title: Diffractive generalized phase contrast for adaptive phase imaging and optical security.
abstract: We analyze the properties of Generalized Phase Contrast (GPC) when the input phase modulation is implemented using diffractive gratings. In GPC applications for patterned illumination, the use of a dynamic diffractive optical element for encoding the GPC input phase allows for on-the-fly optimization of the input aperture parameters according to desired output characteristics. For wavefront sensing, the achieved aperture control opens a new degree of freedom for improving the accuracy of quantitative phase imaging. Diffractive GPC input modulation also fits well with grating-based optical security applications and can be used to create phase-based information channels for enhanced information security.
authors.affiliation: DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark.
authors.forename: Darwin
authors.initials: D
authors.lastname: Palima
authors.forename: Jesper
authors.initials: J
authors.lastname: Glückstad
mesh_terms: D016494:Computer Security / Q000295:instrumentation*; D005336:Fiber Optic Technology / Q000295:instrumentation / Q000379:methods*; D008027:Light; D008962:Models, Theoretical; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods*