2018
Nanoscale virtual potentials using optical tweezers
Kumar A, Bechhoefer J. Nanoscale virtual potentials using optical tweezers. Applied Physics Letters 2018, 113: 183702. DOI: 10.1063/1.5055580.Peer-Reviewed Original ResearchDouble-well potentialOptical tweezersOptical tweezers techniqueSpatial light modulatorAdjustable barrier heightOptical trapVirtual potentialFeedback trapLight modulatorTrap centersHarmonic potentialIsotropic trapDual beamBarrier heightParticle positionsArbitrary potentialTweezersColloidal particlesLength scalesTrapsWell separationParticlesBeamModulatorPotentialOptical feedback tweezers
Kumar A, Bechhoefer J. Optical feedback tweezers. 2018, 10723: 107232j. DOI: 10.1117/12.2323837.Peer-Reviewed Original ResearchFeedback trapOptical trapAcoustooptic deflectorTime-shared optical tweezersDouble-well potentialVirtual potentialOptical tweezersLaser powerPosition detectorTrap positionBarrier heightParticle positionsArbitrary potentialTweezersObserved fluctuationsTrapsParticlesWell separationIndependent controlDeflectorLoop rateDetectorPreliminary experimentsHydrodynamic forcesFeedback force
2017
Dual-mode optical fiber-based tweezers for robust trapping and manipulation of absorbing particles in air
Sil S, Saha T, Kumar A, Bera S, Banerjee A. Dual-mode optical fiber-based tweezers for robust trapping and manipulation of absorbing particles in air. Journal Of Optics 2017, 19: 12lt02. DOI: 10.1088/2040-8986/aa9296.Peer-Reviewed Original Research
2016
Simultaneous measurement of mass and rotation of trapped absorbing particles in air.
Bera S, Kumar A, Sil S, Saha T, Saha T, Banerjee A. Simultaneous measurement of mass and rotation of trapped absorbing particles in air. Optics Letters 2016, 41: 4356-9. PMID: 27628396, DOI: 10.1364/ol.41.004356.Peer-Reviewed Original ResearchSpectral densityPhotophoretic forceVelocity autocorrelation functionLaser powerRotation frequencyParticle massMean squared displacementPower spectral densityResonance frequencySpontaneous rotationLangevin equationSimultaneous measurementBody forceClear peakParticle clustersAutocorrelation functionSquared displacementReasonable accuracyBrownian motionDensityParticlesBeamRotationAirAnalytical functions