Welcome to my webpage. I am a Professor of Photonics at Optics and Photonics Centre, IIT Delhi, a senior member of Optica and IEEE. My research group is primarily involved in studies related to optical mode interaction with the environment as well as among themselves. We have experties in developing photonic sensors and solutions for measuring minute changes in physical parameters, e.g. temperature, micro-strain, vibration, pressure, refractive-index of fluids. We also have experties in developing sensors and solutions for detecting various bio-chemical reagents, e.g. E. coli bacteria, microcystin-LR molecules, and cyanobacteria etc. in liquid phase. We possess IPs on a number of important discoveries and methods including two US patents on optical sensors and methods. 

Prior to joining IIT Delhi, I worked as Associate Professor (2019-2022) and Assistant Professor (2014-2019) at Department of Physics, IIT Kanpur, where we developed world's first inherently temperature insensitive fiber-optic sensor for an accurate detection of E. coli bacteria in water. The sensor operates accurately over large temperature fluctuations ~40 °C, and can detect E. coli concentrations as small as 100 cfu/ml in approximately 20 minutes of time. For more details about this work please click here.

We also made discoveries related to the existance of various specific wavelengths around which the photonic sensors are most sensitive as well as the wavelengths at which the sensors show least sensitivity. More details could be obtained from my series of publications on directional coupler based sensors under publication section. 

We can provide sensor solutions and case studies related to Fiber Bragg Gratings (FBG), Long-Period Gratings (LPGs), Directional Couplers (DC), Plasmonics, and Metamaterials. 

You may contact me at smt@opc.iitd.ac.in