36 citations · 116 across the 15 of their papers we have counts for
15 papers
A stochastic heat engine driven using a nonlinear protocol
Amrutayani Panda, Biswajit Das, Shuvojit Paul +2
A colloidal particle confined in a time-dependent optical trap can function as a microscopic heat engine, with optimization strategies playing a crucial role in enhancing its perfo…
Simultaneous active and diffusive behaviour of asymmetric microclusters in a photophoretic trap
Anita Pahi, Kirty Ranjan Sahoo, Biswajit Das +2
Active and diffusive motion in Brownian particles are regularly observed in fluidic environments, albeit at different time scales. Here, we experimentally study the dynamics of hig…
Decoding active force fluctuations from spatial trajectories of active systems
Anisha Majhi, Biswajit Das, Subhadeep Gupta +4
Mesoscopic active systems exhibit various unique behaviours - absent in passive systems - due to the forces generated by the corresponding constituents by converting their availabl…
A study of the coupled dynamics of asymmetric absorbing clusters in a photophoretic trap
Anita Pahi, Shuvojit paul, Ayan Banerjee
We report a study on the dynamics of absorbing asymmetric carbon clusters trapped by a loosely focused Gaussian beam using photophoretic force. At high laser powers, all the trappe…
Irreversibility of mesoscopic processes with hydrodynamic interactions
Biswajit Das, Sreekanth K Manikandan, Shuvojit Paul +3
Optically confined colloidal particles, when placed in close proximity, form a dissipatively coupled system through hydrodynamic interactions. The role of such interactions influen…
Enhanced directionality of active processes in a viscoelastic bath
Biswajit Das, Shuvojit Paul, Sreekanth K. Manikandan +1
Active fluctuations are known to play a significant role in the intracellular transport of passive objects. However, the effect of viscoelasticity of the environment in shaping suc…
Force generation in confined active fluids: The role of microstructure
Shuvojit Paul, Ashreya Jayaram, N Narinder +2
We experimentally determine the force exerted by a bath of active particles onto a passive probe as a function of its distance to a wall and compare it to the measured averaged den…
Single-shot wideband active microrheology of viscoelastic fluids using pulse-scanned optical tweezers
Shuvojit Paul, Avijit Kundu, Ayan Banerjee
We present a fast active microrheology technique exploring the phase response of a microscopic probe particle trapped in a linear viscoelastic fluid using optical tweezers under an…
Active microrheology to determine viscoelastic parameters of Stokes-Oldroyd B fluids using optical tweezers
Shuvojit Paul, Avijit Kundu, Ayan Banerjee
We use active microrheology to determine the frequency dependent moduli of a linear viscoelastic fluid in terms of the polymer time constant (), and the polymer () and solv…
A quantitative analysis of the emergence of memory in the viscously coupled dynamics of colloids
Shuvojit Paul, Randhir Kumar, Ayan Banerjee
We provide a quantitative description of the evolution of memory from the apparently random Markovian dynamics of a pair of optically trapped colloidal microparticles in water. The…
Dynamics of hydrodynamically coupled Brownian harmonic oscillators in a Maxwell fluid
Shuvojit Paul
Recently, many interesting features of the hydrodynamically coupled motions of the Brownian particles in a viscous fluid have been reported which are impossible for the uncoupled m…
Microscopic approach to understand Brownian dynamics in viscoelastic fluid
Shuvojit Paul, Basudev Roy, Ayan Banerjee
We present an entirely microscopic formulation of viscoleasticity of a fluid starting from the microscopic Stokes-Oldroyd B Model assuming instantaneous hydrodynamic friction, and…
Two-point active microrheology in a viscous medium exploiting a motional resonance excited in dual-trap optical tweezers
Shuvojit Paul, Randhir Kumar, Ayan Banerjee
Two-point microrheology measurements from widely separated colloidal particles approach the bulk viscosity of the host medium more reliably than corresponding single point measurem…
Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators
Shuvojit Paul, Abhrajit Laskar, Rajesh Singh +3
The fluctuation-dissipation relation, a central result in non-equilibrium statistical physics, relates equilibrium fluctuations in a system to its linear response to external force…
Fast Bayesian inference of optical trap stiffness and particle diffusion
Sudipta Bera, Shuvojit Paul, Rajesh Singh +4
Bayesian inference provides a principled way of estimating the parameters of a stochastic process that is observed discretely in time. The overdamped Brownian motion of a particle…