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 (πππ΄π) and SAM (πππ΄π) beams was investigated. The percent P at 780 nm was approximately πππ΄π = β14.5% and πππ΄π = β0.52%.
A portable near infrared scanning polarization imaging unit with an optical fiber-based rectal probe, namely Photonic
Finger, was designed and developed o locate the 3D position of abnormal prostate site inside normal prostate tissue. An
inverse algorithm, Optical Tomography using Independent Component Analysis (OPTICA) was improved particularly
to unmix the signal from targets (cancerous tissue) embedded in a turbid medium (normal tissue) in the backscattering
imaging geometry. Photonic Finger combined with OPTICA was tested to characterize different target(s) inside different
tissue medium, including cancerous prostate tissue embedded by large piece of normal tissue.
It was shown that broadband near infrared fluorescence in recently discovered in Bi-doped glasses is not specific to Biions.
Germanate glasses doped with different 6p (Bi, Pb) and 5p (Sn, Sb) ions (co-doped with Al) exhibit similar behavior. The centers can be characterized by 4 peaks in the excitation-emission plots. The decay of fluorescence (excited with short laser pulse at 800 nm and 532 nm) has complex behavior. The components of the decay are in the nsto ms- range and they have different temperature dependences. To our opinion, existing models of optical center suggested earlier should be revised to agree with new data.
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