Measuring the Size of Single Plasmonic Nanoparticle via Microlens Assisted Scattering Imaging

We present a microlens assisted imaging approach for measuring the size of plasmonic nanoparticles at single particle level. Upon the utilization of microlenses, single gold nanoparticle with diameter below the classical optical diffraction limit can be measured under the conventional light microscope. Compared to the traditional approach (such as dark field microscopic technique), our approach offers higher temporal resolution and allows for the use of simpler optical setups.