Two-photon absorption with tightly focused optical vortices

Forbes, Kayn and Green, Dale (2022) Two-photon absorption with tightly focused optical vortices. In: Proceedings of SPIE, Complex Light and Optical Forces XVI. SPIE Press, San Francisco, California, United States.

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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.

Item Type: Book Section
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: LivePure Connector
Date Deposited: 09 Mar 2022 10:30
Last Modified: 02 Apr 2022 23:59
DOI: 10.1117/12.2605922

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