This research endeavours to employ optical trapping technique for manipulating a single microcrystalline cellulose microcluster (MCCM) in solution. The viscosity of low concentration microcrystalline cellulose (MCCM) solutions was assessed to identify optimal concentrations for optical tweezer applications. These solutions were prepared via the sonication method, and their viscosity was measured using a rheometer. Utilizing optical microscopy, MCCM formation was observed to determine suitable size ranges for optical trapping. A single MCCM was successfully trapped using a 976nm linearly polarized laser with a numerical aperture of 1.4, whist manipulation was achieved employing a circularly polarized laser. The translation motion of the MCCM was facilitated by a piezostage system. Trajectories of the MCCM were analyzed through visual observation via a CCD camera and scattering light detection with a quadrant photodiode (QPD). The findings indicated that solutions with concent.....

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