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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 10 — Nov. 8, 2013

Deterministic signal associated with a random field

Taewoo Kim, Ruoyu Zhu, Tan H. Nguyen, Renjie Zhou, Chris Edwards, Lynford L. Goddard, and Gabriel Popescu  »View Author Affiliations


Optics Express, Vol. 21, Issue 18, pp. 20806-20820 (2013)
http://dx.doi.org/10.1364/OE.21.020806


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Abstract

Stochastic fields do not generally possess a Fourier transform. This makes the second-order statistics calculation very difficult, as it requires solving a fourth-order stochastic wave equation. This problem was alleviated by Wolf who introduced the coherent mode decomposition and, as a result, space-frequency statistics propagation of wide-sense stationary fields. In this paper we show that if, in addition to wide-sense stationarity, the fields are also wide-sense statistically homogeneous, then monochromatic plane waves can be used as an eigenfunction basis for the cross spectral density. Furthermore, the eigenvalue associated with a plane wave, exp[i(krωt)] , is given by the spatiotemporal power spectrum evaluated at the frequency (k, ω). We show that the second-order statistics of these fields is fully described by the spatiotemporal power spectrum, a real, positive function. Thus, the second-order statistics can be efficiently propagated in the wavevector-frequency representation using a new framework of deterministic signals associated with random fields. Analogous to the complex analytic signal representation of a field, the deterministic signal is a mathematical construct meant to simplify calculations. Specifically, the deterministic signal associated with a random field is defined such that it has the identical autocorrelation as the actual random field. Calculations for propagating spatial and temporal correlations are simplified greatly because one only needs to solve a deterministic wave equation of second order. We illustrate the power of the wavevector-frequency representation with calculations of spatial coherence in the far zone of an incoherent source, as well as coherence effects induced by biological tissues.

© 2013 OSA

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.1670) Coherence and statistical optics : Coherent optical effects
(030.6600) Coherence and statistical optics : Statistical optics
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(290.5825) Scattering : Scattering theory

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: April 25, 2013
Revised Manuscript: July 31, 2013
Manuscript Accepted: August 1, 2013
Published: August 29, 2013

Virtual Issues
Vol. 8, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Taewoo Kim, Ruoyu Zhu, Tan H. Nguyen, Renjie Zhou, Chris Edwards, Lynford L. Goddard, and Gabriel Popescu, "Deterministic signal associated with a random field," Opt. Express 21, 20806-20820 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-21-18-20806


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References

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