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Proceedings Paper

Twisted light transfers OAM and SAM to electrons in a GaAs photocathode
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Paper Abstract

Ultrafast complex light of twisted photons carrying orbital angular momentum (OAM) with ℓ = ±1 or +2 (generated using q-plates with q= ±½, +1), spin angular momentum (SAM) and total angular momentum (J=L+S) from a femtosecond Ti:Sapphire laser (at select wavelengths between 690 nm and 810 nm) was used to excite a GaAs-based photocathode photonic device. The GaAs photocathode has two functions: detector and sample. Using the recorded signal intensity from the p-GaAs photocathode photonic device and lock-in amplifier, the degree of polarization (P) of the photogenerated electrons based on OAM (𝑃𝑂𝐴𝑀) and SAM (𝑃𝑆𝐴𝑀) beams was investigated. The percent P at 780 nm was approximately 𝑃𝑂𝐴𝑀 = βˆ’14.5% and 𝑃𝑆𝐴𝑀 = βˆ’0.52%.

Paper Details

Date Published: 1 March 2019
PDF: 5 pages
Proc. SPIE 10935, Complex Light and Optical Forces XIII, 109351P (1 March 2019); doi: 10.1117/12.2514646
Show Author Affiliations
Laura A. Sordillo, The City College of New York (United States)
Sandra Mamani, The City College of New York (United States)
Mikhail Sharonov, The City College of New York (United States)
Robert R. Alfano, The City College of New York (United States)

Published in SPIE Proceedings Vol. 10935:
Complex Light and Optical Forces XIII
Jesper GlΓΌckstad; David L. Andrews; Enrique J. Galvez, Editor(s)

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