Scanning tunneling luminescence

Role of Surface Plasmons in Scanning Tunneling Luminescence... 

Dunn, R.C. 1999. Luminescence in scanning tunneling microscopy on III-V nanostructures. Chem. Rev. 99 2891-2927. 

Laiho, R., et al. (1997), Spin-polarized scanning tunnelling microscopy with detection of polarized luminescence emerging from a semiconductor tip,/. Phys. Condens. Matter, 9, 5697-5707. 

Distribution of bonded molecules may be examined by means of any physico- chemical method sensitive to intermolecular interactions, e.g. luminescence or ESR. Here we are not going to discuss the use of electronic microscopy and scanning tunnelling microscopy for the investigation of the spatial organization of bonded layers. The first method needs heavy atoms in the bonded layer, the second - electroconductive and, where possible, smooth or monocrystalline supports. 

Spin-polarized scanning tunneling spectroscopy (SPSTS) Phonon spectroscopy by inelastic electron tunneling (lET) Photoassisted tunneling spectroscopy (SFES) Tunneling-induced luminescence spectroscopy (TILS)... 

Measurements. Absorption spectra measurements on the film and solutions of the metal complexes were measured on a modified Cary 14 spectrometer. Luminescence spectra were recorded with a custom photon counting spectrometer or a PTI (Deer Park Drive, South Brunswick, NJ 08852) luminescence spectrometer system. The FT-IR spectra were recorded with a PE-1600 spectrometer or a Bio-Rad FTS-40 spectrometer (Professor R. Crooks, Chemistry Department, University of New Mexico). RA spectra for LB films were measured on the FTS-40 with a Hanick gra2dng angle attachment and MCT detection system. Typically 256 scans were requir to obtain adequate intensity for the monolayer films. The scanning tunneling microscopy measurements employed a Nanoscope II system (Digital Instruments, Inc.). Etched Pt-Ir tips were used with the standard, 0.6 micron head. The system can be operated in either the constant current or constant height mode but the film contours were similar for either. 

Image of the energy of the plasmon resonance for a multidot sub monolayer consisting of three different types of CdSe/ZnS core/shell quantum dots with emission (in solution) at 536 (blue), 557 (green) and 614 (red) nm. (b) Tunneling luminescence spectra showing the resonances in the extinction of the free plasmon for the three different types of dot. (c) A line scan over the image (a) demonstrates a resolution better than 10 nm. 

---