Thick grating focussing-device-design using poynting-vector-optics |
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Authors: | P St J Russell |
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Institution: | (1) Department of Engineering Science, University of Oxford, Parks Road, Oxford, England |
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Abstract: | Novel thick grating focussing and de-focussing devices are described which employ uniform phase gratings with special boundary shapes. The analysis used is based upon an eigenmodal approach to Kogelnik's coupled-wave equations, akin to the dynamical theory of x-ray diffraction. The relationship between the direction of phase progression of the coupled-waves at Bragg incidence, and the direction of the Poynting vector is carefully delineated. As a consequence, a new technique-Poynting Vector Optics — is suggested as potentially an important means of designing thick gratings to fulfil certain beam processing roles, especially in integrated optics applications. The two-dimensional coupled-wave equations are briefly employed to illustrate the effectiveness of a particular focussing device. |
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Keywords: | 42 80 42 82 42 10 |
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