Optical metrology of nanoparticles, 2D-materials and metasurfaces using high-resolution wavefront microscopy

In this presentation, I show how we used cross-grating phase microscopy (CGM) , a high-resolution, high-sensitivity wavefront imaging technique for applications in nanophotonics, opening a new route of investigations besides cell biology. This contribution is aimed to explain (i) how CGM can be used as a temperature microscopy technique to map the temperature of gold nanoparticles under illumination, enabling applications in physics, chemistry and biology at the nano/microscale; (ii) how CGM can map all the optical properties of 2D materials and nanoparticle lattices (namely the complex optical conductivity, complex refractive index, transmittance, reflectance, absorbance) from a single image acquisition; (iii) how CGM can retrieve the complex optical polarizability of nanoparticles, along with the extinction, scattering and absorption cross section from a single image acquisition, and finally (iv) how CGM can fully characterize metasurfaces.