I obtained my first degree in Materials Science from Indian Institute of Technology, Kharagpur (India) and PhD on Raman Spectroscopy of Carbon Nanostructures from University of Cambridge (UK).

 In 2003 I joined Prof. Sir Mark Welland’s Group in Nanoscience Centre, Cambridge (UK) and developed a prototype super-resolution Raman spectroscopy and imaging system in reflection mode.

 In 2005, I joined the National Physical Laboratory to establish a technical area on Analytical and Optical Nanoprobes to develop measurement science to position the UK for emerging bio nanotechnologies. During this period, I received several awards for best papers, initiated the international standardization for Raman spectroscopy and started the international conference on tip-enhanced Raman spectroscopy. I have regularly given invited talks in international scientific conferences as well as industrial meetings.

 In 2017 I joined Swansea University to build research activities on laser analytics and nanoscience. Areas of interest includes nanobiotechnology, advanced materials and sensors. 

Areas of Expertise

  • Raman Spectroscopy
  • Tip-enhanced Raman Spectroscopy
  • Graphene and 2D Materials
  • Coherent Raman Imaging of Biological Systems
  • Sensors and Digital Molecular Diagnostics


  1. & Intervalley scattering by acoustic phonons in two-dimensional MoS2 revealed by double-resonance Raman spectroscopy. Nature Communications 8, 14670
  2. & Simultaneous topographical, electrical and optical microscopy of optoelectronic devices at the nanoscale. Nanoscale 9(8), 2723-2731.
  3. & Extending the plasmonic lifetime of tip-enhanced Raman spectroscopy probes. Physical Chemistry Chemical Physics 18(19), 13710-13716.
  4. & Nanoscale mapping of excitonic processes in single-layer MoS2 using tip-enhanced photoluminescence microscopy. Nanoscale 8(20), 10564-10569.
  5. & Nanoscale mapping of intrinsic defects in single-layer graphene using tip-enhanced Raman spectroscopy. Chemical Communications 52(53), 8227-8230.

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