Nanophotonic Force Microscopy: Characterizing Particle-Surface Interactions Using Near-Field Photonics

摘要: Direct measurements of particle-surface interactions are important for characterizing the stability and behavior colloidal nanoparticle suspensions. Current techniques limited in their ability to measure pico-Newton scale interaction forces on submicrometer particles due signal detection limits thermal noise. Here we present a new technique making this regime, which refer as nanophotonic force microscopy. Using photonic crystal resonator, generate strongly localized region exponentially decaying, near-field light that allows us confine small close surface. From statistical distribution intensity scattered by particle able map out potential well trap directly quantify repulsive between As shown Letter, our is not noise, therefore, resolve smaller than 1 pN dielectric 100 nm diameter.