  The multi-wavelength polarized light signals from supermassive black holes
have sparked a range of studies on polarized images of accretion disks and
hotspots. However, the polarization patterns within the innermost stable
circular orbit (ISCO) region remain to be explored. In this study, we focus on
two specific types of orbits, namely the plunging geodesics inward from the
ISCO and homoclinic geodesics, to uncover the polarization features associated
with non-circular motion in a Kerr spacetime. For an on-axis observer, we
specifically develop an approximate function to describe gravitational lensing
along the azimuthal direction, and establish a simplified synchrotron emission
model. Based on these, we analyze the polarized patterns of hotspots
accumulated over time and their Stokes parameters. Moreover, we explore the
polarized image of the plunging region within a thin accretion disk.
