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  • Perumangatt, Chithrabhanu; Aadhi, A.; Reddy, Salla Gangi; Prabhakar, Shashi; Singh, R. P. (World Scientific Publishing, 2016-09)
    Using classical laser beams, we generate a general complex superposition state, cebit, of orbital angular momentum (OAM) of light. We use a nonseparable beam of polarization and OAM generated by a modified Sagnac interferometer ...
  • Srinivas, P.; Perumangatt, Chithrabhanu; Lal, Nijil; Singh, R. P.; Srinivasan, B. (Optical Society of America, 2018-06)
    In this Letter, we experimentally investigate the propagation dynamics of truncated vector vortex beams generated using a Sagnac interferometer. Upon focusing, the truncated vector vortex beam is found to regain its original ...
  • Lal, Nijil; Shajilal, Biveen; Anwar, Ali; Perumangatt, Chithrabhanu; Singh, R. P. (Cornell University Library, 2019-07)
  • Lal, Nijil; Shajilal, Biveen; Anwar, Ali; Perumangatt, Chithrabhanu; Singh, R. P. (AIP Publishing, 2019-11)
    Heralded single photon sources (HSPSs) from spontaneous parametric down-conversion are widely used as single photon sources. We study the photon number statistics of an HSPS carrying orbital angular momentum in our laboratory ...
  • Perumangatt, Chithrabhanu; Lal, Nijil; Anwar, Ali; Reddy, Salla Gangi; Singh, R. P. (Elsevier, 2017-06)
    We address the possibility of using even/odd states of orbital angular momentum (OAM) of photons for the quantum information tasks. Single photon qubit states and two photon entangled states in even/odd basis of OAM are ...
  • Perumangatt, Chithrabhanu; Lal, Nijil; Anwar, Ali; Reddy, Salla Gangi; Singh, R. P. (Cornell University Library, 2016-07)
    We address the possibility of using even/odd states of orbital angular momentum (OAM) of photons for the quantum information tasks. Single photon qubit states and two photon entangled states in even/odd basis of OAM are ...
  • Salla, Gangi Reddy; Perumangatt, Chithrabhanu; Prabhakar, Shashi; Anwar, Ali; Singh, Ravindra P. (AIP Scitation, 2015-07)
    We generate optical vortices and scatter them through a rough surface. However, the scattered light passing through a lens shows the same vorticity when probed at the Fourier plane. The vorticity is measured using a ...
  • Lal, Nijil; Anwar, Ali; Salla, Gangi Reddy; Singh, Ravindra P.; Perumangatt, Chithrabhanu (Optical Society of America, 2016-12-04)
    We demonstrate a stabilized orbital angular momentum (OAM) sorter using polarizing Sagnac interferometer containing a single dove prism. The setup is stable against small misalignments and it is shown to separate complex ...
  • Prabhakar, Shashi; Salla, Gangi Reddy; Aadhi, A.; Perumangatt, Chithrabhanu; Samanta, Goutam Kumar; Singh, Ravindra P. (American Physical Society, 2015-08)
    We have considered optical beams with phase singularity and experimentally verified that these beams, although classical, have properties of two-mode entanglement in quantum states. We have observed the violation of Bell's ...

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