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Light-Matter Interactions at the Nanoscale

From molecular assemblies to hybrid nanostructures

About Us

Research activities of KGT Group at IISER Thiruvananthapuram (IISER TVM) focus on understanding the photochemistry and photophysics of molecular assemblies, plasmonic systems and semiconductor quantum dots, and chiral nanostructures.

The group was initially at CSIR-NIIST, Thiruvananthapuram, and moved to IISER TVM in  2010. The group is actively involved in both fundamental and translational research, undertaken by doctoral and BS-MS students. Alumni from the KGT group are occupying important positions as faculty members/research scientists in prestigious academic institutes and R & D laboratories.

Jointly with other colleagues, we have developed a surface-enhanced spectroscopy based device for the rapid detection of pesticide/insecticide residues.



Selected perspectives

Emergent chiroptical properties in supramolecular and plasmonic assemblies

Parallels between excitons and plasmons

Teaching Materials

Our research activities:


Plasmonically-powered chemical systems

  • Plasmon-exciton coupling using ensemble  and single-particle studies


  • Design of SERS platforms - enhancing the Raman signal  intensity through the generation of hot-spots


  • Plasmon driven chemical reactions

Photochemistry and photophysics of Semiconductor quantum dots


  • Light-induced energy and electron transfer processes (using various  steady-state and time-resolved techniques)


  • Single-molecule/particle spectroscopy to understand trap states in quantum dots and energy transfer hybrid systems

Chiroptical properties of nanostructures

  • Understanding the emergence of chiral plasmons/excitons in supramolecular assemblies  and nanostructures

  • Design of chiral nanostructures

Organization of molecules and nanomaterials on 2D surfaces

Latest from KGT group

Our selected research articles (recent)

Sieving and sensing using plasmonic nanoparticles

Handedness of chiral aggregates from CD signal

Surface ligand matters in Fermi level equilibration 

Growing chiral nanoparticles on organic template

ACS Nano (2019)

Depth of surface trap states dictates charge-transfer dynamics 

Emergence of chiroptical properties in supramolecular assemblies 

Factors determining the plexciton formation

ACS Nano (2018)

Rational design of 2D assemblies on surfaces

We sincerely thank the theoretical collaborations with:

Dr. R. S. Swathi, IISER Thiruvananthapuram (India), Dr. Stephen Gray, Argonne National Laboratory (USA), Dr. Cristina Sissa and Prof. Anna Painelli, University of Parma (Italy), Prof. Shobhana Narasimhan, JNCASR, Bangalore (India), Prof. S. Balasubramanian, JNCASR, Bangalore (India).


We thank DST and SERB for the generous funding through projects and IISER TVM for infrastructure facilities.