"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Diffractive patterns correlation with shape and structure of imprint objects

M. MIHAILESCU1,* , A. PREDA1, D. COJOC2, E. SCARLAT1, L. PREDA1

Affiliation

  1. Physics Department, University “Politehnica” of Bucharest, Romania
  2. TASC-NNL-INFM (National Institute for the Physics of Matter) at Elettra Synchrotron Light Source, Lilit Beam-line, Trieste, Italy

Abstract

Analysis of optical diffractive pattern of natural or virtual objects is an actually problem which has important applications. We realized the correlation between diffractive patterns from imprinted objects with different shapes, structures and sizes. An iterative algorithm based on Fourier transform for far field written in MATLAB is used to design computer generated hologram (CGH) in a different number of equidistant phase-levels patterns, which produces the desired image in far field. Spatial light modulators (SLM), two-dimensional electrically addressable devices, are used in experimental setup in order to modulate the phase of a wave front from a monochromatic plane wave. Through the diffractive pattern obtained experimentally with CGH and SLM, we show that the shape of the objects is of less importance than the structure. The shape is modified by different geometrical figures, and the structure is periodical, with or without defects. We use this method to study different imprint objects. By correlation profile we remark the distinction in the shape and structure of different sample..

Keywords

Computer generated holography, Correlation function, Diffractive pattern, Spatial light modulator, Imprint objects.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

M. MIHAILESCU, A. PREDA, D. COJOC, E. SCARLAT, L. PREDA, Diffractive patterns correlation with shape and structure of imprint objects, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 1071-1076 (2007)