Abstract

In this paper the frequency dependence and focusing performance in focal plane of a diffractive lens is analyzed by FDTD method at millimeter wavelengths. Binary lens and four-level lens are considered. The field distribution on the focal plane of the diffractive lens for the incident wave at different frequency is presented, which shows the frequency dependence and focusing performance of the lens.

© 2002 Optical Society of America

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References

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  1. J.C. Wiltse, J.E.Garrett, �??The Fresnel Zone Plate Antenna,�?? Microwave J. 34, 101-114 (1991).
  2. D.W. Prather, S. Shi, �??Formulation and application of the finite-difference time-domain method for the analysis of axially symmetric diffractive optical elements,�?? J. Opt. Soc. Am. A, 16, 1131-1142 (1999).
    [CrossRef]
  3. W.B. Dou, C. Wan, �??An analysis of diffractive lenses at millimeter wavelengths,�?? Microwave Opt. Technol. Lett. 31, 396-401 (2001).
    [CrossRef]
  4. W.B. Dou, E.K.N. Yung, �??Diffraction of an electromagnetic beam by an aperture in a conducting screen,�?? J. Opt. Soc. Am. A, 18, 801-806 (2001).
    [CrossRef]

J. Opt. Soc. Am. A

Microwave J.

J.C. Wiltse, J.E.Garrett, �??The Fresnel Zone Plate Antenna,�?? Microwave J. 34, 101-114 (1991).

Microwave Opt. Technol. Lett.

W.B. Dou, C. Wan, �??An analysis of diffractive lenses at millimeter wavelengths,�?? Microwave Opt. Technol. Lett. 31, 396-401 (2001).
[CrossRef]

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Figures (9)

Fig.1
Fig.1

configuration of the structure to be analyzed

Fig.2
Fig.2

diagram of the Binary lens

Fig.3
Fig.3

The contour pattern of the diffraction field of the binary lens at different time

Fig.4
Fig.4

Bandwidth performance of the lens. 1-Ez (360,185), 2-Ez (360,200), 3-Ez (360,250)

Fig.5
Fig.5

diffraction field distribution in the focal plane for different frequencies

Fig.6
Fig.6

The contour pattern of the diffraction field the four-level lens at different time

Fig.7
Fig.7

Diffraction field distribution along foal plane in the band from 70GHz to 120 GHz.

Fig.8
Fig.8

The power density of the diffraction field at the focal point in band from 70 GHz to 120 GHz

Fig.9
Fig.9

the power density of the diffraction field in the focal plane for the different frequencies

Tables (1)

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Table 1 outer radius of the nth zone

Equations (2)

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u = cos ( 2 π f c ndt ) exp ( ndt t 0 T 2 ) , T = 70 dt , t 0 = 3 T
f c = 94 GHz , λ = c / f c , ds = λ / 20 , dt = ds / 2 c

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