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Proceedings Paper

Non-steady-state photo-EMF effect induced by an arbitrary 1-D periodical light distribution
Author(s): Ileana Guízar-Iturbide; Luis Gerardo de la Fraga; Ponciano Rodríguez-Montero; Svetlana Mansurova
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Paper Abstract

The detectors based on non-steady-state photo-electromotive force (p-EMF) effect, induced in a photoconductor by an oscillating light pattern, have been proposed recently for localization of self-images generated by a periodical object in real time and without any image processing. Here, we present the detailed theoretical analysis of the p- EMF effect induced by an arbitrary 1-D periodical light pattern. Analytical expression for p-EMF current density in a case of light distribution containing only odd harmonics is derived. In order to illustrate our results, axial dependence of the photo-EMF signal induced by patterns generated in near field by the diffraction on a binary grating was simulated numerically. Our results demonstrated, that the optimum regime for the localization of selfimages using the p-EMF based detector is when the fundamental spatial harmonic of the light pattern is smaller than the inverse of the diffusion length of the charge carriers, being the p-EMF current proportional to the sum of the squares of the spatial harmonics visibilities.

Paper Details

Date Published: 3 August 2010
PDF: 8 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 779011 (3 August 2010); doi: 10.1117/12.860790
Show Author Affiliations
Ileana Guízar-Iturbide, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Luis Gerardo de la Fraga, Ctr. de Investigación y de Estudios Avanzados (Mexico)
Ponciano Rodríguez-Montero, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Svetlana Mansurova, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)


Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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