Laser Induced Breakdown Spectroscopy

Laser Raman Spectroscopy

Surface Enhanced Raman Spectroscopy

Laser based Fabrication of Nanomaterials and their Characterizations

The focus of the research is, by exploiting the high purity of laser beam and ultra-high pulse power, to study the molecular interactions, chemical composition, elemental concentration, phase and polymorphy of elements presents in different specimen (be it biological, chemical or polymorph), to fabricate nano-clusters from different noble materials (gold, silver, and aluminum and their alloys), and investigate their morphology and dynamics. Two custom-built state-of-art experimental techniques- Laser Induced Breakdown Spectroscopy (LIBS) and Laser Raman Spectroscopy-are being used. The LIBS experimental set-up has a gated and intensified CCD (ICCD) camera as the optical detector, which renders the instrument to detect trace element down to ppm level and thus making it a good choice for pollution monitoring and geological exploration in Bangladesh. Recently, we could construct an optimized Laser Raman system using the same ICCD optical detector and develop a reliable Surface Enhanced Raman Spectroscopy (SERS) protocols. The newly constructed SERS system would mark as a new dimension in the experimental research in Bangladesh, which would open up multitude of possibilities to carry state-of-art research in the days to come.

Stark Spectroscopy and Advanced Laser Spectroscopy (Single Molecule Spectroscopy and Transient Absorption Spectroscopy and Time-Resolved Fluorescence Spectroscopy) on natural, engineered photosynthetic pigment-protein complexes and their artificial analogs for precisely uncovering their biophysical molecular mechanisms and electronic structures associated with their Light-Harvesting and Regulative Energy Dissipation functions.

Natural photosynthesis has been a huge source of inspiration over the years for designing bio-inspired artificial devices for solar energy conversion and storage. To this end, achieving precise control on pigment organization and pigment-pigment/pigment-protein interactions is of the primary challenge in the design of artificial analogs of light-harvesting pigment-protein complexes. In such contex, precise mapping of the electronic structures and understanding of the strength and nature of Charge Transfer (CT) states of the mentioned natural, engineered photosynthetic antennas and their artificial analogs may be a good source of inspiration for designing and developing more versatile and efficient next generation natural /artificial solar energy conversion systems. Creation of artificial photosynthetic systems could meet the ever-increasing demand for cheap, environmentally clean energy for the generation to come.

The mentioned research are being performed in collaboration with different renowned and leading research groups around the globe (the Netherlands, Germany, England, Czech Republic, USA, Israel and Japan).

Stark Spectroscopy and other spectroscopic techniques to investigate the properties of some Organic Conjugated Polymers important for making light emitting diodes.

Collaborator: Dr. Linda A Peteanu, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA.

Stark Spectroscopy and other spectroscopic techniques to investigate the electronic structures and excite stated dynamics of a variety of Natural Carotenoids and their different Isomers to be used in Engineered and Artificial Photosynthetic pigment-protein analogs for harnessing better conversion efficiency.

Collaborator: Dr. Hideki Hashimoto, Kwansei Gakuin University, Sanda, Kobe, Japan.