Far-field optical imaging of surface plasmons with a subdiffraction limited separation
PublisherDe Gruyter Open Ltd
MetadataShow full item record
AbstractWhen an ultrathin silver nanowire with a diameter less than 100 nm is placed on a photonic band gap structure, surface plasmons can be excited and propagate along two side-walls of the silver nanowire. Although the diameter of the silver nanowire is far below the diffraction limit, two bright lines can be clearly observed at the image plane by a standard wide-field optical microscope. Simulations suggest that the two bright lines in the far-field are caused by the unique phase distribution of plasmons on the two side-walls of the silver nanowire. Combining with the sensing ability of surface plasmons to its environment, the configuration reported in this work is capable of functioning as a sensing platform to monitor environmental changes in the near-field region of this ultrathin nanowire.
SponsorsProgram for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
leakage radiation microscopy
photonic band gap
Identifier to cite or link to this itemhttp://hdl.handle.net/10713/14357