Research Highlights


Optically defined cavities in driven-dissipative photonic lattices

Optically defined cavities in driven-dissipative photonic lattices The engineering of localised modes in photonic structures is one of the main targets of modern photonics. An efficient strategy to design these modes is to use the interplay of constructive and destructive interference in periodic photonic lattices. This mechanism is at the origin of defect modes in photonic bandgaps, bound states in the continuum and compact localised states in flat bands. Here we show that in lattices of lossy resonators, the addition of external optical drives with controlled phase enlarges the possibilities of manipulating interference effects and allows designing novel types of localised modes. Using a honeycomb lattice of coupled micropillars resonantly driven with several laser spots at energies within its photonic bands we demonstrate the localisation of light in at-will geometries down to a single site. These localised modes can be seen as fully reconfigurable optical cavities with the potentiality of enhancing nonlinear effects and of controlling light-matter interactions with single site resolution.

O. Jamadi, B. Real, K. Sawicki, C. Hainaut, A. González-Tudela, N. Pernet, I. Sagnes, M. Morassi, A. Lemaître, L. Le Gratiet, A. Harouri, S. Ravets, J. Bloch, A. Amo
arXiv:2112.07753

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Polariton lasing and energy-degenerate parametric scattering in non-resonantly driven coupled planar microcavities

Polariton lasing and energy-degenerate parametric scattering in non-resonantly driven coupled planar microcavities Multi-level exciton-polariton systems offer an attractive platform for studies of non-linear optical phenomena. However, studies of such consequential non-linear phenomena as polariton condensation and lasing in planar microcavities have so far been limited to two-level systems, where the condensation takes place in the lowest attainable state. Here, we report non-equilibrium Bose–Einstein condensation of exciton-polaritons and low threshold, dual-wavelength polariton lasing in vertically coupled, double planar microcavities. Moreover, we find that the presence of the non-resonantly driven condensate triggers interbranch exciton-polariton transfer in the form of energy-degenerate parametric scattering. Such an effect has so far been observed only under excitation that is strictly resonant in terms of the energy and incidence angle. We describe theoretically our time-integrated and time-resolved photoluminescence investigations by an open-dissipative Gross–Pitaevskii equation-based model. Our platform’s inherent tunability is promising for construction of planar lattices, enabling three-dimensional polariton hopping and realization of photonic devices, such as all-optical polariton-based logic gates.

K. Sawicki, T. J. Sturges, M. Ściesiek, T. Kazimierczuk, K. Sobczak, A. Golnik, W. Pacuski, J. Suffczyński
et al. Nanophotonics 10(9), 2421-2429 (2021). Read more

Press release: FUW, UW

Krzysztof Sawicki

About




My research concerns the intersection of nonlinear photonics and condensed matter physics with the main focus on topics related to experimental studies of Bose-Einstein condensation of polaritons, polariton lasing from single and coupled microcavities and dynamics of exciton-polaritons, as well as spectroscopy of single magnetic dopants in self-assembled quantum dots.
More information: CV, Awards and Posters







Publications

2021

O. Jamadi, B. Real, K. Sawicki, C. Hainaut, A. González-Tudela, N. Pernet, I. Sagnes, M. Morassi, A. Lemaître, L. Le Gratiet, A. Harouri, S. Ravets, J. Bloch, A. Amo,
Optically defined cavities in driven-dissipative photonic lattices,
arXiv:2112.07753

M. Marciniak, T.-S. Chang, T.-C. Lu, F. Hjort, Å. Haglund, Ł. Marona, M. Gramala, P. Modrzyński, R. Kudrawiec, K. Sawicki, R. Bożek, W. Pacuski, J. Suffczyński, M. Gębski, A. Broda, J. Muszalski, J. A. Lott, T. Czyszanowski
Impact of stripe shape on the reflectivity of monolithic high contrast gratings,
ACS Photonics
 8, 11, 3173-3184 (2021).

K. Sawicki, T. J. Sturges, M. Ściesiek, T. Kazimierczuk, K. Sobczak, A. Golnik, W. Pacuski, J. Suffczyński
Polariton lasing and energy-degenerate parametric scattering in non-resonantly driven coupled planar microcavities,
Nanophotonics
 10(9), 2421-2429 (2021). Press release: FUW, UW


2020

M. Ściesiek, K. Sawicki, K. Sobczak, T. Kazimierczuk, A. Golnik, J. Suffczyński,
Long-Distance Coupling and Energy Transfer between Exciton States in Magnetically Controlled Microcavities,
Communications Materials
 1, 78 (2020).

K. Sawicki, M. Jurczak, W. Pacuski, J. Suffczyński,
Direct Interbranch Relaxation of Polaritons in a Microcavity with Embedded CdSe/(Cd,Mg)Se Quantum Wells,
Journal of Electronic Materials
 49, 4531–4536 (2020).


2019

K. Sawicki, J.-G. Rousset, R. Rudniewski, W. Pacuski, M. Ściesiek, T. Kazimierczuk, M. Nawrocki, J. Suffczyński,
Triple threshold lasing from a photonic trap in a Te/Se-based optical microcavity,
Communications Physics
 2, 38 (2019).

2017

W. Pacuski, J.-G. Rousset, V. Delmonte, T. Jakubczyk, K. Sobczak, J. Borysiuk, K. Sawicki, E. Janik, J. Kasprzak,
Antireflective photonic structure for coherent nonlinear spectroscopy of single magnetic quantum dots,
Crystal Growth & Design
 17, 2987–2992 (2017).

2016

J. Papierska, A. Ciechan, P. Bogusławski, M. Boshta, M. M. Gomaa, E. Chikoidze, Y. Dumont, A. Drabińska, H. Przybylińska, A. Gardias, J. Szczytko, A. Twardowski, M. Tokarczyk, G. Kowalski, B. Witkowski, K. Sawicki, W. Pacuski, M. Nawrocki, J. Suffczyński,
Fe dopant in ZnO: 2+ versus 3+ valency and ion-carrier s, p− d exchange interaction,
Physical Review B
 94, 224414 (2016).

2015

K. Gałkowski, P. Wojnar, E. Janik, J. Papierska, K. Sawicki, P. Kossacki, J. Suffczyński,
Exciton dynamics in individual semimagnetic (Zn,Mn)Te/(Zn,Mg)Te nanowires,
Journal of Applied Physics
 118, 095704 (2015).

K. Sawicki, F. K. Malinowski, K. Gałkowski, T. Jakubczyk, P. Kossacki, W. Pacuski, J. Suffczyński,
Single-color, in situ photolithography marking of individual CdTe/ZnTe quantum dots containing a single Mn2+ ion,
Applied Physics Letters
 106, 012101 (2015).

2013

J. Piwowar, J. Papierska, K. Sawicki, J. Kobak, W. Pacuski, A. Golnik, P. Kossacki, J. Suffczyński,
Optical properties of CdTe QDs in proximity to a Surface,
Acta Physica Polonica A
 124, 5 795-797 (2013).

Projects


PRELUDIUM (2018-2021)
Spectroscopy studies of a microcavity exciton-polaritons flow in II-VI semiconductors

National science centre poland

ETIUDA (2019-2020) 
Lasing from a single and coupled double polariton microcavities made of tellurides and selenides

National science centre poland

Contact

Dr Krzysztof Sawicki
Solid State Physics Division
Institute of Experimental Physics
Faculty of Physics University of Warsaw
Pasteura 5, 02-093 Warsaw, Poland


E-mail: krzysztof.sawicki(at)fuw.edu.pl