Our analysis presents an explanation of the Sun–Earth coupling mechanism during declining phase of a solar cycle,and how the dominant 13.5 and 27 day periods play roles in the coupling mechanism which led to intense ...Our analysis presents an explanation of the Sun–Earth coupling mechanism during declining phase of a solar cycle,and how the dominant 13.5 and 27 day periods play roles in the coupling mechanism which led to intense terrestrial magnetic storms during this declining phase compared to the rising phase of a solar cycle.Moreover,it is observed that while the 27 day period gets strongly modulated in the rising phase,the 13.5 day period modulation is more prominent during the declining phase.It is suggested that out of the 27 and 13.5 day periods of Sun–Earth interaction,the preferred period of modulation happens to be the one which is more dominant for the less random or quieter system participating in the coupling.It is reported for the first time that the 13.5 day period is more prominent in the Sun–Earth interaction during the declining phase of a solar cycle,as it is the most dominant period of Earth's magnetic system,which happens to be more persistent as a dynamical system and hence quieter or more receptive than the Sun.展开更多
We review recent studies of cavity switching induced by the optical injection of free carriers in micropillar cavities containing quantum dots.Using the quantum dots as a broadband internal light source and a streak c...We review recent studies of cavity switching induced by the optical injection of free carriers in micropillar cavities containing quantum dots.Using the quantum dots as a broadband internal light source and a streak camera as detector,we track the resonance frequencies for a large set of modes with picosecond time resolution.We report a record-fast switch-on time constant(1.5 ps)and observe major transient modifications of the modal structure of the micropillar on the 10 ps time scale:mode crossings are induced by a focused symmetric injection of free carriers,while a lifting of several mode degeneracies is observed when off-axis injection breaks the rotational symmetry of the micropillar.We show theoretically and experimentally that cavity switching can be used to tailor the dynamic properties of the coupled QD-cavity system.We report the generation of ultrashort spontaneous emission pulses(as short as 6 ps duration)by a collection of frequency-selected QDs in a switched pillar microcavity.These pulses display a very small coherence length,attractive for ultrafast speckle-free imaging.Moreover,the control of QD-mode coupling on the 10 ps time scale establishes cavity switching as an appealing resource for quantum photonics.展开更多
基金MOTA for providing a fellowship under the NFST projectIISER,Kolkata for providing all necessary support。
文摘Our analysis presents an explanation of the Sun–Earth coupling mechanism during declining phase of a solar cycle,and how the dominant 13.5 and 27 day periods play roles in the coupling mechanism which led to intense terrestrial magnetic storms during this declining phase compared to the rising phase of a solar cycle.Moreover,it is observed that while the 27 day period gets strongly modulated in the rising phase,the 13.5 day period modulation is more prominent during the declining phase.It is suggested that out of the 27 and 13.5 day periods of Sun–Earth interaction,the preferred period of modulation happens to be the one which is more dominant for the less random or quieter system participating in the coupling.It is reported for the first time that the 13.5 day period is more prominent in the Sun–Earth interaction during the declining phase of a solar cycle,as it is the most dominant period of Earth's magnetic system,which happens to be more persistent as a dynamical system and hence quieter or more receptive than the Sun.
基金the Laboratoire d’Excellence LANEF in Grenoble(ANR-10-LABX-51-01)for a PhD grant.G.M.T.and P.L.S.acknowledge funding from CAPES(PDSE 88881.187056/2018.1)CNPq.This work was also partly funded by the FOM“Zap!”projectwhich is financially supported by NWO,NWO-Nano,and STW,as well as by NOMOS project,which is financed by ANR(ANR-18CE24-0026).
文摘We review recent studies of cavity switching induced by the optical injection of free carriers in micropillar cavities containing quantum dots.Using the quantum dots as a broadband internal light source and a streak camera as detector,we track the resonance frequencies for a large set of modes with picosecond time resolution.We report a record-fast switch-on time constant(1.5 ps)and observe major transient modifications of the modal structure of the micropillar on the 10 ps time scale:mode crossings are induced by a focused symmetric injection of free carriers,while a lifting of several mode degeneracies is observed when off-axis injection breaks the rotational symmetry of the micropillar.We show theoretically and experimentally that cavity switching can be used to tailor the dynamic properties of the coupled QD-cavity system.We report the generation of ultrashort spontaneous emission pulses(as short as 6 ps duration)by a collection of frequency-selected QDs in a switched pillar microcavity.These pulses display a very small coherence length,attractive for ultrafast speckle-free imaging.Moreover,the control of QD-mode coupling on the 10 ps time scale establishes cavity switching as an appealing resource for quantum photonics.
