Abstract

We present the design, analysis and characterization of a polarization-independent tunable resonant grating filter. Polarization independence is achieved by setting the plane of incidence parallel to the grating grooves and optimizing the fill factor to obtain a strong reflection peak for all incident polarization states. Experimental measurements show that approximate angular insensitivity to the input polarization orientation concurrent with tunability over a wavelength range of roughly 1530 nm to 1560 nm is achieved. Modulation of the reflectivity peak shape with variations in the orientation of the incidence plane are observed, and found to be in qualitative agreement with theoretical predictions.

© 2005 Optical Society of America

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References

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  8. D. Lacour, PhD-thesis, �??Diffraction d'une onde plane par un guide périodique: application à la conception d'un filtre en longueur d'onde indépendant de la polarisation, �?? Université Blaise Pascal, Clermont Ferrand, France (2002).

Appl. Opt. (1)

Diffractive Optics 2003 (1)

G. Niederer and HP Herzig, �??Modeling polarization independent resonant grating filters,�?? Conference Digest, Diffractive Optics 2003, Oxford, UK.

J. Opt. Soc. Am. A (5)

Other (1)

D. Lacour, PhD-thesis, �??Diffraction d'une onde plane par un guide périodique: application à la conception d'un filtre en longueur d'onde indépendant de la polarisation, �?? Université Blaise Pascal, Clermont Ferrand, France (2002).

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Figures (4)

Fig. 1.
Fig. 1.

Polarization independent RGF, working around θ=45° angle of incidence (AOI) with a conical angle (α) of 90°. The grating fill factor is F=0.475. The refractive indices are nTa2O5=2.066, nSiO2=1.444, nGlass=1.51, and nAir=1.0.

Fig. 2.
Fig. 2.

Spectral reflectivity of the element shown in Fig. 1 for linearly polarized light. For (a) polarization angle ϕ=45° and AOI θ=45° with continuous variation of the fill factor and (b) three different AOIs θ, each with three different polarization angles ϕ, assuming a fill factor of F=0.475.

Fig. 3.
Fig. 3.

Dependence of the reflection peak on the conical angle α. (a) Theoretical curve for the device of Fig. 1, but with a grating fill factor of F=0.5 for incident p-polarization (ϕ=0°); (b) Measured spectral reflectivity of the fabricated device. The measured resonance wavelength is shifted towards longer wavelengths.

Fig. 4.
Fig. 4.

Measured spectral transmission for three different AOIs θ and three different polarization orientations ϕ.

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