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. Author manuscript; available in PMC: 2018 Mar 7.
Published in final edited form as: Lab Chip. 2015 Jul 29;15(17):3460–3464. doi: 10.1039/c5lc00444f

Fig. 1.

Fig. 1

Schematic diagram of optomechanical stiffness measurement. (a) A cell on a sensor can be modelled as a spring-damper-mass system. (b) When the LDV laser is located inside the cell body, oscillation of the cell body modulates the optical path length of the LDV laser, causing the apparent shift of the measured velocity’s phase.