15 citations · 16 across the 6 of their papers we have counts for
6 papers
Higher order topological degeneracies and towards unique successive state-switching in a four-level open system
Sayan Bhattacherjee, Harsh K. Gandhi, Arnab Laha +1
The physics of topological singularities, namely exceptional points (EPs), has been a key to wide range of intriguing and unique physical effects in non-Hermitian systems. In this…
Optical waveguide hosting multiple exceptional points: Toward selective mode conversion
Arnab Laha, Harsh K. Gandhi, Sibnath Dey +3
We investigate the astonishing physical aspects of Exceptional Points (EPs) in a 1D planar few-mode optical waveguide. The waveguide hosts four quasi-guided modes. Here interaction…
Origin of third order exceptional singularities and its signature in successive state conversion
Sayan Bhattacherjee, Arnab Laha, Somnath Ghosh
We report an open three-state perturbed system with quasi-statically varying Hamiltonian depending on the topological parameters. The effective system hosts two second order except…
Realization of Third Order Exceptional Singularities in a Three level non-Hermitian System: Towards Cascaded State Conversion
Sayan Bhattacherjee, Arnab Laha, Somnath Ghosh
The appearance of topological singularities, namely exceptional points (EPs) is an intriguing feature of parameter-dependent open quantum or wave systems. EPs are the special type…
Three State Quantum System Exhibiting Third Order Exceptional Singularities and Flip-of-States
Sayan Bhattacherjee, Arnab Laha, Somnath Ghosh
A quantum inspired open optical system is mathematically implemented with an analogous three state non-Hermitian Hamiltonian exhibiting two special avoided-resonance-crossings; whe…
Towards Ultra-Large Bandwidth and a New Class of Specialty Optical Fibers
Sayan Bhattacherjee, Abhijit Biswas, Somnath Ghosh
We propose a scheme to enhance the effective photonic bandwidth exploiting bandgap overlapping of same order or different orders through judiciously chosen aperiodic geometries is…