Research

 We prepare the levitated system in coupled-mode configuration and study its dynamics. The coupled-mode configuration is achieved by coupling the azimuthal modes (x-mode and y-mode) via periodic rotation of transverse trapping potential along the z-direction with a very small angle. We then use this configuration to study, PT-Symmetry, simultaneous phonon lasing, mechanical Q-switching, and tunable force sensing. Phys. Rev. A 105, 043505 (2022); J. Phys. B: At. Mol. Opt. Phys. 55, 245401 (2019); Opt. Express 32, 14735-14745 (2024).

We show the creation of a Schrödinger cat state in a levitated nanodiamond system. A nanodiamond suspended in the air using optical tweezers is considered a levitated system. The nanodiamond is trapped in harmonic potential in all three directions. For the creation of such states, we induce a Kerr-type nonlinear potential by applying a magnetic field gradient to the nanodiamond along the z-direction. We then prepare the nanodiamond in a coherent state and let it evolve in the Kerr-type potential to observe the formation of the Schrödinger cat state. J. Opt. Soc. Am. B 37, 1620-1629 (2020).

In this work, by using quantum coherence effects arising due to the interaction of light with atomic vapors, we spatially structure the intensity profile of Laguerre-Gaussian (LG) beams. For this, we azimuthally modulate the absorption properties of the atomic vapor to create periodically varying transparency windows. This periodically varying transparency window helps in creating LG beams with different spatial structures. Phys. Rev. A 96, 033811 (2017); J. Opt. Soc. Am. B 36, 960-965 (2019).

 This work deals with the interaction of light with atomic vapors wherein we show diffraction control of arbitrary light modes propagating through the atomic vapor. The key idea is to create a waveguide inside the medium using spatial-dependent strong control beams. This induced waveguide can now support diffraction-less propagation of arbitrary modes of a weak probe beam. Phys. Rev. A 96, 053813 (2017); Phys. Rev. A 107, 023701 (2023).