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Laser Physics Letters

Dynamics of induced optical torque via optical vortex light

Sh Askar, Dheyaa Jumaah Jasim, Ameer H. Al‐Rubaye, F Ochilov, Ravindra Pratap Singh, Ashok Kumar, Ahmed Read Al-Tameemi, Carlos Rodriguez‐Benites, Enas R. Alwaily, Ahmed Alawadi

Published Apr 18, 2024• 4 citations
Publisher

Abstract

Abstract This paper investigates the dynamics of induced torque in Nitrogen-Vacancy (NV) centers interacting with two weak optical vortex beams as well as a strong control field, exploring the impact of different system parameters such as control field intensity, detuning, magnetic field, and vortex beam strength. We find a dispersive torque behavior, indicating the sensitivity of NV centers to control parameters. Magnetic field induces level splitting, leading to a transformative effect on torque, with notable enhancements observed at specific intensities. Additionally, non-resonant torque is explored, demonstrating the controllability of torque peaks through magnetic field manipulation. Unequal strengths of vortex beams is found to yield substantial enhancements in torque. These results provide crucial insights into the induced torque dynamics in NV centers, presenting opportunities for optimized torque-based applications in quantum systems.

DOI
10.1088/1612-202x/ad3cbf

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Abstract This paper investigates the dynamics of induced torque in Nitrogen-Vacancy (NV) centers interacting with two weak optical vortex beams as well as a strong control field, exploring the impact of different system parameters such as control field intensity, detuning, magnetic field, and vortex beam strength. We find a dispersive torque behavior, indicating the sensitivity of NV centers to control parameters. Magnetic field induces level splitting, leading to a transformative effect on torque, with notable enhancements observed at specific intensities. Additionally, non-resonant torque is explored, demonstrating the controllability of torque peaks through magnetic field manipulation. Unequal strengths of vortex beams is found to yield substantial enhancements in torque. These results provide crucial insights into the induced torque dynamics in NV centers, presenting opportunities for optimized torque-based applications in quantum systems.
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This study investigates the induced torque on a quantum well (QW) system under the influence of optical vortex beams, exploring its dependence on various system parameters. Numerical simulations reveal distinct behaviors of the torque function concerning detunings, coupling field intensity, decay rates, and probability amplitudes of quantum states. The torque exhibits quantized characteristics, with its magnitude varying significantly based on these parameters. Specifically, the torque reaches maximum values under specific conditions of negative probe detuning and optimal signal field intensity, forming pronounced doughnut-shaped patterns indicative of optical dipole potential traps. These findings underscore the intricate interplay between light–matter interactions and mechanical responses, offering insights into optimizing QW systems for advanced technological applications.
We investigate the generation of optical torque in coherently prepared multi-level atomic media driven by a vector vortex beam composed of two counter-rotating components carrying opposite orbital angular momenta, +lℏ+l\hbar+lℏ and −lℏ-l\hbar−lℏ. We consider a three-level ΛΛΛ configuration and a four-level tripod configuration. Using a perturbative steady-state solution of the optical Bloch equations, we obtain analytical expressions for both linear and nonlinear contributions to the optical torque. The results show that the torque is strongly controlled by atomic coherence, including the initial population imbalance and the relative phase between the vortex components. Nonvanishing torque can arise even when the two components have equal amplitudes, due to coherence-induced asymmetry in the atomic response. In the tripod configuration, the presence of a strong control field leads to electromagnetically induced transparency, which suppresses the torque near resonance and shifts the dominant response to finite detunings. These results establish a route for controlling light-induced rotational dynamics in atomic media using vector vortex fields, with potential applications in coherent optical manipulation and angular-momentum-based control in quantum systems.
Abstract This work introduces a novel model to manipulate electromagnetically induced gratings within systems based on nitrogen-vacancy (NV) centers. The system is driven by coherent laser sources comprising a weak probe and standing-wave-patterned coupling fields aligned along the x and y axes, which induce spatial modulation of the refractive index, resulting in the emergence of Fraunhofer diffraction. Our investigation delves into the modulation and diffraction behaviors of transmitted light within the NV system, with a focus on examining the influence of various parameters, particularly magnetic fields. Our findings highlight how magnetic fields strongly influence the transmitted light, altering its intensity and phase characteristics, as well as the resulting diffraction structure. Specifically, we observe a notable redistribution of energy between zero and higher diffraction orders as the magnetic field deviates from zero, showcasing the versatility of magnetic field as a tool for manipulation of diffraction grating powers, thereby offering flexibility in optical output engineering. These findings open new avenues for precise tuning and performance enhancement of resonant optical systems, with potential applications spanning photonic technologies and optical signal manipulation.
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