Possibilities of Bragg filtering structures based on subwavelength grating guiding mechanism

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Possibilities of Bragg filtering structures based on subwavelength grating guiding mechanism

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Possibilities of Bragg filtering structures based on subwavelength grating guiding mechanism

Popis výsledku anglicky

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.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

<a href="/cs/project/GA16-00329S" target="_blank" >GA16-00329S: Nové efekty a funkcionality v subvlnových vlnovodných fotonických strukturách</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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