High Reflectance Multiple Step Metal Grating for Multichannel Reflector

Abstract

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.

References

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• P. Cheben, D. -X. Xu, S. Janz, and A. Delˆage, "Scaling down photonic waveguide devices on the SOI platform," in VLSI Circuits and Systems, vol. 5117 of Proceedings of SPIE, pp. 147– 156, Maspalomas, Spain, May 2003.
• 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.
• 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.
• 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.
• A. Densmore, D. -X. Xu, S. Janz, et al. , "Spiral-path highsensitivity silicon photonic wire molecular sensor with temperature-independent response," Optics Letters, vol. 33, no. 6, pp. 596–598, 2008.
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