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The field of quantum technology has been rapidly expanding in the past decades, yielding numerous applications, such as quantum information, quantum communication, and quantum cybersecurity. At the core of these applications lies the quantum emitter (QE), a precisely controllable generator of either single photons or photon pairs. Semiconductor QEs, such as perovskite nanocrystals and semiconductor quantum dots, have shown much promise as emitters of pure single photons, with the potential for generating photon pairs when hybridized with plasmonic nanocavities. In this study, we have developed a system in which individual quantum emitters and their ensembles can be traced before, during, and after the interaction with an external plasmonic metasurface in a controllable way. Upon coupling the external plasmonic metasurface to the QE array, the individual QEs switch from the single-photon emission mode to the multiphoton emission mode. Remarkably, this method preserves the chemical structure and composition of the QEs, allowing them to revert to their initial state after decoupling from the plasmonic metasurface. This significantly expands the potential applications of semiconductor QEs in quantum technologies.

This work addresses the issue of laser-induced white light generation by nano- and micro-diamond powder and the accompanying redox processes occurring at the surface of the particles. The broadband white light is generated by near infra-red continuous wave laser (975 nm) on micro and nano-diamond powders sealed in lightbulb-like devices. It is shown that the emission from diamond samples is a highly nonlinear process with apparent saturation close to 1 W of the optical excitation power. Multiband mechanism and mixed hybridization at particle surface are further discussed as a possible origin of the white light emission. Changes in the sp2/sp3 ratio upon the laser excitation are here discussed in terms of molecular dynamics simulations. Observed surface changes related to diamond graphitization are considered further as possible pathways for chemical reactions at the interface of the glass and diamond samples. Obtained results bring relevant physical premises according to the possible mechanism responsible for the white emission from diamond-like carbon materials, its mechanisms, and an essential figure of merit considering the diverse applicability of this phenomenon in various electronic devices.

Plexcitonic systems based on metal nanostructures and molecular J-aggregates offer an excellent opportunity to explore the intriguing interplay between plasmonic excitations and excitons, offering unique insights into light–matter interactions at the nanoscale. Their potential applications in photocatalysis have prompted a growing interest in both their synthesis and the analysis of their properties. However, in order to construct a high-performing system, it is essential to ensure chemical and spectral compatibility between both components. We present the results of a study into a hybrid system, achieved through the coupling of gold nanobipyramids with organic molecules, and demonstrate the strengthened photochemical properties of such a system in comparison with purely J-aggregates. Our analysis includes the absorbance and photoluminescence characterization of the system, revealing the remarkable plexcitonic interaction and pronounced coupling effect. The absorbance spectroscopy of the hybrid systems enabled the investigation of the coupling strength (g). Additionally, the photoluminescence response of the J-aggregates and coupled systems reveals the impact of the coupling regime. Utilizing fluorescence lifetime imaging microscopy, we established how the photoluminescence lifetime components of the J-aggregates are affected within the plexcitonic system. Finally, to assess the photodegradation of J-aggregates and plexcitonic systems, we conducted a comparative analysis. Our findings reveal that plasmon-enhanced interactions lead to improved photostability in hybrid systems.

Plexcitonic systems based on metal nanostructures and molecular J-aggregates offer an excellent opportunity to explore the intriguing interplay between plasmonic excitations and excitons, offering unique insights into light–matter interactions at the nanoscale. Their potential applications in photocatalysis have prompted a growing interest in both their synthesis and the analysis of their properties. However, in order to construct a high-performing system, it is essential to ensure chemical and spectral compatibility between both components. We present the results of a study into a hybrid system, achieved through the coupling of gold nanobipyramids with organic molecules, and demonstrate the strengthened photochemical properties of such a system in comparison with purely J-aggregates. Our analysis includes the absorbance and photoluminescence characterization of the system, revealing the remarkable plexcitonic interaction and pronounced coupling effect. The absorbance spectroscopy of the hybrid systems enabled the investigation of the coupling strength (g). Additionally, the photoluminescence response of the J-aggregates and coupled systems reveals the impact of the coupling regime. Utilizing fluorescence lifetime imaging microscopy, we established how the photoluminescence lifetime components of the J-aggregates are affected within the plexcitonic system. Finally, to assess the photodegradation of J-aggregates and plexcitonic systems, we conducted a comparative analysis. Our findings reveal that plasmon-enhanced interactions lead to improved photostability in hybrid systems.

The right of first refusal within the meaning of article 596 of the Civil Code creates an obligation on the part of the obligor to sell a thing to a third party on condition that the party entitled to the right of first refusal has not exercised the said right. The party entitled to the right may confirm the intention to exercise the right by making a declaration of will. Once such a declaration has been made, a contract between the obligor and the entitled party is deemed concluded on the same terms and conditions as provided for in the contract entered into by the obligor and a third party. Both the obligor and a third party may seek to deprive the entitled party of the right, or the possibility of exercising it. They may, for instance, enter into an apparent contract between themselves. The aim of this paper is to establish the legal remedies that are available to the entitled party to protect against such apparent contracts. The specific measures provided in the Civil Code for the protection of the party entitled to a right of first refusal prove inadequate in the event when an apparent contract between the obligor and a third party. A successful claim for compensation under article 599 § 1 of the Civil Code would require a very difficult test for the ‘evidence of apparency’ while the instrument referred to in article 600 § 1 clause 2 of the Civil Code does not apply at all. There are also limitations of the possibility of relying on the presumption of fact principle in establishing the ill-faith of the obligor and a third party, while an unusual conduct of parties (e.g. stipulation of a grossly inadequate consideration) may constitute a premise for the presumption of ill-faith of the parties only if they are unable to provide a reasonable rationale for such conduct., Prawo pierwokupu (art. 596 i n. k.c.) kreuje po stronie zobowiązanego obowiązek sprzedaży rzeczy osobie trzeciej pod warunkiem, że uprawniony ze swego prawa nie skorzysta. Uprawniony z prawa pierwokupu ma zaś możliwość złożenia oświadczenia, że ze swego prawa korzysta. W wyniku złożenia oświadczenia o skorzystaniu z prawa pierwokupu dochodzi do zawarcia umowy między zobowiązanym a uprawnionym na warunkach co do zasady takich, jak te określone w umowie między zobowiązanym a osobą trzecią. Zobowiązany i osoba trzecia mogą na różne sposoby próbować pozbawić uprawnionego jego prawa albo możliwości skorzystania z niego. Jednym z nich jest zawieranie umów pozornych przez zobowiązanego z osobą trzecią. Celem artykułu była próba ustalenia, jakie środki prawne do ochrony przed takimi umowami przysługują uprawnionemu. Szczególne środki przewidziane w Kodeksie cywilnym do ochrony uprawnionego z tytułu prawa pierwokupu okazują się zawodne w wypadku zawarcia pozornej umowy przez zobowiązanego z osobą trzecią. Uzyskanie odszkodowania na podstawie art. 599 § 1 k.c. wymagałoby przeprowadzenia niezwykle trudnego dowodu pozorności, a instrument określony w art. 600 § 1 zd. 2 k.c. w ogóle nie znajduje zastosowania. Bardzo ograniczone są też możliwości korzystania z domniemań faktycznych dla udowodnienia złej wiary zobowiązanego i osoby trzeciej. Nietypowe postępowanie stron (np. zastrzeżenie rażąco nieekwiwalentnej ceny) tylko wtedy może stanowić przesłankę takiego domniemania, gdy strony nie mogą podać żadnego racjonalnego powodu swego postępowania.