Two-dimensional Fourier transform of scaled Dirac delta curves
JOSA A, Vol. 21, Issue 9, pp. 1682-1688 (2004)
http://dx.doi.org/10.1364/JOSAA.21.001682
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Abstract
We obtain a Fourier transform scaling relation to find analytically, numerically, or experimentally the spectrum of an arbitrary scaled two-dimensional Dirac delta curve from the spectrum of the nonscaled curve. An amplitude factor is derived and given explicitly in terms of the scaling factors and the angle of the forward tangent at each point of the curve about the positive x axis. With the scaling relation we determine the spectrum of an elliptic curve by a circular geometry instead of an elliptical one. The generalization to N-dimensional Dirac delta curves is also included.
© 2004 Optical Society of America
OCIS Codes
(000.4430) General : Numerical approximation and analysis
(050.1960) Diffraction and gratings : Diffraction theory
(070.2590) Fourier optics and signal processing : ABCD transforms
(350.5500) Other areas of optics : Propagation
Citation
Manuel Guizar-Sicairos and Julio C. Gutiérrez-Vega, "Two-dimensional Fourier transform of scaled Dirac delta curves," J. Opt. Soc. Am. A 21, 1682-1688 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-9-1682
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References
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- The proposed scaling theorem of Eq. (7) provides a very efficient way to draw an elliptic Dirac delta curve with constant amplitude in a square grid matrix. By solving for δ(f(αx, βy)) we obtain explicitly δ(f(αx, βy)) = H(x, y)F ^{−1} {G(u/α, v/β)}/|αβ|. It is known that the spectrum G of a circular delta is a zero-order Bessel function; thus the inverse fast Fourier transform of the scaled spectrum G(u/α, v/β) yields an elliptic Dirac delta curve whose amplitude is modulated by the factor h(x, y). The effect of multiplying by H(x, y) is to demodulate the Dirac delta curve such that now it has a constant amplitude.
- It is worth noting that the experimental setup shown in Fig. 5 is indeed the same arrangement commonly used to generate nondiffracting beams (Refs. 3, 4, and 9). We can then take the image of the spectrum not only in the Fourier plane but at any plane within the well-known propagation distance of the nondiffracting beam.
- J. C. Gutiérrez-Vega, M. D. Iturbe-Castillo, and S. Chávez-Cerda, “Alternative formulation for invariant optical fields: Mathieu beams,” Opt. Lett. 25, 1493–1495 (2000).
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- I. S. Gradshteyn and I. M. Ryzhik, Table of Integrals, Series, and Products (Academic, San Diego, Calif., 2000).
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