WELCOME TO MY WEBPAGE!
The current focus of my research is on understanding and exploiting the dynamics of micro and nano scale mechanical structures in MEMS and NEMS devices. In particular, I am interested in the development of dynamic sensors at micro and nano scales for a host of applications in acoustics, ultrasonics, inertial navigation and medical diagnostics. At small scales, mechanical structures such as beams, plates, membranes, etc., commonly used in MEMS and NEMS devices have very high natural frequencies (ranging from a few KHz to a few GHz). This frequency range of application is fairly new to mechanical design. At such frequencies, we need to pay attention to phenomena generally ignorable at macro scales. The need for realizing very high Q devices requires careful study of energy dissipation at micro and nano scales. In recent years, my research group has devoted considerable effort on advancing the current understanding of squeeze film damping and acoustic damping in MEMS devices.
The need for integrating self-sensing in MEMS and NEMS devices has prompted us to look at appropriate piezoresistive and piezoelectric materials that could be conveniently used in these devices. We have explored ways of enhancing piezoresistive sensitivity of thin metallic films and lines with nanoscale inhomogenization using electromigration. Our continuing work on controlled electromigration has led to developing it as a tool for material transport at nanoscales with some fascinating applications in patterning.
Another area that we are currently exploring vigorously is that of mechanobiology. On one hand, we are interested in understanding design templates of natural small scale transducers that animals and insects use, and on the other hand, we are exploring the dynamics of biological cells for developing mechano-diagnostic tools for pathology identification. Our current research on bio-acoustics of crickets is focused on understanding the design of transducers involved in cricket song production. We are also studying the incredibly smart design of angular rate sensing halters in dipteran insects. These studies are motivated by our desire to learn design principles of multifunctional natural transducers.