Possibilities of Bragg filtering structures based on subwavelength grating guiding mechanism

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F17%3A00319287" target="_blank" >RIV/68407700:21340/17:00319287 - isvavai.cz</a>

Result on the web

<a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10242/1/Possibilities-of-Bragg-filtering-structures-based-on-subwavelength-grating-guiding/10.1117/12.2266002.short" target="_blank" >https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10242/1/Possibilities-of-Bragg-filtering-structures-based-on-subwavelength-grating-guiding/10.1117/12.2266002.short</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2266002" target="_blank" >10.1117/12.2266002</a>

Result language

angličtina

Original language name

Possibilities of Bragg filtering structures based on subwavelength grating guiding mechanism

Original language description

Silicon-on-insulator (SOI), as the most promising platform, for advanced photonic integrated structures, employs a high refractive index contrast between the silicon “core” and surrounding media. One of the recent new ideas within this field is based on the alternative formation of the subwavelength sized (quasi)periodic structures. Such structures relay on Bloch wave propagation concept, in contrast to standard index guiding mechanism. Soon after the invention of such subwavelength grating (SWG) waveguides, the scientists concentrated on various functional elements. Our contribution is devoted to a detailed numerical analysis and design considerations of Bragg filtering structures based on SWG idea. Based on our previous studies where we have shown impossibility of application of various 2 and “2.5” dimensional methods for the proper numerical analysis, we effectively use two independent in-house approaches based on 3D Fourier modal methods, namely aperiodic rigorous coupled wave analysis and bidirectional expansion and propagation method based on Fourier series tools. As it was recently demonstrated, SWG Bragg filters are feasible. Based on this idea, we propose, simulate, and optimize spectral characteristics of such filters. In particular, we have investigated several possibilities of modifications of original SWG waveguides towards the Bragg filtering, including firstly - simple single-segment changes in position, thickness, and width, and secondly - several types of Si inclusions, in terms of perturbed width and thickness (and their combinations). The leading idea was to obtain required narrow spectral characteristic while keeping the minimum size of Si features large enough. We have found that the second approach with the single element perturbations can provide promising designs. Furthermore, even more complex filtering SWG structures can be considered.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/GA16-00329S" target="_blank" >GA16-00329S: Novel effects and functionalities in subwavelength guided-wave photonic structures</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů