Abstract

A high-efficiency, ultrabroadband dielectric internal reflection grating with rhombus-shaped grooves is designed by a rigorous coupled-wave analysis, and an effective method for predicting spectral bandwidths of gratings from their efficiency maps is presented. The grating can be fabricated from a single dielectric material, and its reflection diffraction efficiency of the 1st order can reach more than 0.99. More importantly, an ultrabroadband top-hat diffraction spectrum with efficiency exceeding 0.98 over 170nm wavelength wide is achieved, which makes the gratings suitable for applications associated with broadband illumination, such as ultrashort pulses.

© 2011 Optical Society of America

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References

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2010 (1)

2007 (1)

2006 (1)

2005 (2)

2004 (1)

1999 (1)

M. S. D. Smith and K. A. McGreer, IEEE Photonics Technol. Lett. 11, 84 (1999).
[CrossRef]

1997 (1)

1995 (3)

Bi, Q.

Boyd, R. D.

Britten, J. A.

Cambril, E.

Chavel, P.

de Beaucoudrey, N.

Decker, D.

Durfee, C.

Gaudiosi, D. M.

Gaylord, T. K.

Gibson, E. A.

Grann, E. B.

Habraken, S.

Huff, R.

Jimenez, R.

Kane, S.

Kapteyn, H. C.

Laakkonen, P.

Lenaert, C.

Levola, T.

Lin, Z.

Marciante, J. R.

Mawet, D.

McGreer, K. A.

M. S. D. Smith and K. A. McGreer, IEEE Photonics Technol. Lett. 11, 84 (1999).
[CrossRef]

Miller, J. M.

Moharam, M. G.

Perry, M. D.

Pommet, D. A.

Raguin, D. H.

Riaud, P.

Shannon, C.

Shore, B. W.

Shults, E.

Smith, M. S. D.

M. S. D. Smith and K. A. McGreer, IEEE Photonics Technol. Lett. 11, 84 (1999).
[CrossRef]

Squier, J.

Sun, M.

Surdej, J.

Turunen, J.

Vandormael, D.

Xie, X.

Zhang, F.

Zhang, Y.

Zheng, J.

Zhou, C.

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Figures (5)

Fig. 1
Fig. 1

Schematic of a RIR grating (γ, slanted angle; p, period; d, etching depth; f, duty cycle; θ inc , incident angle; θ i , the ith-order diffraction angle).

Fig. 2
Fig. 2

Theoretical reflection efficiency of the 1 st order under TE-polarization illumination as a function of the ratios of groove depth and grating period to the designed wavelength for (a) TIR gratings; (b) RIR gratings etched into fused silica ( n 1 = 1.46 ). The incident angles are both 60 ° , and the duty cycles are 0.7.

Fig. 3
Fig. 3

Partial enlarged contour of the part in the white rectangle in Fig. 2b with diffraction efficiencies of 0.90, 0.94, and 0.98.

Fig. 4
Fig. 4

1 st diffraction efficiencies of the designed RIR gratings as a function of the incident wavelengths for different grating structures.

Fig. 5
Fig. 5

1 st diffraction efficiencies of the designed RIR grating as a function of the incident wavelengths under different refractive indices.

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