title: Fourier ptychographic microscopy using an infrared-emitting hemispherical digital condenser.
abstract: Fourier ptychographic microscopy is demonstrated in the near-infrared spectral range using a computer-controlled hemispherical digital condenser comprising multiple 940 nm wavelength light emitting diodes. This technique was used to image periodic patterned samples (photonic crystals). Experimental and simulated results using a phase retrieval algorithm were found to be in excellent correspondence. We show that for samples with a single period in each direction, the resolution of the obtained high-resolution near-infrared images is limited by the Rayleigh criteria.
authors.forename: Sanchari
authors.initials: S
authors.lastname: Sen
authors.forename: Ishtiaque
authors.initials: I
authors.lastname: Ahmed
authors.forename: Batool
authors.initials: B
authors.lastname: Aljubran
authors.forename: Ayrton A
authors.initials: AA
authors.lastname: Bernussi
authors.forename: Luis
authors.initials: L
authors.lastname: Grave de Peralta