Fundamental aspects of polarization or spin optical effects are investigated both theoretically and experimentally. We have an inhouse Mueller matrix measuring system both in imaging and spectral domain. Determination of Mueller matrix helps in characterizing the polarization response of the samples we are dealing with, thereby helps in understanding various light matter interaction. Apart from the traditional Stokes vector determination which involved multiple measurement we are also interested in an alternative technique which can do the polarization measurement for some highly dynamical systems. This technique works based on the basic principle of spin-orbit interaction and generation of geometric phase. Beside polarization measurement our new direction is toward developing simultaneous orbital angular momentum and spin angular momentum measuring devices.

Weak Value amplification got considerable attention, specifically, in the domain of optics since the last two decades, to amplify and detect tiny optical effects. We use classical light to perform quantum weak measurement that enables considerably significant amplification of extremely tiny spin-optical effects, offers dramatic control over resonance phenomena, and opens up a novel route towards the development of spin-photonic metadevices. We have also applied this enhancement technique to implement a new concept of weak value polarimeter, which is capable of enhanced detection of small sample polarization effects breaking conventional limits of traditional polarimeters.

Investigating light-matter interaction in nano-meter length scale has opened up a new paradigm in the growing research endeavor where the properties of light can be manipulated in the sub-wavelength length scale. Besides tailoring various properties of light like intensity, wavevector distribution, polarization, it has a wide range of applications in sensing, communication, data-storage devices, bio-medical applications, etcetera. The booming development in the field of nano-fabrication has been the essential fuel for this emerging field. Our group focuses on the detailed investigation of different optical responses of various nanostructures, the under lying physics, and their real-world applications. Meta-surfaces and meta-materials with a sophisticated manipulation of different properties of light were demonstrated using phenomena like spin-orbit interactions, Fano resonance, Weak measurement. Alongside these, we also work towards the development of novel polarization-resolved spectroscopy and imaging systems to assist us in our experimental exploration and characterization of multifunctional tunable nano-optics devices.

We use FEM and FDTD methods to simulate nano structure and study polarization dpendent spectral modification of the scattering of these samples. Simulation of the desired structures provide the fine tuning of the parameters of the structures which help us to fabricate it precisely.