Photorefractive digital holographic microscopy applied in microstructures analysis

Brito, Isis Vasconcelos de; Gesualdi, Marcos R. R.; Ricardo, Jorge; Palácios, Francisco; Muramatsu, Mikiya; Valin, J.

doi:10.1016/j.optcom.2012.08.085

Cited by 17 publications

(22 citation statements)

References 26 publications

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“…3.2. Phase analysis of Airy-vortex beams using Digital Holography -The characterization of the phase distribution of this type of special beam has been made interferometric and holographic techniques [26,32,25,22,23,24]. Particularly in this work, the phase distribution was made via digital holography using the angular spectrum method.…”

Section: Experimental Generation and Analysis Of Airy-vortex Beams VImentioning

confidence: 99%

Generation and characterization of an array of Airy-vortex beams

Suarez

Neves

Gesualdi

2020

Optics Communications

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We present the experimental generation and analysis of both the intensity and phase of an optical vortex beam originating from a superposition of Airy-vortex beams. A new theoretical proposal is accessible to generate an array of Airy-vortex beams (AiVBs) from a superposition of N identical AiBs symmetrically located with respect to the propagation axis, where each beam is superimposed with OV and are characterized by the same topological charge l. Additionally, a single experimental apparatus enables both the optical generation and reconstruction of computer-generated holograms implemented on a spatial light modulator and its phase analysis by digital holography. The experimental results agreed with the theoretical predictions. The array of Airy-vortex beams has potential applications for trapping and rotating micro-particles in optical tweezers, modulation in optics communications, optical metrology, and others in optics and photonics. arXiv:1909.05031v1 [physics.optics]

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Section: Experimental Generation and Analysis Of Airy-vortex Beams VImentioning

confidence: 99%

Generation and characterization of an array of Airy-vortex beams

Suarez

Neves

Gesualdi

2020

Optics Communications

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“…The image reconstruction is performed by the HOLODIG program supported in MatLab©[12], using Double Propagation reconstruction algorithms [15].…”

Section: B Numerical Reconstruction By Digital Holographic Microscopymentioning

confidence: 99%

“…In this work, we present an apparatus in which the combination of the photorefractive Bi 12 TiO 20 (BTO) crystal in diffusion regime as holographic recording medium for writing-reading holographic image and numerical reconstruction by means of a digital holographic microscopy method [15]. We called Photorefractive Digital Holographic Microscopy (PRDHM) and this method allows us to obtain the amplitude and phase images of the micro-structured objects.…”

Section: Photorefractive Digital Holographicmentioning

confidence: 99%

“…For digital reconstruction, we will use the Double Propagation Method [15] which consists in two steps for wavefront reconstruction, the first propagation until the focal plane [12], Fig. 1(a), later on the complex amplitude of the diffraction pattern in this plane is calculated and it is done a new propagation process until the image plane Fig.…”

Section: B Numerical Reconstruction By Digital Holographic Microscopymentioning

confidence: 99%

“…The camera uses an array of 1024 × 768 pixels with pixel size of 4.65 μm and 24-bit scale output. An USB-2 cable connects the camera to the computer.The image reconstruction is performed by the HOLODIG program supported in MatLab©[12], using Double Propagation reconstruction algorithms [15]. …”

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confidence: 99%

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Photorefractive digital holographic microscopy: an application in the microdevices surfaces

Gesualdi

Brito

Ricardo

et al. 2013

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract-In this work, we present a Photorefractive Digital Holographic Microscopy (PRDHM) technique based on the writing-reading holographic process in photorefractive Bi 12 TiO 20 (BTO) crystal using the numerical reconstruction of the phase and amplitude image performed by a Digital Holographic Microscopy (DHM) method. We demonstrate that a holographic reconstructed image by diffraction process in photorefractive BTO crystal can be combined with a second reference beam to form a hologram in CCD plane in a DHM setup. The experimental results in a glass slide resolution target and thin film structure was obtained, where, amplitude, phase and 3D phase images are calculated performing digital reconstruction. This technique presents potentials possibilities to obtain 3D phase image of the microdevices for dynamic holography applications.Index Terms-holography; microscopy; non-destructive testing; photorefractive materials. I. INTRODUCTIONPhotorefractive holography is increasingly being used for quantitative measurements of the amplitude and phase of the objects waves in static and dynamic process [1][2][3][4][5][6][7]. In the photorefractive holography, the holographic recording medium is a photorefractive (PR) material. In PR crystals the holographic grating recording are characterized by following light-induced mechanisms: photorefractive (PR) effect, thermo-optic refractive index modulation or photochromic effect [1]. The PR effect consists on the refractive index modulation through charge carriers photo-induction and linear electro-optic effect; the refractive index modulation by thermo-optic effects is due to temperature gradients on the crystal surface; and the photochromic effect is caused by absorption coefficient modulation for high light intensities. These holographic recording materials present advantages like in situ self-processing of recording medium, indefinite reusability, high resolution and low response time. Moreover, PRCs do not present fatigue in dynamic and reversible processes. In Digital Holography by calculating the complex optical field of an image, the amplitude and phase of the optical field are available for direct manipulation [8][9][10][11][12]. The applications of digital holography to microscopy are particularly advantageous because a single hologram records the information of a three-dimensional object space. These advantages have been noted since early in the development of digital holography and applied to imaging analysis of microstructures and biological microscopy [9-12] using CCD sensor as holographic detector. In off-axis holography the angle of incidence of the reference beam is chosen so that when the hologram is reconstructed, the zero order light may be spatially separated from the diffracted holographic reconstruction. The method of offaxis holography involves a high spatial-frequency fringe pattern that must be sufficiently sampled by the CCD, the spatial resolution of the CCD is an important parameter.Recently, some works present the combination of the photorefractiv...

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Optical reconstruction of non-diffracting beams via photorefractive holography

et al. 2017

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This work presents, for the first time the optical generation of non-diffracting beams via photorefractive holography. Optical generation of non-diffracting beams using conventional optics components is difficult and, in some instances, unfeasible, as it is wave fields given by superposition of non-diffracting beams. It is known that computer generated holograms and spatial light modulators (SLMs) successfully generate such beams. With photorefractive holography technique, the hologram of a non-diffracting beam is constructed (recorded) and reconstructed (reading) optically in a nonlinear photorefractive medium. The experimental realization of a non-diffracting beam was made in a photorefractive holography setup using a photorefractive Bi12SiO20 (BSO) crystal as the holographic recording medium, where the non-diffracting beams, the Bessel beam arrays and superposition of co-propagating Bessel beams (Frozen Waves) were obtained experimentally. The experimental results are in agreement with the theoretically predicted results, presenting excellent prospects for implementation of this technique for dynamical systems at applications in optics and photonics.

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Photorefractive digital holographic microscopy applied in microstructures analysis

Cited by 17 publications

References 26 publications

Generation and characterization of an array of Airy-vortex beams

Generation and characterization of an array of Airy-vortex beams

Photorefractive digital holographic microscopy: an application in the microdevices surfaces

Optical reconstruction of non-diffracting beams via photorefractive holography

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