Unconventional micro/nano-photonic systems: From fundamentals to applications

  From fundamental physics point of view and applications in photonics like realizing compact random lasing in one dimensional disordered system (longitudinal direction mapped onto time), I plan to focus on my findings to demonstrate transverse Anderson-type localization of light. This study has revealed several underlying interesting features of light confinement to a localized state in such a medium of finite length and showed that beyond the point of localization, light indeed propagates without any diffractive spread in the transverse direction in a disordered lattice, a feature that mimics waveguide-like propagation. The hallmark stochastic nature of the phenomena has been encountered in both simulations and experiments using ultrafast laser inscription (ULI) technique.
Corroborating the analogy between non-Hermitian quantum system and counterpart optical geometries with suitable amount of simultaneous gain and loss, I plan to discuss an innovative scheme for asymmetric mode conversion in a coupled optical system under certain condition in the strong coupling regime (beyond the PT symmetry limit) exploiting singularities (in eigen values and eigen vectors) associated with avoided crossings (in the regime where adiabatic evolution fails) as an efficient tool. Novel propagation dynamics of light wave through this special optical structure is evident, which is being explored in the context of on-chip photonics applications. 
Designing of various specialty fibers for certain potential applications is highly significant in contemporary research. These involve photonic bandgap microstructured optical fibers, which have been designed for specificity through bandgap engineering with a chirped cladding. Our proposed several designs for all-fiber mid-IR monochromatic, broadband as well as discrete wavelength supercontinuum CW/ pulsed sources based on inherent nonlinear effects of the fibers are expected to be the building blocks for next generation mid-IR photonics. My recent proposal of high-quality low noise optical cavity via interaction of proximity resonances would be extremely useful for designing high performances optical cavities to study novel optical/quantum phenomena.