Miniaturized light sources at telecommunication wavelengths are essential components for on-chip optical communication systems.Here,we report the growth and fabrication of highly uniform p-i-n core-shell InGaAs/InP si...Miniaturized light sources at telecommunication wavelengths are essential components for on-chip optical communication systems.Here,we report the growth and fabrication of highly uniform p-i-n core-shell InGaAs/InP single quantum well(QW)nanowire array light emitting diodes(LEDs)with multi-wavelength and high-speed operations.Two-dimensional cathodoluminescence mapping reveals that axial and radial QWs in the nanowire structure contribute to strong emission at the wavelength of~1.35 and~1.55μm,respectively,ideal for low-loss optical communications.As a result of simultaneous contributions from both axial and radial QWs,broadband electroluminescence emission with a linewidth of 286 nm is achieved with a peak power of~17μW.A large spectral blueshift is observed with the increase of applied bias,which is ascribed to the band-filling effect based on device simulation,and enables voltage tunable multi-wavelength operation at the telecommunication wavelength range.Multi-wavelength operation is also achieved by fabricating nanowire array LEDs with different pitch sizes on the same substrate,leading to QW formation with different emission wavelengths.Furthermore,high-speed GHz-level modulation and small pixel size LED are demonstrated,showing the promise for ultrafast operation and ultracompact integration.The voltage and pitch size controlled multi-wavelength highspeed nanowire array LED presents a compact and efficient scheme for developing high-performance nanoscale light sources for future optical communication applications.展开更多
The living body is composed of innumerable fine and complex structures.Although these structures have been studied in the past,a vast amount of information pertaining to them still remains unknown.When attempting to o...The living body is composed of innumerable fine and complex structures.Although these structures have been studied in the past,a vast amount of information pertaining to them still remains unknown.When attempting to observe these ultra-structures,the use of electron microscopy(EM)has become indispensable.However,conventional EM settings are limited to a narrow tissue area,which can bias observations.Recently,new trends in EM research have emerged,enabling coverage of far broader,nano-scale fields of view for two-dimensional wide areas and three-dimensional large volumes.Moreover,cutting-edge bioimage informatics conducted via deep learning has accelerated the quantification of complex morphological bioimages.Taken together,these technological and analytical advances have led to the comprehensive acquisition and quantification of cellular morphology,which now arises as a new omics science termed‘morphomics’.展开更多
文摘Miniaturized light sources at telecommunication wavelengths are essential components for on-chip optical communication systems.Here,we report the growth and fabrication of highly uniform p-i-n core-shell InGaAs/InP single quantum well(QW)nanowire array light emitting diodes(LEDs)with multi-wavelength and high-speed operations.Two-dimensional cathodoluminescence mapping reveals that axial and radial QWs in the nanowire structure contribute to strong emission at the wavelength of~1.35 and~1.55μm,respectively,ideal for low-loss optical communications.As a result of simultaneous contributions from both axial and radial QWs,broadband electroluminescence emission with a linewidth of 286 nm is achieved with a peak power of~17μW.A large spectral blueshift is observed with the increase of applied bias,which is ascribed to the band-filling effect based on device simulation,and enables voltage tunable multi-wavelength operation at the telecommunication wavelength range.Multi-wavelength operation is also achieved by fabricating nanowire array LEDs with different pitch sizes on the same substrate,leading to QW formation with different emission wavelengths.Furthermore,high-speed GHz-level modulation and small pixel size LED are demonstrated,showing the promise for ultrafast operation and ultracompact integration.The voltage and pitch size controlled multi-wavelength highspeed nanowire array LED presents a compact and efficient scheme for developing high-performance nanoscale light sources for future optical communication applications.
基金supported by RIKEN Engineering Network Project,RIKEN Aging Project,the Japan Society for the Promotion of Science(JSPS KAKENHI,18K19766 and 15K16536)Prof.Osafune Memorial Scholarship from the Japanese Society of Microscopythe Strategic Core Technology Advancement Program(Supporting Industry Program,SAPOIN)funded by the Ministry of Economy,Trade and Industry in Japan.
文摘The living body is composed of innumerable fine and complex structures.Although these structures have been studied in the past,a vast amount of information pertaining to them still remains unknown.When attempting to observe these ultra-structures,the use of electron microscopy(EM)has become indispensable.However,conventional EM settings are limited to a narrow tissue area,which can bias observations.Recently,new trends in EM research have emerged,enabling coverage of far broader,nano-scale fields of view for two-dimensional wide areas and three-dimensional large volumes.Moreover,cutting-edge bioimage informatics conducted via deep learning has accelerated the quantification of complex morphological bioimages.Taken together,these technological and analytical advances have led to the comprehensive acquisition and quantification of cellular morphology,which now arises as a new omics science termed‘morphomics’.
