46 citations · 125 across the 16 of their papers we have counts for
13 papers · 1 filter
OAM-mode sorting with a wavefront twister
Suman Karan, Swati Chaudhary, Harshwardhan Wanare +1
We propose an OAM sorter based on a novel optical element that we refer to as a wavefront twister. It is a generalization of the conventional wavefront rotators such as the Dove pr…
Direct Determination of Photonic Stopband Topological Character: A Framework based on Dispersion Measurements
Nitish Kumar Gupta, Sapireddy Srinivasu, Mukesh Kumar +4
Ascertainment of photonic stopband absolute topological character requires information regarding the Bloch eigenfunction spatial distribution. Consequently, the experimental invest…
Controlling propagation of spatial coherence for enhanced imaging through scattering media
Abhinandan Bhattacharjee, Shaurya Aarav, Harshawardhan Wanare +1
It is known that a spatially partially coherent light field produces better imaging contrast compared to a spatially coherent field and that the contrast increases as the spatial c…
Angular Lens
Rishabh Sahu, Swati Chaudhary, Kedar Khare +3
We propose a single phase-only optical element that transforms different orbital angular momentum (OAM) modes into localized spots at separated angular positions on a transverse pl…
Efficient generation of propagation-invariant spatially-stationary partially coherent fields
Shaurya Aarav, Abhinandan Bhattacharjee, Harshawardhan Wanare +1
We propose and demonstrate a novel method for generating propagation-invariant spatially-stationary fields in a controllable manner. Our method relies on producing incoherent mixtu…
Enhanced propagation of photon density waves in random amplifying media
Lalruatfela Renthlei, Harshawardhan Wanare, S. A. Ramakrishna
We demonstrate enhanced wave-like character of diffuse photon density waves (DPDW) in an amplifying random medium. The amplifying nature makes it contingent to choose the wave solu…
Optical instabilities in three-level lambda and V system inside double-cavity
H. Aswath Babu, Harshawardhan Wanare
We obtain optical instabilities in all-optical bistable systems arising from competing cooperative pathways at low input light levels. In particular for three-level atomic systems…
Coherent control of the refractive index using optical bistability
H. Aswath Babu, Harshawardhan Wanare
Refractive index and absorption experienced by a probe field propagating through a three-level atomic medium can be effectively manipulated by the bistable behavior of a control fi…
Non-linear magneto-optic and self polarization rotation by superposition of states
S. Pradhan, A. Kani, Harshawardhan Wanare +2
We report the observation of enhanced magneto-optic rotation as the coherent superposition of different hyperfine states is established in an atomic sample. The polarization rotati…
Negative and positive hysteresis in double-cavity optical bistability in three-level atom
H. Aswath Babu, Harshawardhan Wanare
We present novel hysteretic behaviour of a three-level ladder atomic system exhibiting double-cavity optical bistability in the mean-field limit. The two fields coupling the atomic…
Controlling Metamaterial Resonances with Light
Sangeeta Chakrabarti, S. Anantha Ramakrishna, Harshawardhan Wanare
We investigate the use of coherent optical fields as a means of dynamically controlling the resonant behaviour of a variety of composite metamaterials, wherein the metamaterial str…
Switching a plasma-like metamaterial via embedded resonant atoms exhibiting electromagnetically induced transparency
Sangeeta Chakrabarti, S. Anantha Ramakrishna, Harshawardhan Wanare
We theoretically demonstrate control of the plasma-like effective response of a metamaterial composed of aligned metallic nanorods when the electric field of the incident radiation…
Gain without population inversion in V-type systems driven by a frequency-modulated field
Harshawardhan Wanare
We obtain gain of the probe field at multiple frequencies in a closed three-level V-type system using frequency modulated pump field. There is no associated population inversion am…