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Proceedings Paper

Cell mechanics investigation by digital holographic microscopy
Author(s): L. Miccio; P. Memmolo; F. Merola; S. Fusco; V. Embrione; P. A. Netti; P. Ferraro
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Paper Abstract

In biology and biomedical research fields one of the main topic is the understanding of morphology and mechanics of cells and microorganisms. Biological samples present low amplitude contrast that limits the information that can be retrieved through optical bright-field microscope measurements. Optical transparency is overcame for fixed specimen by means of staining techniques but such well-established methods present the issue to be invasive and not applicable on live cells. Study of microorganism in their natural environment without perturbing their equilibrium is challenging in biology. The main effect on light propagating in such objects is in phase, indeed it is altered respect to the phase of the beam propagating in the surrounding medium. This is known as phase-retardation or phase-shift. Objects are visible by Phase Contrast Imaging (PCI) due to interferometric processes able to transform tiny phase variation in amplitude modulation so that any small differences in the beam optical path can be visualized. Digital Holography (DH) in microscopy present as a powerful tool to overcome all these issues. The main characteristic is the possibility to discern between intensity and phase information performing quantitative mapping of the Optical Path Length. Up to now, DH has been considered as an innovative and alternative approach in microscopy and it’s a good candidate for complete specimen analysis in the framework of no invasive microscopy. In this paper, the flexibility of DH is employed to analyze in a completely and no-invasive way the cell mechanics of live and unstained cell subjected to appropriate stimuli. The potentialities of DH are employed to measure all the parameters useful to understand the deformations induced by external and controlled stress in living cells.

Paper Details

Date Published: 23 May 2013
PDF: 6 pages
Proc. SPIE 8792, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials, 87921F (23 May 2013); doi: 10.1117/12.2020925
Show Author Affiliations
L. Miccio, Istituto Nazionale di Ottica, CNR (Italy)
P. Memmolo, Istituto Nazionale di Ottica, CNR (Italy)
Istituto Italiano di Tecnologia (Italy)
F. Merola, Istituto Nazionale di Ottica, CNR (Italy)
S. Fusco, Istituto Italiano di Tecnologia (Italy)
V. Embrione, Istituto Italiano di Tecnologia (Italy)
P. A. Netti, Istituto Italiano di Tecnologia (Italy)
P. Ferraro, Istituto Nazionale di Ottica, CNR (Italy)

Published in SPIE Proceedings Vol. 8792:
Optical Methods for Inspection, Characterization, and Imaging of Biomaterials
Pietro Ferraro; Monika Ritsch-Marte; Simonetta Grilli; David Stifter, Editor(s)

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