The role of molecular junctions in nanoelectronics is most often associated with electronic transport;however,their precise characterisation hinders their widespread development.The interaction of light with molecular...The role of molecular junctions in nanoelectronics is most often associated with electronic transport;however,their precise characterisation hinders their widespread development.The interaction of light with molecular junctions is a supplementary factor for the development of molecular switches,but it has rarely been addressed.The influence of light interaction with molecular junctions on the response of molecules in the near field was demonstrated by properly characterising the optical angular momentum at the junctions.Consequently,the molecular switching dynamics were observed in the Raman signatures of the conducting molecules.The illumination geometry and voltage applied to the junction were changed to demonstrate numerically and experimentally how the Raman intensity can be turned ON and OFF with a difference of nearly five orders of magnitude.These molecular-scale operations result from the combined interaction of a current-induced electronic rearrangement in the molecular junction and a plasmonically enhanced electromagnetic field near the tip of the junction.This study of the effect of optical angular momentum on the near field of the molecular junction shows significant potential for the development of molecular electronics.展开更多
An LED-integrated excitation cube(LEC)was designed to address the limitations of conventional fluorescence lamps.The LEC has a decentralized structure,high optical power density,and efficient illumination.The optical ...An LED-integrated excitation cube(LEC)was designed to address the limitations of conventional fluorescence lamps.The LEC has a decentralized structure,high optical power density,and efficient illumination.The optical efficiency of LECs is 1–2 orders of magnitude higher than that of mercury lamps,enabling high-quality fluorescence imaging with spectral coverage from UV to red.LECs can be easily installed on commercial fluorescence microscopes by replacing conventional fluorescence filter cubes,and a built-in LEC driver can identify the types of LEDs in different spectral bands to adopt optimal operating conditions.展开更多
基金supported by the National Key Research and Development Program of China(No.2021YFE0115700)Guangdong Basic and Applied Basic Research Foundation(Nos.2020A1515110709,2020A1515110712,and 2020B1515120068)Jihua Youth Innovation Fund(No.X201021XF200).
文摘The role of molecular junctions in nanoelectronics is most often associated with electronic transport;however,their precise characterisation hinders their widespread development.The interaction of light with molecular junctions is a supplementary factor for the development of molecular switches,but it has rarely been addressed.The influence of light interaction with molecular junctions on the response of molecules in the near field was demonstrated by properly characterising the optical angular momentum at the junctions.Consequently,the molecular switching dynamics were observed in the Raman signatures of the conducting molecules.The illumination geometry and voltage applied to the junction were changed to demonstrate numerically and experimentally how the Raman intensity can be turned ON and OFF with a difference of nearly five orders of magnitude.These molecular-scale operations result from the combined interaction of a current-induced electronic rearrangement in the molecular junction and a plasmonically enhanced electromagnetic field near the tip of the junction.This study of the effect of optical angular momentum on the near field of the molecular junction shows significant potential for the development of molecular electronics.
文摘An LED-integrated excitation cube(LEC)was designed to address the limitations of conventional fluorescence lamps.The LEC has a decentralized structure,high optical power density,and efficient illumination.The optical efficiency of LECs is 1–2 orders of magnitude higher than that of mercury lamps,enabling high-quality fluorescence imaging with spectral coverage from UV to red.LECs can be easily installed on commercial fluorescence microscopes by replacing conventional fluorescence filter cubes,and a built-in LEC driver can identify the types of LEDs in different spectral bands to adopt optimal operating conditions.
