Proceedings ArticleDOI
Characterization of microstructures in lithium niobate crystals by digital holography
Sergio De Nicola,Pietro Ferraro,Andrea Finizio,Simonetta Grilli,Giuseppe Coppola,Mario Iodice,Giovanni Pierattini,M. Chiarini +7 more
- Vol. 4944, pp 353-360
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TLDR
In this article, the authors report on the application of Digital Holography as metrological tool for the inspection and characterization of the domain structures in bulk Lithium Niobate samples.Abstract:
Ferroelectric domain micro structuring of bulk Lithium Niobate is very useful for optoelectronic applications such as non-linear optics employing Quasi-Phase-Matching for efficient harmonic and parametric conversion processes or for the fabrication route for production of novel MEMS devices, like micro-cantilever beams. Quasi-Phase-Matching based applications require periodically reversed ferroelectric structures with periods of the order of micrometers. Precise control of the surface quality and of the domain structure of the micro structured materials is required such as in the case of optical MEMS applications. We here report on the application of Digital Holography as metrological tool for the inspection and characterization of the domain structures in bulk Lithium Niobate samples. This technique allows reconstructing both the intensity and the phase of the microstructures under test and it allows determining quantitatively the phase distribution. Several examples of application of the Digital Holography technique for the numerical reconstruction of the micro-topography of domain structure are presented and discussed.read more
Citations
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Journal ArticleDOI
Reversible Fragmentation and Self‐Assembling of Nematic Liquid Crystal Droplets on Functionalized Pyroelectric Substrates
Francesco Merola,Simonetta Grilli,Sara Coppola,Veronica Vespini,Sergio De Nicola,Pasquale Maddalena,Cosimo Carfagna,Pietro Ferraro +7 more
TL;DR: The Ferraro-ino Channel as mentioned in this paper is a channel dedicated to the Ferraroino Channel for Italian Conferences (http://www.ferro-ino-channel.it.org).
Journal ArticleDOI
Surface topography of microstructures in lithium niobate by digital holographic microscopy
S. De Nicola,Pietro Ferraro,Andrea Finizio,Simonetta Grilli,Giuseppe Coppola,Mario Iodice,P. De Natale,M. Chiarini +7 more
TL;DR: In this article, the application of holographic microscopy as a metrological tool for inspection and the micro-topography reconstruction of different microstructures fabricated in bulk lithium niobate by differential etching of reversed ferroelectric domain patterned crystals is reported.
Journal ArticleDOI
Experimental demonstration of the longitudinal image shift in digital holography
TL;DR: In this article, the presence of a plane parallel plate along the path of the object beam, such as a beamsplitter cube, often used in interferometers, affects the actual reconstruction distance.
Proceedings ArticleDOI
Interferometric analysis of a lithium niobate with engineering reversed domains
Marella de Angelis,Sergio De Nicola,Pietro Ferraro,Andrea Finizio,Simonetta Grilli,Giovanni Pierattini +5 more
TL;DR: In this article, an interferometric analysis of a 0.5mm-thick lithium niobate crystal sample was performed using a reflective grating interferometer and a digital holographic technique.
Proceedings ArticleDOI
Autofocus Method for Digital Holographic Reconstruction of Microscopic Object
Huaying Wang,Aili Qin,Min Huang +2 more
TL;DR: Three autofocusing evaluation functions, variance, Fourier spectrum and standard deviation correlation, are analyzed and demonstrated based on experimental investigation, and it is shown that there are better unimodality near the focused image plane for all the three autof focusing evaluation functions.
References
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Journal ArticleDOI
Digital holography for quantitative phase-contrast imaging.
TL;DR: A new application of digital holography for phase-contrast imaging and optical metrology and an application to surface profilometry shows excellent agreement with contact-stylus probe measurements.
Journal ArticleDOI
Simultaneous amplitude-contrast and quantitative phase-contrast microscopy by numerical reconstruction of Fresnel off-axis holograms
TL;DR: Off-axis holograms recorded with a magnified image of microscopic objects are numerically reconstructed in amplitude and phase by calculation of scalar diffraction in the Fresnel approximation to show that the transverse resolution is equal to the diffraction limit of the imaging system.
Journal ArticleDOI
Quasi-phase-matched optical parametric oscillators in bulk periodically poled LiNbO 3
TL;DR: In this article, the authors review progress in quasi-phase-matched optical parametric oscillators in bulk periodically poled LiNbO3, and demonstrate an oscillation threshold as low as 0.012 mJ with a Q-switched pump laser and pumping at greater than ten times threshold without damage.
Journal ArticleDOI
Three-dimensional microscopy with phase-shifting digital holography
Tong Zhang,Ichirou Yamaguchi +1 more
TL;DR: In this paper, the authors applied phase-shifting digital holography to microscopy by deriving the complex amplitude of light scattered from microscopic 3D objects through a microscope objective by video camera recording, phase shifting analysis, and computer reconstruction.
Journal ArticleDOI
Compensation of the inherent wave front curvature in digital holographic coherent microscopy for quantitative phase-contrast imaging
Pietro Ferraro,Sergio De Nicola,Andrea Finizio,Giuseppe Coppola,Simonetta Grilli,Carlo Magro,Giovanni Pierattini +6 more
TL;DR: An approach is proposed for removing the wavefront curvature introduced by the microscope imaging objective in digital holography, which otherwise hinders the phase contrast imaging at reconstruction planes and it is shown that a correction effect can be obtained at all reconstruction planes.