Rafał Mirek
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View article: Room-temperature cavity exciton-polariton condensation in perovskite quantum dots
Room-temperature cavity exciton-polariton condensation in perovskite quantum dots Open
The exploitation of the strong light-matter coupling regime and exciton-polariton condensates has emerged as a compelling approach to introduce strong interactions and nonlinearities into numerous photonic applications. The use of colloida…
View article: In situ tunable, room-temperature polariton condensation in individual states of a 1D topological lattice
In situ tunable, room-temperature polariton condensation in individual states of a 1D topological lattice Open
Exciton-polariton microcavity arrays have emerged as a promising semiconductor-based platform for analog simulations of model Hamiltonians and topological effects. To study a variety of Hamiltonians and investigate their properties, it is …
View article: Room-temperature cavity exciton-polariton condensation in perovskite quantum dots
Room-temperature cavity exciton-polariton condensation in perovskite quantum dots Open
The exploitation of the strong light-matter coupling regime and exciton-polariton condensates has emerged as a compelling approach to introduce strong interactions and nonlinearities into numerous photonic applications, ranging from low-th…
View article: In-situ tunneling control in photonic potentials by Rashba-Dresselhaus spin-orbit coupling
In-situ tunneling control in photonic potentials by Rashba-Dresselhaus spin-orbit coupling Open
The tunability of individual coupling amplitudes in photonic lattices is highly desirable for photonic Hamiltonian engineering and for studying topological transitions in situ. In this work, we demonstrate the tunneling control between ind…
View article: In-situ tunable, room-temperature polariton condensation in individual states of a 1D topological lattice
In-situ tunable, room-temperature polariton condensation in individual states of a 1D topological lattice Open
In recent years, exciton-polariton microcavity arrays have emerged as a promising semiconductor-based platform for analogue simulations of model Hamiltonians and topological effects. To realize experimentally a variety of Hamiltonians and …
View article: Magneto-optical induced supermode switching in quantum fluids of light
Magneto-optical induced supermode switching in quantum fluids of light Open
The insensitivity of photons towards external magnetic fields forms one of the hardest barriers against efficient magneto-optical control, aiming at modulating the polarization state of light. However, there is even scarcer evidence of mag…
View article: Natural exceptional points in the excitation spectrum of a light–matter system
Natural exceptional points in the excitation spectrum of a light–matter system Open
In this work, we observe natural exceptional points in the excitation spectrum of an exciton–polariton system by optically tuning the light–matter interactions. The observed exceptional points do not require any spatial or polarization deg…
View article: Natural exceptional points in the excitation spectrum of a light-matter system
Natural exceptional points in the excitation spectrum of a light-matter system Open
We observe natural exceptional points in the excitation spectrum of an exciton-polariton system by optically tuning the light-matter interactions. The observed exceptional points do not require any spatial or polarization degrees of freedo…
View article: Magneto-optical induced supermode switching in quantum fluids of light
Magneto-optical induced supermode switching in quantum fluids of light Open
The insensitivity of photons towards external magnetic fields forms one of the hardest barriers against efficient magneto-optical control, aiming at modulating the polarization state of light. However, there is even scarcer evidence of mag…
View article: Inverted optical bistability and optical limiting in coherently driven exciton–polaritons
Inverted optical bistability and optical limiting in coherently driven exciton–polaritons Open
Exciton–polaritons in optical cavities exhibit strong nonlinearities predominantly because of the third-order Kerr-like interactions mediated by the excitonic component. Under quasi-resonant excitation, depending on the energy of the incid…
View article: Leaky Integrate‐and‐Fire Mechanism in Exciton–Polariton Condensates for Photonic Spiking Neurons (Laser Photonics Rev. 17(1)/2023)
Leaky Integrate‐and‐Fire Mechanism in Exciton–Polariton Condensates for Photonic Spiking Neurons (Laser Photonics Rev. 17(1)/2023) Open
Neuromorphic Photonics In article number 2100660, Krzysztof Tyszka, Barbara Piętka, and colleagues introduce a new approach to neuromorphic photonics which employs the dynamics of strong exciton-photon interaction to imitate the most funda…
View article: Leaky Integrate‐and‐Fire Mechanism in Exciton–Polariton Condensates for Photonic Spiking Neurons
Leaky Integrate‐and‐Fire Mechanism in Exciton–Polariton Condensates for Photonic Spiking Neurons Open
