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Measuring the translational and rotational velocities of particles in helical motion using structured light
Rosales Guzmán, Carmelo; Hermosa, Nathaniel; Belmonte Molina, Aniceto; Pérez Torres, Juan
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció; Universitat Politècnica de Catalunya. FOTONICA - Fotònica
We measure the rotational and translational velocity components of particles moving in helical motion under a Laguerre-Gaussian mode illumination. The moving particle reflects light that acquires an additional frequency shift proportional to the velocity of rotation in the transverse plane, on top of the usual frequency shift due to the longitudinal motion. We determined both the translational and rotational velocities of the particles by switching between two modes: by illuminating with a Gaussian beam, we can isolate the longitudinal frequency shift; and by using a Laguerre-Gaussian mode, the frequency shift due to the rotation can be determined. Our technique can be used to characterize the motility of microorganisms with a full three-dimensional movement. (C) 2014 Optical Society of America
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura
Laser Doppler velocimeter
Interferometry
ORBITAL ANGULAR-MOMENTUM
MICROORGANISMS
ORIENTATION
DIRECTION
SHIFT
Doppler, Efecte
Interferometria
info:eu-repo/semantics/publishedVersion
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