title: Super-resolution in label-free photomodulated reflectivity.
abstract: We demonstrate a new, label-free, far-field super-resolution method based on an ultrafast pump-probe scheme oriented toward nanomaterial imaging. A focused pump laser excites a diffraction-limited spatial temperature profile, and the nonlinear changes in reflectance are probed. Enhanced spatial resolution is demonstrated with nanofabricated silicon and vanadium dioxide nanostructures. Using an air objective, resolution of 105 nm was achieved, well beyond the diffraction limit for the pump and probe beams and offering a novel kind of dedicated nanoscopy for materials.
authors.affiliation: School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences and ‡The Center for Nanoscience and Nanotechnology, Tel Aviv University , Tel Aviv 69978, Israel.
authors.forename: Omer
authors.initials: O
authors.lastname: Tzang
authors.forename: Alexander
authors.initials: A
authors.lastname: Pevzner
authors.forename: Robert E
authors.initials: RE
authors.lastname: Marvel
authors.forename: Richard F
authors.initials: RF
authors.lastname: Haglund
authors.forename: Ori
authors.initials: O
authors.lastname: Cheshnovsky
mesh_terms: D049329:Nanostructures; D010087:Oxides / Q000737:chemistry; D010777:Photochemistry; D012666:Semiconductors; D017968:Vanadium Compounds / Q000737:chemistry
chemical_list: D010087:Oxides; D017968:Vanadium Compounds; C581824:vanadium dioxide
keywords: Super resolution; label-free; microscopy; semiconductors; ultrafast optics