In this work,we achieve high count-rate single-photon output in single-mode(SM)optical fiber.Epitaxial and dilute InAs/GaAs quantum dots(QDs)are embedded in a GaAs/AlGaAs distributed Bragg reflector(DBR)with a micro-p...In this work,we achieve high count-rate single-photon output in single-mode(SM)optical fiber.Epitaxial and dilute InAs/GaAs quantum dots(QDs)are embedded in a GaAs/AlGaAs distributed Bragg reflector(DBR)with a micro-pillar cavity,so as to improve their light emission extraction in the vertical direction,thereby enhancing the optical SM fiber’s collection capabil-ity(numerical aperture:0.13).By tuning the temperature precisely to make the quantum dot exciton emission resonant to the micro-pillar cavity mode(Q~1800),we achieve a fiber-output single-photon count rate as high as 4.73×10^(6) counts per second,with the second-order auto-correlation g2(0)remaining at 0.08.展开更多
Topological lasers are immune to imperfections and disorder.They have been recently demonstrated based on many kinds of robust edge states,which are mostly at the microscale.The realization of 2D on-chip topological n...Topological lasers are immune to imperfections and disorder.They have been recently demonstrated based on many kinds of robust edge states,which are mostly at the microscale.The realization of 2D on-chip topological nanolasers with a small footprint,a low threshold and high energy efficiency has yet to be explored.Here,we report the first experimental demonstration of a topological nanolaser with high performance in a 2D photonic crystal slab.A topological nanocavity is formed utilizing the Wannier-type 0D corner state.Lasing behaviour with a low threshold of approximately 1μW and a high spontaneous emission coupling factor of 0.25 is observed with quantum dots as the active material.Such performance is much better than that of topological edge lasers and comparable to that of conventional photonic crystal nanolasers.Our experimental demonstration of a low-threshold topological nanolaser will be of great significance to the development of topological nanophotonic circuitry for the manipulation of photons in classical and quantum regimes.展开更多
基金supported by the Key-Area Research and Development Program of Guangdong Province(Grant No.2018B030329001)the National Key Technologies R&D Program of China(2018YFA0306101)+2 种基金The Scientific Instrument Developing Project of the Chinese Academy of Science(YJKYYQ20170032)the National Natural Science Foundation of China(61505196)the Program of Beijing Academy of Quantum Information Sciences(Grant No.Y18G01).
文摘In this work,we achieve high count-rate single-photon output in single-mode(SM)optical fiber.Epitaxial and dilute InAs/GaAs quantum dots(QDs)are embedded in a GaAs/AlGaAs distributed Bragg reflector(DBR)with a micro-pillar cavity,so as to improve their light emission extraction in the vertical direction,thereby enhancing the optical SM fiber’s collection capabil-ity(numerical aperture:0.13).By tuning the temperature precisely to make the quantum dot exciton emission resonant to the micro-pillar cavity mode(Q~1800),we achieve a fiber-output single-photon count rate as high as 4.73×10^(6) counts per second,with the second-order auto-correlation g2(0)remaining at 0.08.
基金supported by the National Natural Science Foundation of China(Grants nos.11934019,11721404,51761145104,61675228,and 11874419)the National Key R&D Program of China(Grant nos.2017YFA0303800 and 2018YFA0306101)+3 种基金the Key R&D Program of Guangdong Province(Grant no.2018B030329001)the Strategic Priority Research Program(Grant no.XDB28000000)the Instrument Developing Project(Grant no.YJKYYQ20180036)the Interdisciplinary Innovation Team of the Chinese Academy of Sciences.
文摘Topological lasers are immune to imperfections and disorder.They have been recently demonstrated based on many kinds of robust edge states,which are mostly at the microscale.The realization of 2D on-chip topological nanolasers with a small footprint,a low threshold and high energy efficiency has yet to be explored.Here,we report the first experimental demonstration of a topological nanolaser with high performance in a 2D photonic crystal slab.A topological nanocavity is formed utilizing the Wannier-type 0D corner state.Lasing behaviour with a low threshold of approximately 1μW and a high spontaneous emission coupling factor of 0.25 is observed with quantum dots as the active material.Such performance is much better than that of topological edge lasers and comparable to that of conventional photonic crystal nanolasers.Our experimental demonstration of a low-threshold topological nanolaser will be of great significance to the development of topological nanophotonic circuitry for the manipulation of photons in classical and quantum regimes.
