Large bandwidth, highly efficient optical gratings through high index materials

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
Faculty:	Science and Technology (TNW)
Research Group:	Optical Sciences (OS)
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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