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To fully understand the physics of chiro-optical systems and to derive their potentials, it is essential to observe chiro-optical effects in situ from individual components, since the macroscopic chiro-optical effects cannot be directly translated into the microscopic effects. Here, we observed optical responses at the nanoscale level by detecting optical forces induced by irradiating circularly polarized light onto a tip-sample system. The induced optical forces were well correlated with the differential intensity of the simulated electric field. [ABSTRACT FROM AUTHOR]