Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Haissam Hanafi"'
Publikováno v:
APL Photonics, Vol 7, Iss 11, Pp 111301-111301-5 (2022)
Photonic lattices have emerged as an ideal testbed for localizing light in space. Among others, the most promising approach is based on flat band systems and their related nondiffracting compact localized states. So far, only compact localized states
Externí odkaz:
https://doaj.org/article/afa3c4d2e4fd4835b423a1df11729e19
Publikováno v:
Physical Review A. 107
The Lieb lattice and the kagome lattice, which are both well known for their Dirac cones and flat bands, can be continuously converted into each other by a shearing transformation. During this transformation, the flat band is destroyed, but the Dirac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7323fd33d70f23f2319ed51b186a59a
https://doi.org/10.1103/physreva.107.023509
https://doi.org/10.1103/physreva.107.023509
Publikováno v:
Optics express. 30(22)
Engineered domain structures play an essential role in nonlinear optics for quasi-phase-matched parametric processes. Pyroelectric field-assisted domain inversion with focused femtosecond laser pulses is a promising approach to create arbitrary two-d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::c9bfe4187676f2d966dc8058e7fbf328
https://pubmed.ncbi.nlm.nih.gov/36298888
https://pubmed.ncbi.nlm.nih.gov/36298888
Publikováno v:
Optica Advanced Photonics Congress 2022.
We report on topologically protected edge states in a four-band Lieb-like pho-tonic lattice of evanescently coupled helical waveguides. Our results demonstrate adjustable group velocities and oscillatory modal weight exchange depending on the edge te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec3dd44af11f74415e70ce350af1166e
https://doi.org/10.1364/np.2022.npm2e.2
https://doi.org/10.1364/np.2022.npm2e.2
Publikováno v:
2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC).
In 2016, F.D. Haldane, D.J. Thouless and J.M. Kosterlitz received the Nobel prize for their pioneering research in the field of topological phases of matter. Ever since, researchers have been fascinated by the extraordinary properties arising from to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc751c2d94ee8a01a06dd7d2dc1d42ed
https://doi.org/10.1109/cleo/europe-eqec52157.2021.9542485
https://doi.org/10.1109/cleo/europe-eqec52157.2021.9542485
Publikováno v:
Advanced Optical Materials. 10:2270034
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::beeedb379a7fd64ceaa04c39c0cb5b9a
https://doi.org/10.1002/adom.202270034
https://doi.org/10.1002/adom.202270034
We report on singular and nonsingular flat bands in a Sierpinski fractal-like photonic lattice. We demonstrate that the the lowest two bands, being isolated and degenerate due to geometrical frustration, are nonsingular and thus can be spanned by a c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::79bf267669257eeed2f58ed8107c5b1f
Publikováno v:
OSA Nonlinear Optics 2021.
We demonstrate light localization in a frustrated fractal-like photonic lattice owing multiple flat bands fabricated by femtosecond direct laser writing. We investigate the arising flat bands depending on the singularities of their Bloch wave functio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::02903320ea22e6dcb3ec71556730987d
https://doi.org/10.1364/nlo.2021.nm2a.6
https://doi.org/10.1364/nlo.2021.nm2a.6
Publikováno v:
OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF).
Ferroelectric domains are fabricated by patterning lithium niobate and lithium tantalate crystals with femtosecond laser pulses and subsequent heating to elevated temperatures. We investigate the role of temperature on the domain inversion process.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50bb52ceb7b542e4a1cf04c2a4fef4af
https://doi.org/10.1364/np.2020.npm4d.5
https://doi.org/10.1364/np.2020.npm4d.5
Publikováno v:
OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF).
We fabricate photonic twisted bilayer graphene superlattices by nonlinear induction using complex light. Exciting a single set of Dirac points reveals chiral light with rotating intensity spirals in the vicinity of the magic angle.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4065fa9de8f5449cc13bef2471e86cc9
https://doi.org/10.1364/np.2020.npw1e.1
https://doi.org/10.1364/np.2020.npw1e.1