Dr.V.Subramanian
Associate Professor,
Department of Physics,
Indian Institute of Technology - Madras,
Chennai - 600 036,
India.  
Ph:091-044-22574883 (Off): 22576883(Res)
Mobile: 9444009086 (Warden, Saraswathi Hostel)		 Dr.V.Subramanian
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ABOUT OUR LAB

I joined in the MICROWAVE LABORATORY of IIT, MADRAS as a Research Scholar on 18th August 1988 under the guidance of Prof. J. Sobhanadri. Initially I worked on the characterization of liquids using cavity perturbation technique though my doctoral program was on the studies of carrier lifetime in semiconductors using non-contact microwave techniques. I submitted my doctoral thesis in June 1994. I continued my work as a Project Associate till Feb. 1995. I obtained CSIR-Research Associateship and worked on the carrier lifetime on solar cells till 26th June 1997. Later, I joined back in the same lab as Assistant Professor on 24th Dec. 1998.

Prof. J. Sobhanadri started the Microwave Lab in 1960s. The lab has produced more than 30 Ph.D. so far apart from M.Tech and M.Sc. projects. The number of publications in refereed cross more than 250 spanning several areas of research viz. Liquids, Semiconductors, Ferrites, Dielectric Resonators, Ferroelectrics, Relaxor Ferroelectrics, Ultrasonics, Graphite Intercalation Compounds, ESR, EPR, NQR and Molecular Modelling.

Microwave Lab is well equipped with instruments necessary for the basic microwave material research and characterization.

    1. Microwave test benches

    1. 5 - 8 GHz J band

    2. 8 - 12 GHz X band

    3. 18 - 26 GHz K band

    4. 30 - 33 GHz Q band

    5. 70 GHz E band

    6. 140 GHz W band

    1. HP 8720A Microwave Vector Network Analyzer (0.13 - 20 GHz)

    2. Agilent Microwave Vector Network Analyzer (0.01 - 40 GHz)

    3. Zentec Digital LCZ meter (0.04 - 200 KHz)

    4. Questek 308 nm Excimer Laser (Presently not working)

    5. Laser Ablation Unit (not in operation)

    6. Keithley Digital Nanovoltmeter

    7. HP 100 MHz Digital Storage Oscilloscope

    8. L&T Gould 100 MHz Digital Storage Oscilloscope

    9. Mettler Toledo Digital Weighing Balance

    10. HP Microwave Frequency Counter

    11. Nabertherm 1700 deg. C microprocessor controlled furnace

    12. Nabertherm 1400 deg. C microprocessor controlled furnace

    13. Indfurnace 1200 deg. C PID controlled furnaces

    14. Indfurnace double zone furnace

    15. Microwave sintering unit

    16. Planetary ball mill

    17. Hand extruder to make thin dielectric and ferrite rods

    18. 250 deg. C oven

    19. Glove box

The lab has large number of indigenously built automatic experimental facilities with temperature variation using interfacing through PC.

MY VISION ABOUT THE LAB DEVELOPMENT

With large potential to do characterisation of materials at microwave frequencies, the present laboratory will be converted as CENTRE FOR MICROWAVE MATERIALS. The center will exclusively deal with the characterisation of different kind of materials viz, dielectrics, ferroelectrics, relaxors, semiconductors and liquids.

The lab, which already produces new materials, will also now concentrate on preparing microwave devices based on the materials. The exact preparation and experimental environments will be maintained for reproducibility and accuracy.


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