Two-photon absorption with tightly focused optical vortices

Forbes, Kayn ORCID: and Green, Dale ORCID: (2022) Two-photon absorption with tightly focused optical vortices. In: Complex Light and Optical Forces XVI. Proceedings of SPIE - The International Society for Optical Engineering, XVI . SPIE Press, San Francisco, California, United States. ISBN 9781510649057

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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
Additional Information: Funding Information: KAF thanks the Leverhulme Trust for funding him through a Leverhulme Early Career Fellowship ECF-2019-398.
Uncontrolled Keywords: structured light,multiphoton absorption,nonlinear optics,nonlinear spectroscopy,optical spectroscopy,optical vortex,electronic, optical and magnetic materials,condensed matter physics,computer science applications,applied mathematics,electrical and electronic engineering ,/dk/atira/pure/subjectarea/asjc/2500/2504
Faculty \ School: Faculty of Science > School of Chemistry
UEA Research Groups: Faculty of Science > Research Groups > Centre for Photonics and Quantum Science
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Depositing User: LivePure Connector
Date Deposited: 09 Mar 2022 10:30
Last Modified: 19 May 2023 10:34
DOI: 10.1117/12.2605922


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