Search results for "light-matter interaction"
showing 4 items of 4 documents
Improving nanoscale terahertz field localization by means of sharply tapered resonant nanoantennas
2020
Abstract Terahertz resonant nanoantennas have recently become a key tool to investigate otherwise inaccessible interactions of such long-wavelength radiation with nano-matter. Because of their high-aspect-ratio rod-shaped geometry, resonant nanoantennas suffer from severe loss, which ultimately limits their field localization performance. Here we show, via a quasi-analytical model, numerical simulations, and experimental evidence, that a proper tapering of such nanostructures relaxes their overall loss, leading to an augmented local field enhancement and a significantly reduced resonator mode volume. Our findings, which can also be extended to more complex geometries and higher frequencies,…
TAPERING RESONANT NANOANTENNAS FOR ENHANCED THz LIGHT – NANOMATTER INTERACTIONS
2020
Nel corso degli ultimi decenni la tecnologia terahertz (THz) è diventata un fruttuoso campo di ricerca grazie alla spinta ricevuta dal desiderio di sfruttarne le promettenti applicazioni in questa porzione dello spettro elettromagnetico. La biologia, la medicina e l’ingegneria sono soltanto alcuni dei settori che guardano con interesse alle ultime scoperte nella ricerca sulle onde THz. Questo enorme interesse nasce dalle peculiari proprietà di tali onde, come ad esempio: il carattere non ionizzante, l’opacità di svariati materiali solitamente trasparenti in altri intervalli di frequenze e per le potenziali ricadute positive nel campo della tecnologia dell’informazione. Una fra le applicazio…
Purcell Enhancement and Wavelength Shift of Emitted Light by CsPbI3 Perovskite Nanocrystals Coupled to Hyperbolic Metamaterials
2020
Manipulation of the exciton emission rate in nanocrystals of lead halide perovskites (LHPs) was demonstrated by means of coupling of excitons with a hyperbolic metamaterial (HMM) consisting of alternating thin metal (Ag) and dielectric (LiF) layers. Such a coupling is found to induce an increase of the exciton radiative recombination rate by more than a factor of three due to the Purcell effect when the distance between the quantum emitter and HMM is nominally as small as 10 nm, which coincides well with the results of our theoretical analysis. Besides, an effect of the coupling-induced long wavelength shift of the exciton emission spectrum is detected and modeled. These results can be of i…
Controlling Atom-Photon Bound States in an Array of Josephson-Junction Resonators
2022
Engineering the electromagnetic environment of a quantum emitter gives rise to a plethora of exotic light -matter interactions. In particular, photonic lattices can seed long-lived atom-photon bound states inside photonic band gaps. Here, we report on the concept and implementation of a novel microwave architecture consisting of an array of compact superconducting resonators in which we have embedded two frequency -tunable artificial atoms. We study the atom-field interaction and access previously unexplored coupling regimes, in both the single-and double-excitation subspace. In addition, we demonstrate coherent interactions between two atom-photon bound states, in both resonant and dispers…