Guiding light through modes embedded in the radiation continuum

Result code in 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>

Alternative codes found

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

Result on the web

<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>

Result language

angličtina

Original language name

Guiding light through modes embedded in the radiation continuum

Original language description

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

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/LUABA24069" target="_blank" >LUABA24069: Hybrid tunable platforms for quantum nanophotonics</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Article name in the collection

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

ISBN

9781510688568

ISSN

0277-786X

e-ISSN

—

Number of pages

6

Pages from-to

"Roč. 13530 (2025)"

Publisher name

SPIE

Place of publication

Bellingham

Event location

Prague

Event date

Apr 8, 2025

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001541580000014