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Pan, Yong-Le; Kalume, Aimable; Arnold, Jessica; Beresnev, Leonid; Wang, Chuji; Rivera, Danielle N; Crown, Kevin K; Santarpia, Joshua
Optics express, 2022-Jan-17, 2022-01-17, 20220117, Volume: 30, Issue: 2Journal Article
The circular intensity differential scattering (CIDS), i.e. the normalized Mueller matrix element -S /S , can be used to detect the helical structures of DNA molecules in biological systems, however, no CIDS measurement from single particles has been reported to date. We report an innovative method for measuring CIDS phase functions from single particles individually flowing through a scattering laser beam. CIDS signals were obtained from polystyrene latex (PSL) microspheres with or without coating of DNA molecules, tryptophan particles, and aggregates of B. subtilis spores, at the size of 3 μm in diameter. Preliminary results show that this method is able to measure CIDS phase function in tens of microseconds from single particles, and has the ability to identify particles containing biological molecules.
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