Mr. Khem N. Poudel Profile

Khem N. Poudel

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Proceedings Article | 27 February 2019 Presentation + Paper

Bloch surface wave excitation using a maximum length sequence grating structure

Khem Poudel, William Robertson

Proceedings Volume 10914, 109140K (2019) https://doi.org/10.1117/12.2508184

KEYWORDS: Refractive index, Reflectivity, Diffraction gratings, Dielectrics, Prisms, Phase matching, Optical design, Diffraction, Reflection

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The study of Bloch surface waves (BSWs) in dielectric multilayers has been useful in many applications in the fields of optics, photonics, and bio-sensing. BSW mode excitation can be achieved by the addition of a grating on the top of dielectric multilayer which provides phase matching between incident light and BSWs. However, grating coupling only provides coupling over a narrow angular range for incident monochromatic radiation. This paper reports work on realizing broadband coupling using maximum length sequence (MLS) grating structures. An MLS grating contains all possible combinations of a binary sequence save one; thus a grating with an MLS profile contains a superposition of a broad range of periods. We hypothesize that such a surface structure will permit coupling of a broad angular range of monochromatic light or a wide spectral range of collimated light into Bloch surface wave on a multilayer. We investigate the comparative spectral characteristics of MLS grating coupling with other single period counterparts. We believe our investigation provides a method to achieve efficient coupling of a higher fraction of incident light into BSWs than a single period grating or by using prism coupling.

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