Samples for the noncorrelative measurements were prepared by spin-coating
the particles for 20 s at 500 rpm, followed by 60 s of 4000 rpm on
an ozone-cleaned glass cover slide. After spin-coating, the samples
were sandwiched with a cavity glass slide (Thorlabs MS15C1) to provide
space for the immersion oil (n = 1.34 immersion oil
for NRs of batch 1 and n = 1.51 for the highly isotropic
spherical NPs). Nanoparticle-aggregates were excluded by postprocessing
the measurement data with a filter function for the PT signals. The
60 nm spherical particles were measured at 5.2 mW heating power at
532 nm and 0.9 mW probe power at 780 nm. The NRs (batch 1) were measured
at 2 mW heating power (660 nm) and 0.27 mW probe power (780 nm).
the particles for 20 s at 500 rpm, followed by 60 s of 4000 rpm on
an ozone-cleaned glass cover slide. After spin-coating, the samples
were sandwiched with a cavity glass slide (Thorlabs MS15C1) to provide
space for the immersion oil (n = 1.34 immersion oil
for NRs of batch 1 and n = 1.51 for the highly isotropic
spherical NPs). Nanoparticle-aggregates were excluded by postprocessing
the measurement data with a filter function for the PT signals. The
60 nm spherical particles were measured at 5.2 mW heating power at
532 nm and 0.9 mW probe power at 780 nm. The NRs (batch 1) were measured
at 2 mW heating power (660 nm) and 0.27 mW probe power (780 nm).