52 citations · 131 across the 9 of their papers we have counts for
10 papers
LWGNet: Learned Wirtinger Gradients for Fourier Ptychographic Phase Retrieval
Atreyee Saha, Salman S Khan, Sagar Sehrawat +3
Fourier Ptychographic Microscopy (FPM) is an imaging procedure that overcomes the traditional limit on Space-Bandwidth Product (SBP) of conventional microscopes through computation…
Vector mode decay in atmospheric turbulence: a quantum inspired analysis
Isaac Nape, Nikiwe Mashaba, Nokwazi Mphuthi +3
Vector beams are inhomogeneously polarized optical fields with nonseparable, quantum-like correlations between their polarisation and spatial components, and hold tremendous promis…
All-Digital Stokes Polarimetry with a Digital Micro-mirror Device
Amogh Manthalkar, Isaac Nape, Najmeh Tabebordbar +4
Stokes polarimetry is widely used to extract the polarisation structure of optical fields, typically from six measurements, although it can be extracted from only four. To measure…
A compact single channel interferometer to study vortex beam propagation
Sruthy J. Lathika, A. Vijayakumar, Shanti Bhattacharya
We propose and demonstrate a single channel interferometer that can be used to study how vortex beams propagate. The interferometer consists of a multifunctional diffractive optica…
Improving Dynamic Range of Speckle Correlation based Optical Lever by spatial multiplexing
Vijayakumar Anand, Shanti Bhattacharya, Joseph Rosen
Speckle correlation based optical levers SC OptLev possess attractive characteristics suitable for sensing small changes in the angular orientations of surfaces. In this study, we…
Dielectric cross-shaped resonator based metasurface for vortex beam generation in Mid-IR and THz wavelengths
Raghu Dharmavarapu, Ken-ichi Izumi, Ikufumi Katayama +7
Metasurfaces are engineered thin surfaces comprising two dimensional (2D) arrays of sub-wavelength spaced and sub-wavelength sized resonators. Metasurfaces can locally manipulate t…
Implementation of a speckle correlation based optical lever (SC-OptLev) with extended dynamic range
A. Vijayakumar, D. Jayavel, M. Muthaiah +2
A speckle correlation based optical lever (SC-OptLev) is constructed for the measurement of small changes in the angle of orientation of a surface. The dynamic range of SC-OptLev i…
GDoeSII: Open source software for design of diffractive optical elements and conversion to GDSII lithography files
Raghu Dharmavarapu, Shanti Bhattacharya, Saulius Juodkazis
We develop an open source software "GDoeSII" for the simulation of Fresnel (near field) and Fraunhofer (far field) diffraction integrals of diffractive optical elements (DOE). It c…
All-dielectric metasurface for wavefront control at terahertz frequencies
Raghu Dharmavarapu, Soon Hock Ng, Shanti Bhattacharya +1
Recently, metasurfaces have gained popularity due to their ability to offer a spatially varying phase response, low intrinsic losses and high transmittance. Here, we demonstrate nu…
Engineering the axial intensity of Bessel beams
Raghu Dharmavarapu, Saulius Juodkazis, Shanti Bhattacharya
Bessel beams (BBs) appear immune to diffraction over finite propagation distances due to the conical nature of light propagation along the optical axis. This offers promising advan…