8 papers
Tunable Optical Torque by Asymmetry-Induced Spin-Hall Effect in Tightly Focused Spinless Gaussian Beams
Sauvik Roy, Ram Nandan Kumar, Biswajit Das +3
A linearly polarized Gaussian beam, carrying zero net spin angular momentum, is conventionally not expected to exert optical torque or induce rotational motion in birefringent micr…
High precision micro-optical elements on fiber facets via focused-ion beam machining
Raman Kumar, Sebastian Will
Fiber-integrated micro-optical elements promise a scalable approach to photon collection and beam shaping for quantum information processing. Here, we demonstrate single-step micro…
Micromotors Driven by Spin-Orbit Interaction of Light: Mimicking Planetary Motion at the Microscale
Ram Nandan Kumar, Jeeban Kumar Nayak, Subhasish Dutta Gupta +2
We introduce a new class of optical micromotors driven by the spin-orbit interaction of light and spin-driven fluid flows leading to simultaneous rotation and revolution of the mic…
Spatially resolved spin angular momentum mediated by spin-orbit interaction in tightly focused spinless vector beams in optical tweezers
Ram Nandan Kumar, Sauvik Roy, Subhasish Dutta Gupta +2
We demonstrate an effective and optimal strategy for generating spatially resolved longitudinal spin angular momentum (LSAM) in optical tweezers by tightly focusing first-order azi…
A rectangular loop interferometer for scalar optical computations and controlled generation of higher-order vector vortex modes using spin-orbit interaction of light
Ram Nandan Kumar, Gaurav Verma, Subhasish Dutta Gupta +2
We have developed a rectangular loop interferometer (RLI) that confines light in a rectangular path and facilitates various interesting applications. Such a device can yield the su…
Inhomogeneous spin momentum induced orbital motion of birefringent particles in tight focusing of vector beams in optical tweezers
Ram Nandan Kumar, Sauvik Roy, Anand Dev Ranjan +3
Spin orbit interaction (SOI) due to tight focusing of light in optical tweezers has led to exciting and exotic avenues towards inducing rotation in microscopic particles. However,…
Probing inhomogeneous and dual asymmetric angular momentum exploiting spin-orbit interaction in tightly focused vector beams in optical tweezers
Ram Nandan Kumar, Jeeban Kumar Nayak, Anand Dev Ranjan +3
The spin-orbit interaction (SOI) of light generated by tight focusing in optical tweezers has been regularly employed in generating angular momentum - both spin and orbital - in tr…
Probing the rotational spin-Hall effect in higher order Gaussian beams
Ram Nandan Kumar, Yatish, Subhasish Dutta Gupta +2
Spin-to-orbit conversion of light is a dynamical optical phenomenon in non-paraxial fields leading to various manifestations of the spin and orbital Hall effect. However, effects o…