9 citations · 14 across the 11 of their papers we have counts for
11 papers · 1 filter
Probing the Broken Spatial Symmetry of a Stratified Medium with Structured Light
Arani Maiti, Sauvik Roy, Nirmalya Ghosh +2
We study theoretically near-symmetric resonant stratified media to show how a tiny broken spatial symmetry can effectively be probed by structured light with or without orbital ang…
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…
Surface Plasmon Mediated Giant Goos-Hanchen and Imbert-Fedorov Shifts on a Corrugated Metal Surface
Arani Maiti, Sauvik Roy, Abhi Mondal +3
Enhanced beam shifts mediated by surface plasmon resonance (SPR) at metal-dielectric interfaces have been widely investigated. However, research on the associated Imbert-Fedorov or…
Can a vector beam be critically coupled leading to perfect absorption?
Sauvik Roy, Nirmalya Ghosh, Ayan Banerjee +1
Critical coupling has emerged as a prominent area of research in recent years. However, most theoretical models are based on scalar theories (and occasionally coupled mode theories…
A comprehensive study of the Spin-Hall effect of tightly focused linearly polarized light through a stratified medium in optical tweezers
Sramana Das, Sauvik Roy, Subhasish Dutta Gupta +2
The optical Spin-Hall effect originates from the interaction between the spin angular momentum (SAM) and extrinsic orbital angular momentum (OAM) of light, leading to mutual interr…
Quasi-coherent perfect absorption of counter-propagating vector beams of finite spatial extent through an absorptive slab
Sauvik Roy, Nirmalya Ghosh, Ayan Banerjee +1
Coherent perfect absorption (CPA) has been a topic of considerable contemporary research interest. Most of the theoretical treatment of CPA with beams, to the best of our knowledge…
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…
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,…
Observation of Larmor-like precession of a single birefringent particle due to spin-dependent forces in tilted optical tweezers
Sauvik Roy, Nirmalya Ghosh, Ayan Banerjee +1
We observe clear precessional motion of highly birefringent liquid crystal (LC) particles trapped in a spherically aberrated optical trap which is built around a tilted refractive…
Manipulating the transverse spin angular momentum and Belinfante momentum of spin-polarized light by a tilted stratified medium in optical tweezers
Sauvik Roy, Nirmalya Ghosh, Ayan Banerjee +1
In the recent past, optical tweezers incorporating a stratified medium have been exploited to generate complex translational and rotational dynamics in mesoscopic particles due to…
Realizing negative index of refraction in an ensemble of ground-state polar molecules with lasers
Dibyendu Sardar, Sauvik Roy, Ghanasyam Remesh +2
We propose a coherent optical method for creating negative refractive index (NRI) for a gaseous ensemble of ground-state polar molecules possessing both permanent electric and magn…