Bloch surface wave excitation using a maximum length sequence grating structure

Khem N. Poudel; William M. Robertson

doi:10.1117/12.2508184

27 February 2019 Bloch surface wave excitation using a maximum length sequence grating structure

Khem N. Poudel, William M. Robertson

Proceedings Volume 10914, Optical Components and Materials XVI; 109140K (2019) https://doi.org/10.1117/12.2508184
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

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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Citation Download Citation

Khem N. Poudel and William M. Robertson "Bloch surface wave excitation using a maximum length sequence grating structure", Proc. SPIE 10914, Optical Components and Materials XVI, 109140K (27 February 2019); https://doi.org/10.1117/12.2508184

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