Two-photon absorption with tightly focused optical vortices

Kayn A. Forbes; Dale Green

doi:10.1117/12.2605922

2 March 2022 Two-photon absorption with tightly focused optical vortices

Kayn A. Forbes, Dale Green

Proceedings Volume 12017, Complex Light and Optical Forces XVI; 1201706 (2022) https://doi.org/10.1117/12.2605922
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Unlike single photon absorption, the rate of multiphoton absorption processes is dependent on the polarization state of the exciting optical field. Multiphoton absorption spectroscopy is predominantly carried out with an exciting light source which is structured and polarized in a 2D sense in the transverse (x,y) plane, but homogeneous along the direction of propagation (z). Here we study two-photon absorption (TPA) with tightly focused optical vortices, where the spatial confinement generates significant longitudinal components of the electromagnetic fields in the direction of propagation, producing a 3D structured optical field at the focal plane. We discover that the additional polarization degree of freedom in the z direction for 3D structured light produces novel results in TPA compared to the preceding paraxial source excitation.

Conference Presentation

Citation Download Citation

Kayn A. Forbes and Dale Green "Two-photon absorption with tightly focused optical vortices", Proc. SPIE 12017, Complex Light and Optical Forces XVI, 1201706 (2 March 2022); https://doi.org/10.1117/12.2605922

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