Electromagnetically induced transparency has the unique ability to optically control transparency windows with low light in atomic systems.However,its practical applications in quantum physics and information science ...Electromagnetically induced transparency has the unique ability to optically control transparency windows with low light in atomic systems.However,its practical applications in quantum physics and information science are limited due to rigid experimental requirements.Here we demonstrate a new mechanism of optically induced transparency in a micro-cavity by introducing a four-wave mixing gain to nonlinearly couple two separated resonances of the micro-cavity in an ambient environment.A signature Fano-like resonance was observed owing to the nonlinear interference of the two coupled resonances.Moreover,we show that the unidirectional gain of the four-wave mixing can lead to the remarkable effect of non-reciprocal transmission at the transparency windows.Optically induced transparency may offer a unique platform for a compact,integrated solution to all-optical and quantum information.展开更多
Top-down lithography techniques are needed for manufacturing uniform device structures based on emerging 2D-layered materials.Mechanical exfoliation approaches based on nanoimprint and nanoprint principles are capable...Top-down lithography techniques are needed for manufacturing uniform device structures based on emerging 2D-layered materials.Mechanical exfoliation approaches based on nanoimprint and nanoprint principles are capable of producing ordered arrays of multilayer transition metal dichalcogenide microstructures with a high uniformity of feature dimensions.In this study,we present a study on the applicability of nanoimprint-assisted shear exfoliation for generating ultrathin monolayer and few-layer MoS_(2) structures as well as the critical limits of feature dimensions produced via such nanoimprint and nanoprint-based processes.In particular,this work shows that give a lateral feature size of MoS_(2) structures that are pre-patterned on a bulk stamp,there exists a critical thickness or aspect ratio value,below which the exfoliated layered structures exhibit major defects.To exfoliate a highquality,uniform monolayer or few-layer structures,the characteristic lateral feature sizes of such structures need to be in the sub-100 nm regimes.In addition,the exfoliated MoS_(2) flakes of critical thicknesses exhibit prominent interlayer twisting features on their cleaved surfaces.Field-effect transistors made from these MoS_(2) flakes exhibit multiple(or quasi-analog-tunable)charge memory states.This work advances the knowledge regarding the limitations and application scope of nanoimprint and nanoprint processes in manufacturing nano/microstructures based on layered materials and provides a method for producing multi-bit charge memory devices.展开更多
基金supported by the National Natural Science Foundation of China(grant nos 11304201 and 61475100)the National 1000-plan Program(Youth),the Shanghai Pujiang Talent Program(grant no.12PJ1404700)the Shanghai Scientific Innovation Program(grant no.14JC1402900).
文摘Electromagnetically induced transparency has the unique ability to optically control transparency windows with low light in atomic systems.However,its practical applications in quantum physics and information science are limited due to rigid experimental requirements.Here we demonstrate a new mechanism of optically induced transparency in a micro-cavity by introducing a four-wave mixing gain to nonlinearly couple two separated resonances of the micro-cavity in an ambient environment.A signature Fano-like resonance was observed owing to the nonlinear interference of the two coupled resonances.Moreover,we show that the unidirectional gain of the four-wave mixing can lead to the remarkable effect of non-reciprocal transmission at the transparency windows.Optically induced transparency may offer a unique platform for a compact,integrated solution to all-optical and quantum information.
基金This work was supported by NSF grant#CMMI-1636132.
文摘Top-down lithography techniques are needed for manufacturing uniform device structures based on emerging 2D-layered materials.Mechanical exfoliation approaches based on nanoimprint and nanoprint principles are capable of producing ordered arrays of multilayer transition metal dichalcogenide microstructures with a high uniformity of feature dimensions.In this study,we present a study on the applicability of nanoimprint-assisted shear exfoliation for generating ultrathin monolayer and few-layer MoS_(2) structures as well as the critical limits of feature dimensions produced via such nanoimprint and nanoprint-based processes.In particular,this work shows that give a lateral feature size of MoS_(2) structures that are pre-patterned on a bulk stamp,there exists a critical thickness or aspect ratio value,below which the exfoliated layered structures exhibit major defects.To exfoliate a highquality,uniform monolayer or few-layer structures,the characteristic lateral feature sizes of such structures need to be in the sub-100 nm regimes.In addition,the exfoliated MoS_(2) flakes of critical thicknesses exhibit prominent interlayer twisting features on their cleaved surfaces.Field-effect transistors made from these MoS_(2) flakes exhibit multiple(or quasi-analog-tunable)charge memory states.This work advances the knowledge regarding the limitations and application scope of nanoimprint and nanoprint processes in manufacturing nano/microstructures based on layered materials and provides a method for producing multi-bit charge memory devices.
