Research Areas

High Contrast Gratings and Photonics | Renewable Energy | Terahertz Imaging and Spectroscopy | UV – Fluorescence Reader | Portable Diagnostics – Non-Invasive BP Monitoring

High – Contrast Gratings and Photonics

Sub-wavelength high contrast gratings for Solar Applications :

High Contrast Gratings (HCG) are structures with high contrast in refractive index from the surrounding medium. These structures are shown to have extraordinary properties: broadband ultra-high reflectivity, broadband ultra-high transmission, high quality factor resonances, novel diffraction and phase properties. At our lab, we are exploring several interesting properties of these gratings ranging from solar concentrators, fluorescence enhancing structures to color-shifting structures. For solar concentrators, our goal is to fabricate Smart Power windows which can pass visible light but harness the unused infrared spectrum and convert it to electricity. This structure consists of glass coated with TiO2 gratings. These gratings are designed in such a way that visible radiation will be passed through glass and the IR radiation will be guided through the glass and concentrated on to the edges where the photovoltaic cells convert the IR radiation to electricity.

                                         Lyolds             High-contrast-gratings-and-Photonics.                DSC_0097.

Equipments and Facilities:
Laser 405nm  | Optical Spectrum Analysers (Visible and Near infrared) | Spin Coater |  Grating Fabrication and Characterization Set-up

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Renewable Energy

Renewable energy field is undergoing dramatic growth as governments and energy companies around the world look to renewable energy sources to solve the energy problem in power and transportation sectors. However, progress in this direction has been largely hampered due to the high cost of renewable energy. In this scenario, an “energy revolution” is needed to harness various renewable energy sources cost effectively. Realization of such a dream requires motivated and trained young generation with a solid understanding of science, technology, business aspects and more importantly “India specific needs”. Current research in renewable energy at CSIR Chennai, focuses on the development of systems for solar thermal, solar photovoltaic, building automation, thermoacoustic power generation and green solar cells. A cross-disciplinary approach has been adopted, incorporating aspects of electrical engineering, mechanical engineering, chemistry, environmental sciences, among other fields to engineer and develop new materials and devices to efficiently harness sustainable energy.

                       Solar Cells                 Solar Intermittency using super capacitors

Equipments and Facilities:
Solar Simulator AAA | Solar Irradiance Measurement System | Laser Vibrometer | Rapid Prototyping Machine for 3D Printing

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Terahertz Imaging and Spectroscopy

Research in Terahertz spectroscopy includes studying the THz resonances of organic molecules with an aim to design unique molecules which will show resonances in the THz region for THz tags applications. In addition, THz spectroscopy is used as a vital tool to study various systems: Water absorption and retention of pristine and hybrid Nafion membranes to quantify the bulk and bound water content in the membranes to gain better understanding of transport mechanisms in Proton Electrolytic Membrane fuel cells, studies of various polymorphs for pharmaceutical applications, concrete hydration studies for understanding the reaction kinetics in concrete and to engineer concrete materials with low cost, higher strength and durability. In addition, Terahertz imaging is also used for non-intrusive inspection of  concrete for the detection of internal defects.

                      THz                  Engineering ThZ Resonances of Molecules

Equipments and Facilities:
Continuous Wave Terahertz System (0.1 – 1.8 THz) | Pulsed Terahertz System ( up to 3 THz) | Auto – Correlator | Fourier Transform Infrared Spectroscopy System with ATR Module System (FIR to NIR Range)

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Equipments and Facilities:

Ocean Optics Spectrometer | Spectrofluorometer |  3D Printer

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Portable Diagnostics – Non-Invasive BP Monitoring

The aim of this project is to develop a wearable device that can measure non-invasive beat to beat Blood Pressure (BP) with minimum discomfort. The device should be able to measure, record and track trends in the blood pressure over time. From large amounts of such data collected, health profiles of specific populations can be constructed and can facilitate the implementation of personalized healthcare and hypertension predisposition diagnostics to save millions of lives. In addition, novel bio-feedback will be integrated so that the deleterious effects of hypertension can be minimized with  the patient intervention at an early stage of the disease.

                 Block-Diagram-BP          9-1

Equipments and Facilities:
Oscillometric BP-Monitor | Portable 12 Lead ECG Machine | Keil and Altium Softwares
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