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

Laura A. Sordillo; Sandra Mamani; Mikhail Sharonov; Robert R. Alfano

doi:10.1117/12.2514646

1 March 2019 Twisted light transfers OAM and SAM to electrons in a GaAs photocathode

Laura A. Sordillo, Sandra Mamani, Mikhail Sharonov, Robert R. Alfano

Proceedings Volume 10935, Complex Light and Optical Forces XIII; 109351P (2019) https://doi.org/10.1117/12.2514646
Event: SPIE OPTO, 2019, San Francisco, California, United States

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 (𝑃_𝑂𝐴𝑀) and SAM (𝑃_𝑆𝐴𝑀) beams was investigated. The percent P at 780 nm was approximately 𝑃_𝑂𝐴𝑀 = −14.5% and 𝑃_𝑆𝐴𝑀 = −0.52%.

Citation Download Citation

Laura A. Sordillo, Sandra Mamani, Mikhail Sharonov, and Robert R. Alfano "Twisted light transfers OAM and SAM to electrons in a GaAs photocathode", Proc. SPIE 10935, Complex Light and Optical Forces XIII, 109351P (1 March 2019); https://doi.org/10.1117/12.2514646

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