Polarization-resolved LSPR measurements. AFM observation did not clearly reveal the presence of locally attached polymer networks at the AuNP hotspot for the second polymer poly(NIPAAm94-co-MAA5-co-BPQAAm1) with a lower amount of 1% incorporated photocrosslinker, which we attributed to the softer characteristics of the formed hydrogel associated with lower crosslink density and high swelling ratio. Therefore, we took advantage of the thermoresponsive properties of this pNIPAAm-based hydrogel and monitored the re-distribution of surface mass density around the AuNPs when modulating temperature above and below the VPTT of pNIPAAm. The LSPR wavelength λLSPR shifts with changes in the refractive index of the medium surrounding the AuNPs that is proportional to the surface mass density of polymer materials. As the writing NIR fs beam was polarized for the PE-MPC, the prepared hydrogel nanostructures are expected to be attached only to the AuNP walls that are perpendicular to the incident electric intensity vector of the writing beam (see near-field distribution in Figure ). In the collapsed state, when the temperature of the structure is above the pNIPAAm VPTT, the polymer network should be compacted at these AuNP sides while below the VPTT in the swollen state, a delocalization and wrapping over the whole AuNPs is expected owing to its high swelling ratio.