The multiple step subwavelength metal grating with relief structure is designed and analyzed in which the profile of grating structure is having a relief structure with multiple steps. The optical presentation of traditional structure is evaluated and compared in terms of reflectivity over visible and ultra violet spectrum with the help of Opti-FDTD. It is shown that, near the ultra violet band multiple reflections can be found compared to traditional metal grating in the same parameters. With these characteristics, designed metal grating with multiple steps is expected to find applications in optical communication as multichannel reflector.

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24. Jing Nie,Hu-Quan Li and Wen Liu,,"Perfect Anomalous Absorption of TM Polarized Light in metallic grating situated in asymmetric surroundings," IEEE photonic journal,vol. 6,number 6,December 2014.
25. A. Densmore, D. -X. Xu, P. Waldron, et al. , "A silicon-oninsulator photonic wire based evanescent field sensor," IEEE Photonics Technology Letters, vol. 18, no. 23, pp. 2520–2522, 2006.
26. P. Cheben, J. H. Schmid, A. Delˆage, et al. , "A high-resolution silicon-on-insulator arrayed waveguide grating microspectrometer with sub-micrometer aperture waveguides," Optics Express, vol. 15, no. 5, pp. 2299–2306, 2007.
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Metal Grating Fdtd Multichannel Reflector.