul Nalupurackal, and Basudev Roy "Optical trapping with photonic nanojets using various sized polystyrene spheres yields two different regimes", Proc. SPIE 12991, Nanophotonics X, 129910U (10 June 2024); https://doi.org/10.1117/12.3010743

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