An array generator based on the fractional Talbot effect for Gaussian beams

Smolyaninov, Alexi

doi:10.1016/s0030-4018(96)00467-1

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…this solution allows to obtain a more compact device whose performance can be evaluated by taking into account also other array generators proposed in literature [9][IO].…”

Section: Architecture and Operation Principlementioning

confidence: 99%

<title>New architecture of integrated optical data preprocessor</title>

Armenise

Diana

1998

SPIE Proceedings

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A large amount of data are usually trasmitted, stored and processed by big digital systems in satellite remote sensing applications. To alleviate this situation, an on-board data processing system can be of significant help if it allows only the useful information data be trasmitted to the ground station. To this end, a new architecture of a LiNbO3 integrated optic pre-processor is proposed in this paper. Its operation is based on the holographic substraction between two incident waves and depends on the relative phase shift. In such a way on-board identification and classification ofdata are allowed. The proposed device is formed by channel-planar composite waveguides to increase the number of parallel channels. Channel waveguides, which can be excited through a micnolens array, allow to obtain the best performance of the electrooptic modulators, each of them is placed on a single channel waveguide, in terms of low losses and high modulation efficiency.

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“…this solution allows to obtain a more compact device whose performance can be evaluated by taking into account also other array generators proposed in literature [9][IO].…”

Section: Architecture and Operation Principlementioning

confidence: 99%

<title>New architecture of integrated optical data preprocessor</title>

Armenise

Diana

1998

SPIE Proceedings

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Experimental realization of Talbot array illumination for a 2-dimensional phase grating

Mondal

Kumar

Tiwari

et al. 2016

Journal of Applied Physics

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We present the result of a multiple phase level Talbot array illuminator (TAI) based on two dimensional phase grating. The grating was fabricated on glass by a Deep Reactive Ion Etching (DRIE) system with optimized gas combination recipe. The opening ratio of the grating is ∼0.71 with a phase step of 11π. The experimental study on Talbot array illuminations (TAI's) of this fabricated device in near-field region was carried out using a He-Ne laser. The TAI's were observed at the positions 2.81 mm, 8.59 mm, 14.28 mm, and 20.57 mm along the light propagation direction. The computer simulations of wave field distribution in near field region at different fractional Talbot distances have been generated. These simulated results are in reasonably good agreement with our experimental observed results. Our analysis on Talbot array illumination (TAI's) shows that the multiple harmonic phase modulations are transformed into intensity modulations at 1/8, 3/8, 5/8, and 7/8 fractional Talbot position. We have observed three different grating images, viz., attenuated, phase contrast, and diffraction contrast images. We also show the presence of a considerable amount of phase change at the edge of each phase sublevel that enhances the contrast of differential phase contrast imaging. Therefore, the phase contrast signal can be detected at a fractional position using single phase grating without the need of phase stepping.

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An array generator based on the fractional Talbot effect for Gaussian beams

Cited by 2 publications

References 5 publications

<title>New architecture of integrated optical data preprocessor</title>

<title>New architecture of integrated optical data preprocessor</title>

Experimental realization of Talbot array illumination for a 2-dimensional phase grating

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