Large bandwidth, highly efficient optical gratings through high index materials

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Rathgen, Helmut and Offerhaus, H.L. (2009) Large bandwidth, highly efficient optical gratings through high index materials. Optics Express, 17 (6). pp. 4268-4283. ISSN 1094-4087

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Abstract:We analyze the diffraction characteristics of dielectric gratings that feature a high index grating layer, and devise, through rigorous numeri-cal calculations, large bandwidth, highly efficient, high dispersion dielectric gratings in reflection, transmission, and immersed transmission geometry. A dielectric TIR grating is suggested, whose −1dB spectral bandwidth is doubled as compared to its fused silica equivalent. The short wavelength diffraction efficiency is additionally improved by allowing for slanted lamella. The grating surpasses a blazed gold grating over the full octave. An immersed transmission grating is devised, whose −1dB bandwidth is tripled as compared to its fused silica equivalent, and that surpasses an equivalent classical transmission grating over nearly the full octave. A transmission grating in the classical scattering geometry is suggested, that features a buried high index layer. This grating provides effectively 100% diffraction efficiency at its design wavelegth, and surpasses an equivalent fused silica grating over the full octave.
Item Type:Article
Copyright:© 2009 Optical Society of America
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/72652
Official URL:http://dx.doi.org/10.1364/OE.17.004268
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