Phys.org October 31, 2023 An international team of researchers (Russia, UK, Germany) investigated active spatial control of polariton condensates independent of the polariton, gain-inducing excitation profile by introducing an extra intracavity semiconductor layer, nonresonant to the cavity mode. Partial saturation of the optical absorption in the uncoupled layer enabled the ultrafast modulation of the effective refractive index and, through excited-state absorption, the polariton dissipation. Utilizing an intricate interplay of these mechanisms, they demonstrated control over the spatial profile, density, and energy of a polariton condensate at room temperature… read more. TECHNICAL ARTICLE
Tag Archives: Light-matter coupling
Nanophotonics: Coupling light and matter
Science Daily June 23, 2023 Photonic bound states in the continuum (BICs) provide a platform for strong light-matter coupling with transition metal dichalcogenides (TMDCs) but have so far mostly been implemented as traditional all-dielectric metasurfaces with adjacent TMDC layers, incurring limitations related to strain, mode overlap and material integration. Researchers in Germany demonstrated intrinsic strong coupling in BIC-driven metasurfaces composed of nanostructured bulk tungsten disulfide (WS2) and exhibiting resonances with sharp, tailored linewidths and selective enhancement of light-matter interactions. Tuning of the BIC resonances across the exciton resonance in bulk WS2 was achieved by varying the metasurface unit cells, enabling […]
Scientists push the boundaries of manipulating light at the submicroscopic level
Phys.org March 2, 2023 How tightly the light is confined determines the limits for the observability of nanoparticles, as well as the intensity and the precision of light-based devices. An international team of researchers (UK, Germany) has developed a general theory describing multi-mode light–matter coupling in systems of reduced dimensionality. The researchers explored their phenomenology, validating their theory’s predictions against numerical electromagnetic simulations. They characterized the spectral features linked with the multi-mode nature of the polaritons and showed how the interference between different photonic resonances can modify the real-space shape of the electromagnetic field associated with each polariton mode. According […]
Physicists have developed a new photonic system with electrically tuned topological features
Phys.org October 14, 2022 In optoelectronics momentum and polarization degrees of freedom of light are interwoven and interfaced with electronics. However, manipulating photons through electrical means is a daunting task given their charge neutrality. An international team of researchers (Poland, Iceland, Italy) has developed electrically tunable microcavity exciton-polariton resonances in a Rashba-Dresselhaus spin-orbit coupling field. They showed that different spin-orbit coupling fields and the reduced cavity symmetry led to tunable formation of the Berry curvature, the hallmark of quantum geometrical effects. They implemented an architecture of a photonic structure with a two-dimensional perovskite layer incorporated into a microcavity filled with […]
Physicists develop efficient modem for a future quantum internet
Phys.org November 5, 2020 A central research object is the interface between local quantum devices and light quanta that enable the remote transmission of highly sensitive quantum information. Researchers in Germany integrated a thin crystal of erbium-doped yttrium orthosilicate a cryogenic Fabry-Perot resonator leading to 56-fold enhancement of the emission rate with an out-coupling efficiency of 46%. They demonstrated that the emitter properties are not degraded. They observed ensemble-averaged optical coherence up to 0.54 ms, which exceeds the 0.19 ms lifetime of dopants at the cavity field maximum. The approach is also applicable to other solid-state quantum emitters, such as […]
Controlling ultrastrong light-matter coupling at room temperature
EurekAlert September 23, 2020 Ultrastrong coupling is a distinct regime of electromagnetic interaction that enables a rich variety of intriguing physical phenomena. An international team of researchers (Sweden, Russia, Poland) used a plasmonic nanorod array positioned at the antinode of a resonant optical Fabry-Pérot microcavity to reach the ultrastrong coupling (USC) regime at ambient conditions and without the use of magnetic fields. From optical measurements they extracted the value of the interaction strength over the transition energy as high as g/ω ~ 0.55, deep in the USC regime, while the nanorod array occupies only ∼4% of the cavity volume. They indirectly observed […]