Abstract

A pair of planar reflection gratings is proposed and discussed for use in a color-splitting and imaging system, such as a projection-type color-scanner head. Red, green, and blue light reflected from a color subject are split by a color-splitting grating lens and imaged by an image-correction grating, consisting of three segments, onto three line sensors arranged in parallel. The phase-shift function of the image-correction grating was optimized for each color by numerical iteration with the ray-tracing method to suppress aberrations resulting from the wide view angle and the three different wavelengths. Gratings were designed and fabricated, and aberration suppression was experimentally confirmed.

© 2001 Optical Society of America

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References

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  1. A. H. Firester, “Properties and fabrication of micro Fresnel zone plates,” Appl. Opt. 12, 1698–1702 (1973).
    [CrossRef] [PubMed]
  2. H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
    [CrossRef]
  3. T. Fujita, H. Nishihara, J. Koyama, “Fabrication of microlenses using electron-beam lithography,” Opt. Lett. 6, 613–615 (1981).
    [CrossRef] [PubMed]
  4. S. Ura, T. Sasaki, H. Nishihara, “A pair of gratings for color splitting and imaging systems,” in Diffractive Optics and Micro-Optics, Vol. 41 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2000), paper DThD3, pp. 333–335.
  5. T. Shiono, M. Kitagawa, K. Setsune, T. Mitsuyu, “Reflection micro-Fresnel lenses and their use in an integrated focus sensor,” Appl. Opt. 28, 3434–3442 (1989).
    [CrossRef] [PubMed]

1989 (1)

1981 (1)

1975 (1)

H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
[CrossRef]

1973 (1)

Firester, A. H.

Fujita, T.

Inohara, S.

H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
[CrossRef]

Kitagawa, M.

Koyama, J.

T. Fujita, H. Nishihara, J. Koyama, “Fabrication of microlenses using electron-beam lithography,” Opt. Lett. 6, 613–615 (1981).
[CrossRef] [PubMed]

H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
[CrossRef]

Mitsuyu, T.

Nishihara, H.

T. Fujita, H. Nishihara, J. Koyama, “Fabrication of microlenses using electron-beam lithography,” Opt. Lett. 6, 613–615 (1981).
[CrossRef] [PubMed]

H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
[CrossRef]

S. Ura, T. Sasaki, H. Nishihara, “A pair of gratings for color splitting and imaging systems,” in Diffractive Optics and Micro-Optics, Vol. 41 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2000), paper DThD3, pp. 333–335.

Sasaki, T.

S. Ura, T. Sasaki, H. Nishihara, “A pair of gratings for color splitting and imaging systems,” in Diffractive Optics and Micro-Optics, Vol. 41 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2000), paper DThD3, pp. 333–335.

Setsune, K.

Shiono, T.

Suhara, T.

H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
[CrossRef]

Ura, S.

S. Ura, T. Sasaki, H. Nishihara, “A pair of gratings for color splitting and imaging systems,” in Diffractive Optics and Micro-Optics, Vol. 41 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2000), paper DThD3, pp. 333–335.

Appl. Opt. (2)

IEEE J. Quantum Electron. (1)

H. Nishihara, S. Inohara, T. Suhara, J. Koyama, “Holocoupler: a novel coupler for optical circuits,” IEEE J. Quantum Electron. QE-11, 794–796 (1975).
[CrossRef]

Opt. Lett. (1)

Other (1)

S. Ura, T. Sasaki, H. Nishihara, “A pair of gratings for color splitting and imaging systems,” in Diffractive Optics and Micro-Optics, Vol. 41 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2000), paper DThD3, pp. 333–335.

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Figures (8)

Fig. 1
Fig. 1

Schematic view of the proposed configuration of color-splitting and imaging optics.

Fig. 2
Fig. 2

Cross-sectional view of the CSGL with the incident and the diffracted waves.

Fig. 3
Fig. 3

Calculated point spreads obtained with the CSGL on the x′–y′ focal plane for waves that diverge from points located at x i = -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10 mm on the readout line. The top point-spread curve represents λ B = 430 nm; the middle curve, λ G = 515 nm; and the bottom curve, λ R = 630 nm.

Fig. 4
Fig. 4

Cross-sectional view of a pair of gratings with the incident and the diffracted waves.

Fig. 5
Fig. 5

Calculated point spreads obtained with the CSGL in the x ICy IC ICG plane for waves that diverge from points located at x i = -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10 mm on the readout line. The top point-spread curve represents λ B ; the middle curve, λ G ; and the bottom curve, λ R .

Fig. 6
Fig. 6

Calculated examples of point spreads on the image-sensor plane for waves that diverge from points located at x i = -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10 mm on the readout line. The top, middle, and bottom point-spread curves represent λ B , λ G , and λ R , respectively.

Fig. 7
Fig. 7

Microphotographs of the fabricated ICG.

Fig. 8
Fig. 8

Focused-spot images and intensity profiles on the image plane for λ G waves launched from (a) the center x i = 0 mm and (b) the end x i = 10 mm of the readout line. The scale is 10 µm/division.

Equations (3)

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x2+y+fIN sin θIN2+fIN cos θIN21/2+x2+y2+fCS21/2=mλCS+constant.
2πλcos θIN+cos θDFdCS =π,
ϕIC=2πλxIC2+yIC-yP2+zP21/2-xIC2+yIC-yQ2+zQ21/2+i=08j=08-1 CijxICiyICj,

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