Low Temperature Scanning tunnelling microscopy (STM) and Spectroscopy (STS): Instrumentation and Applications.
STM tunnelling induced light emission from metal/semiconductor surfaces: Spatial resolution and spectroscopy.
Investigating the effect of junction geometry in tuning emission wavelengths, especially extension to the infrared.
Effect of change in dielectric environment on emission spectra. Application to detection of such change in the nanoscale.
Application of the technique to enhance chemical identification capabilities of the STM.
Optical switching in azobenzene molecules probed by STM spectroscopy.
Finite difference time domain simulations of surface plasmon resonances of plasmonic nanostructures (e.g. STM tip sample junctions, tip enhanced Raman spectroscopy and nanostructured surfaces). Phenomenological modelling of STM light emission.
Metal – Semiconductor Schottky Junctions (micro to nanoscale)
Nanoscale Schottky Junctions: fabrication and characterization of Pt nanowires on Si using focused ion beam technique.
Design and characterization of Pt/Pd–Si/InP Schottky Junction devices for high sensitivity (1 ppm) H2 sensing applications.
Simulation of electrical transport and temperature dependence in Schottky junction devices.
Study of ZnO thin films and nanostructures via optical spectroscopy, scanning tunnelling spectroscopy and STMLE.
Fabrication and characterization of n-type ZnO and p-type polymer based devices for photovoltaic applications.