This paper introduces a new approach to neuromorphic photonics in which microcavities exhibiting strong exciton–photon interaction may serve as building blocks of optical spiking neurons. The experimental results demonstrate the intrinsic …
View article: Neural networks based on ultrafast time-delayed effects in exciton-polaritons
Neural networks based on ultrafast time-delayed effects in exciton-polaritons Open
We demonstrate that time-delayed nonlinear effects in exciton-polaritons can be used to construct neural networks where information is coded in optical pulses arriving consecutively on the sample. The highly nonlinear effects are induced b…
View article: Energy-Efficient Neural Network Inference with Microcavity Exciton Polaritons
Energy-Efficient Neural Network Inference with Microcavity Exciton Polaritons Open
We propose all-optical neural networks characterized by very high energy efficiency and performance density of inference. We argue that the use of microcavity exciton-polaritons allows to take advantage of the properties of both photons an…
View article: Neuromorphic Binarized Polariton Networks
Neuromorphic Binarized Polariton Networks Open
The rapid development of artificial neural networks and applied artificial intelligence has led to many applications. However, current software implementation of neural networks is severely limited in terms of performance and energy effici…
View article: Exciton-polaritons in multilayer WSe <sub>2</sub> in a planar microcavity
Exciton-polaritons in multilayer WSe <sub>2</sub> in a planar microcavity Open
Due to high binding energy and oscillator strength, excitons in thin flakes\nof transition metal dichalcogenides constitute a perfect foundation for\nrealizing a strongly coupled light-matter system. In this paper we investigate\nmono- and…
View article: Giant spin Meissner effect in a nonequilibrium exciton-polariton gas
Giant spin Meissner effect in a nonequilibrium exciton-polariton gas Open
The suppression of Zeeman energy splitting due to spin-dependent interactions\nwithin a Bose-Einstein condensate (the spin Meissner effect) was predicted to\noccur up to a certain value of magnetic field strength. We report a clear\nobserv…
View article: Optical pump – THz probe response of VO<sub>2</sub> under high pressure
Optical pump – THz probe response of VO<sub>2</sub> under high pressure Open
We present the ultrafast THz response of VO2 under high pressures. A clear anomaly is observed around 8 GPa indicating a pressure-induced phase transition. Our observations can be interpreted in terms of a bandwidth-controlled Mott-Hubbard…
View article: Ultrafast response of photoexcited carriers in VO<sub>2</sub> at high-pressure
Ultrafast response of photoexcited carriers in VO<sub>2</sub> at high-pressure Open
We utilize near-infrared pump—mid-infrared probe spectroscopy to investigate the ultrafast electronic response of pressurized VO2. A clear anomaly in the linear mid-infrared response as well as in the fluence dependence of the pump–probe s…
View article: Magnetic field effect on the lasing threshold of a semimagnetic polariton condensate
Magnetic field effect on the lasing threshold of a semimagnetic polariton condensate Open
We evidence magnetic field triggered polariton lasing in a microcavity\ncontaining semimagnetic quantum wells. This effect is associated with a\ndecrease of the polariton lasing threshold power in magnetic field. The\nobserved magnetic fie…
View article: Ultrafast Carrier Dynamics in VO$_2$ across the Pressure-Induced Insulator-to-Metal Transition
Ultrafast Carrier Dynamics in VO$_2$ across the Pressure-Induced Insulator-to-Metal Transition Open
We utilize near-infrared pump and mid-infrared probe spectroscopy to investigate the ultrafast electronic response of pressurized VO$_2$. Distinct pump-probe signals and a pumping threshold behavior are observed even in the pressure-induce…
View article: Doubly Dressed Bosons: Exciton Polaritons in a Strong Terahertz Field
Doubly Dressed Bosons: Exciton Polaritons in a Strong Terahertz Field Open
We demonstrate the existence of a novel quasiparticle, an exciton in a semiconductor doubly dressed with two photons of different wavelengths: a near infrared cavity photon and terahertz (THz) photon, with the THz coupling strength approac…
View article: 2s exciton-polariton revealed in an external magnetic field
2s exciton-polariton revealed in an external magnetic field Open
We demonstrate the existence of the excited state of an exciton-polariton in a semiconductor microcavity. The strong coupling of the quantum well heavy-hole exciton in an excited 2s state to the cavity photon is observed in non-zero magnet…
View article: Angular dependence of giant Zeeman effect for semimagnetic cavity polaritons
Angular dependence of giant Zeeman effect for semimagnetic cavity polaritons Open
The observation of spin-related phenomena of microcavity polaritons has been\nlimited due to weak Zeeman effect of non-magnetic semiconductors. We\ndemonstrate that the incorporation of magnetic ions into quantum wells placed\nin a non-mag…