Guiding light through modes embedded in the radiation continuum

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985882%3A_____%2F25%3A00648240" target="_blank" >RIV/67985882:_____/25:00648240 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/25:00384409 RIV/00216305:26620/26:0199462

Výsledek na webu

<a href="https://doi.org/10.1117/12.3056433" target="_blank" >https://doi.org/10.1117/12.3056433</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.3056433" target="_blank" >10.1117/12.3056433</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Guiding light through modes embedded in the radiation continuum

Popis výsledku v původním jazyce

The concept of bound states in the continuum (BICs), introduced nearly 90 years ago in quantum physics as a theoretical construction, has become the subject of an intensive investigation in the realm of photonics. In this talk, we report on our recent studies on BICs which appear in the photonic waveguides. The propagating BICs are usually observed in waveguides that exhibit the effect of lateral leakage. However, the states have some limitations: They are localized in or in the vicinity of high-refractive-index materials, they are observed as quasi-TM polarized waves, and they appear only for certain 'magic'sets of parameters. Here, we focus on two systems that enable alternative mechanisms of BIC formation. In contrast to the previously described configurations, the first geometry, consisting of a rectangular waveguide coupled to a planar waveguide, facilitates genuine guiding of quasi-TE modes in the core with the lower refractive index. The TE BICs appear when the coupling between the bound and radiation modes is suppressed due to accidental orthogonality of modes. The second system, proton exchanged waveguide in Z-cut thin-film lithium niobate, can support very low-loss TMpolarized quasi-BIC modes for a range of waveguide widths not limited to 'magic widths'. This is because the system exhibits a very small change of the ordinary refractive index between the core and substrate, which enables formation of polarization-protected quasi-BICs. We believe that the presented approaches well illustrate rich physics associated with BICs and offer new possibilities in their technical applications

Název v anglickém jazyce

Guiding light through modes embedded in the radiation continuum

Popis výsledku anglicky

The concept of bound states in the continuum (BICs), introduced nearly 90 years ago in quantum physics as a theoretical construction, has become the subject of an intensive investigation in the realm of photonics. In this talk, we report on our recent studies on BICs which appear in the photonic waveguides. The propagating BICs are usually observed in waveguides that exhibit the effect of lateral leakage. However, the states have some limitations: They are localized in or in the vicinity of high-refractive-index materials, they are observed as quasi-TM polarized waves, and they appear only for certain 'magic'sets of parameters. Here, we focus on two systems that enable alternative mechanisms of BIC formation. In contrast to the previously described configurations, the first geometry, consisting of a rectangular waveguide coupled to a planar waveguide, facilitates genuine guiding of quasi-TE modes in the core with the lower refractive index. The TE BICs appear when the coupling between the bound and radiation modes is suppressed due to accidental orthogonality of modes. The second system, proton exchanged waveguide in Z-cut thin-film lithium niobate, can support very low-loss TMpolarized quasi-BIC modes for a range of waveguide widths not limited to 'magic widths'. This is because the system exhibits a very small change of the ordinary refractive index between the core and substrate, which enables formation of polarization-protected quasi-BICs. We believe that the presented approaches well illustrate rich physics associated with BICs and offer new possibilities in their technical applications

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

<a href="/cs/project/LUABA24069" target="_blank" >LUABA24069: Hybridní laditelné platformy pro kvantovou nanofotoniku</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of SPIE-INTEGRATED OPTICS: DESIGN, DEVICES, SYSTEMS, AND APPLICATIONS VIII

ISBN

9781510688568

ISSN

0277-786X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

"Roč. 13530 (2025)"

Název nakladatele

SPIE

Místo vydání

Bellingham

Místo konání akce

Prague

Datum konání akce

8. 4. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001541580000014