Further during April 1991 - December 1992 he has worked as Research Associate in Electrical Communication Engineering Department of Indian Institute of Science (IISc), Bangalore.

His major research area is Fiber Optics and Photonics and he is currently working on Nano-photonic Devices for Telecom and Sensing Applications.His recent book on Zero Index Metamterials is published in April 2021 (https://www.google.co.in/books/edition/Zero_Index_Metamaterials/h_QkEAAAQBAJ?hl=en&gbpv=1&printsec=frontcover ).

This technique was extended for developing new methods for characterization of single mode integrated planar and rectangular core channel optical waveguides from far field measurements.

This property enables one to control light with amazing facility and produce effects that are impossible with conventional optics.

This was experimentally realized using V-shaped split ring resonator made up of two-dimensional arrays of 50-nanometer-thick gold on n-doped silicon substrate.

It is shown that by changing the angular gap of V-shaped SRRs, it is possible to tune the electromagnetic parameters (such as dielectric permitivity, permeability and refractive index) and control the flow of light for design and development of metamaterial based optical switches and sensors at nano-scale.

SPPs have shorter wavelength than that of incident photons and hence provide strong spatial confinement with promising application in the design and development of sub nano-scale devices.

It is shown that proposed PMZI has very high sensitivity of the order of 6000 nm/RIU, which has been effectively used for label free classification and detection of cancer cell.

[43][44][45][46][47][48][49][50][51] Field Emission characteristics of Carbon Nanotube (CNT) & Nano-Bio Sensors: CNTs were grown using Inconel and silicon substrates and their field emission characteristics have been studied with a view of their promising applications for next generation high performance flat panel devices.

A single-step method for synthesis and deposition of gold nanostructures was developed for fabrication of a highly sensitive and selective cholesterol nano-biosensor.

[52][53][54][55] Photonic Crystal Fiber (PCF) & Supercontinuum generation: Prof. Sinha developed several analytical and numerical techniques for studying light wave propagation characteristics through specially designed photonic crystal fibers and developed experimental techniques for their characterization which have become topic of various text and reference books these days and very well cited by research community.