•   News &Updates
    1. One Phd Position Open; Interested students may contact Prof. Arindam Chowdhury directly
    2. Congratulation to Jaladhar for successfully defending his Ph.D. thesis "Probing Molecular Interactions and Orientations using Spectrally and Polarization Resolved Fluorescence Microscopy"
    3. Congratulation to Amitrajit for "Influence of Atmospheric Constituents on Spectral Instability and Defect-Mediated Carrier Recombination in Hybrid Perovskite Nanoplatelets", The Journal of Physical Chemistry C, 2021 [PDF]
    4. Congratulation to Rohita for "Tunable Multiplexed Whole-Cell Biosensors as Environmental Diagnostics for ppb-Level Detection of Aromatic Pollutants" ACS Sensors, 2021 [PDF]
    5. Congratulation to Jaladhar for "Polarization-resolved single-molecule tracking reveals strange dynamics of individual fluorescent tracers through a plasticized (rubbery) polymer network", Physical Chemistry Chemical Physics, 2021[PDF]

Focus: Understand spatiotemporal heterogeneity in semiconductor nanocrystals/heterostructures, soft-materials and biological systems using sub-ensemble and single-molecule fluorescence spectroscopy and diffusion dynamics

Systems of current interest to probe extent of heterogeneity:

  • Carrier localization in (In,Ga)N quantum-wells (QWs) used for solid-state LEDs
  • Luminescent quantum-dots (QDs), doped/alloyed nanocrystals and nanoaggregates
  • Hybrid/doped perovskite micro-/nano-crystals for solar photovoltaics (PVs) and LEDs
  • Soft matter hydrated networks/gels such as polymers/ionomers and polymersomes
  • Spatial distribution of analytes (ions/molecules) in intracellular media (single-cells)
  • Structural heterogeneity of amyloid fibrils relevant for neurodegenerative diseases
  • Liquid liquid phase separation of proteins and peptides
  • Biosensors

Techniques and methodologies used:

  • Laser epifluorescence and total internal reflection fluorescence (TIRF) microscopy
  • Single-emitter (molecule/nanocrystal/defect) spectroscopy and blinking (emission intermittency)
  • Super-resolution single-molecule/particle tracking (translational and reorientational dynamics)
  • Spectrally resolved fluorescence microscopy (spatially-resolved luminescence spectroscopy)
  • Spectrally resolved sensitization imaging
  • Polarization-resolved fluorescence anisotropy imaging
  • Polarization-resolved single-molecule tracking (PR-SMT)
  • Fluorescence correlation spectroscopy (FCS)
  • Fluorescence lifetime imaging microscopy (FLIM)