Browsing Department of Physics by Author "Singh, Rakesh Kumar"

Browsing Department of Physics by Author "Singh, Rakesh Kumar"

Sort by: Order: Results:

  • Digital Fourier Transform Holography Using a Beam Displacer 
    Rathor, Mohit; Chaubey, Shivam Kumar; Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-06)
    Fourier transform holography overcomes the phase recovery challenge through recording complex field information of the object in an interference pattern recorded at the far field, i.e., Fourier plane. Moreover, this geometry ...
  • Digital Polarization Holography: Challenges and Opportunities 
    Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-04)
    Polarization has a profound impact on image quality and visual perception. For instance, polarization provides a new perspective on seeing an object which is otherwise obscured, low contrast or not measurable by conventional ...
  • Enhancing Phase Measurement by a Factor of Two in the Stokes Correlation 
    Yadav, Amit; Sarkar, Tushar; Suzuki, Takamasa; Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-05-23)
    Phase loss is a typical problem in the optical domain, and optical detectors only measure the amplitude distribution of a signal without its phase. However, an optimal phase is desired in a variety of practical applications, ...
  • Focused polarization ellipse field singularities: interaction of spin-orbital angular momentum and the formation of optical Möbius strips 
    Pal, Sushanta Kumar; Somers, Lavi; Singh, Rakesh Kumar; Senthilkumaran, P.; Arie, Ady (Institute of Physics, 2023-04-06)
    We study here the intensity distribution and formation of optical polarization Möbius strips by tightly focusing of C-point singularity beams. These beams are characterized by a central circular polarization point (C-point) ...
  • Ghost diffraction: A spatial statistical approach 
    ., Manisha; Tiwari, Vipin; Bisht, Nandan S.; Das, Bhargab; Singh, Rakesh Kumar (Elsevier B.V., 2022-09-17)
    We report a new method to reconstruct a two-dimensional object in Ghost diffraction scheme using a spatial statistical optics approach. This is implemented by using a static diffuser rather than a pseudo thermal light ...
  • Holography with Incoherent Light 
    Gautam, Akanksha; T S, Athira; Naik, Dinesh N.; Narayanmurthy C.S.; Singh, Rajeev; Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-04)
    Conventional digital holography uses the technique of combining two coherent light fields and the numerical reconstruction of the recorded hologram leads to the object amplitude and phase information. Despite significant ...
  • Imaging Incoherent Target Using Hadamard Basis Patterns † 
    Karmakar, Tanushree; Singh, Rajeev; Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-31)
    In this paper, we present a correlation-based imaging technique in a single-pixel imaging scheme using Hadamard basis illumination. The Hadamard basis, which has the characteristics of a two-bit value {−1, 1} and sparsity ...
  • Randomness assisted in-line holography with deep learning 
    Manisha; Mandal, Aditya Chandra; Rathor, Mohit; Zalevsky, Zeev; Singh, Rakesh Kumar (Nature Research, 2023-12)
    We propose and demonstrate a holographic imaging scheme exploiting random illuminations for recording hologram and then applying numerical reconstruction and twin image removal. We use an in-line holographic geometry to ...
  • Stokes correlation to estimate topological charge from the speckle pattern 
    Sarkar, Tushar; Singh, Rakesh Kumar (Springer Science and Business Media Deutschland GmbH, 2022-12-15)
    The orbital angular momentum (OAM) of the vortex or helical beam, connected with the topological charge (TC) of the beam, has been used as an alternative degree of freedom to encode and decode the information in the optical ...
  • Structured transmittance illumination coherence holography 
    Mandal, Aditya Chandra; Sarkar, Tushar; Zalevsky, Zeev; Singh, Rakesh Kumar (Nature Research, 2022-12)
    The coherence holography offers an unconventional way to reconstruct the hologram where an incoherent light illumination is used for reconstruction purposes, and object encoded into the hologram is reconstructed as the ...

Search in IDR


Advanced Search

Browse

My Account