SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Atomic Systems in External Fields
A 10.3: Vortrag
Dienstag, 7. März 2023, 11:45–12:00, F107
Generating a focal field dominated by an arbitrary multipole component in 4Pi optical systems — •Yuxiong Duan2, Markus Sondermann1,2, and Gerd Leuchs1,2 — 1Institute of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany — 2Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
Selective multipole excitation is of great interest in laser spectroscopy of atoms and nano-particles [1,2]. In particular, tailored excitation fields have been utilized for addressing individual multipole resonances while suppressing others. However, almost without exception, the light fields that have been applied contain numerous multipole components [3]. In contrast, here we establish a theoretical framework for shaping a focal field which is dominated by only the target multipole. This is possible in 4Pi optical systems. We derive analytically the angular spectrum of pure multipoles. Taking an ideal parabolic mirror as an example, we demonstrate how to determine the matching incident beam through a mathematical relation to the angular spectrum of the target multipole. Moreover, geometric factors including the limited system size and the orientation of the quantization axis of the target multipole have been investigated. Our results indicate that the generated field can be applied for maximizing the selective multipole excitation strength and enriching laser spectroscopy with high controllability.
[1] C. T. Schmiegelow, et al, Nat. Commun. 7, 1-6 (2016).
[2] P. Woźniak, et al, Laser Photonics Rev. 9, 231-240 (2015).
[3] R. Maiwald, et al, Nat. Phys. 5, 551-554 (2009).