arXiv subjects

Ghaisud Din

Publications and source records attributed to Ghaisud Din.

5 recordsLinked to original sources

arXiv2026

Phonon-phonon interaction as a control knob for multimode splitting in a two mirror parametrically assisted optomechanical cavity

We study a driven optomechanical cavity with two movable mirrors and an intracavity optical parametric amplifier, focusing on how direct phonon-phonon coupling changes the observed normal-mode spectrum. Although the linearized system supports three hybrid modes, in the absence of direct mechanical coupling one collective mechanical mode contributes only weakly to the optical response, leading to an apparent two-peak structure. We show that finite phonon-phonon coupling mixes this weakly participating mode with the optically visible modes, making a third resonance clearly resolvable. This change appears in the mirror displacement spectrum, the output-field spectrum, and the output quadrature spectra, and becomes more pronounced with increasing coupling strength and drive power. Our results show that direct mechanical coupling provides a useful way to tune spectral visibility and multimode hybridization in two-mirror optomechanical cavity with intracavity parametric amplification.

physics.optics↗

arXiv2025

Goos-Hanchen Shift with a rotating atomic superfluid in a ring

We investigate the Goos Hanchen shift of the transmitted probe and show that optomechanical interference in a ring Bose Einstein condensate provides a sensitive, rotation tunable beam shift response at ultralow optical powers. Without quantized circulation, conventional optomechanically induced transparency produces a strictly positive and bounded shift whose magnitude is governed primarily by cooperativity; small detuning offsets can introduce a weak, transient sign change consistent with a Fano type asymmetry, but the overall response remains limited. With circulation, the Bragg scattered mechanical side modes split, yielding a double transparency dispersion with steep dispersive flanks that strongly amplify the phase derivative and bias its sign. In this regime, the peak shift grows monotonically with control field strength, reflecting enhanced linearized coupling and increased transmission across the angular scan. At fixed power, the detuning dependence is decisive: the shift is maximized at the red sideband condition and diminishes away from resonance, tracking how effectively the scan samples the rotation split dispersive flanks. Increasing the winding number broadens the central absorption and steepens accessible phase gradients, further boosting the attainable shift. The protocol remains minimally invasive under experimentally realistic conditions, and interatomic interactions have a negligible influence on the transmission features that set the phase slope. These results identify circulation, control power, and cavity detuning as practical knobs for in situ control of the Goos Hanchen shift, enabling interferometric beam steering and phase gradient metrology in hybrid atom optomechanical platforms.

cond-mat.quant-gas↗

arXiv2025

Normal Mode Splitting and Force Sensing in Cavity Magnomechanical System

In this study, we investigate the dynamics of system composed of a single cavity consisting of an optical parametric amplifier (OPA) and a YIG sphere influenced by a bias magnetic field. This bias field leads to magnetostrictive effects on magnon modes that induces phonons. We investigate the position fluctuation spectrum and the output field spectrum, finding that at G =0, the system displays a single peak, indicative of weak coupling between the optical and phononic modes. As G increases (e.g., G =0.1 kappa_a, 0.2 kappa_a, 0.4 kappa_a, we observe a transition to double peak, which reflects stronger coupling in the vicinity of cavity along with phonon modes that leads to normal mode splitting (NMS) in cavity magnomechanic system. Furthermore, we examine that the OPA amplifies the Y quadrature while squeezing the X quadrature of the output field spectrum. This sensitive behavior results in a more pronounced splitting in the Y quadrature spectra compared to the X quadrature. Our findings emphasize the essential role of the OPA in adjusting the interaction strength between the optical and phononic modes as well as underscore the importance of quadrature analysis in characterizing the system's response. NMS mechanism open avenues for advanced applications in quantum sensing and information processing, highlighting the potential for tunable devices in emerging quantum technologies.

physics.optics↗

arXiv2025

Magnetic Field induced control and Multiple Magnomechanically Induced Transparency in Single Cavity

We investigate magnomechanically induced transparency (MMIT) in a microwave 3D copper cavity with two YIG spheres under varying interaction parameters. Numerical simulations show that the steady-state magnon number increases with stronger coupling between cavity photons and magnons, and is sensitive to both bias and drive magnetic fields. Pronounced peaks in the magnon population near resonant fields highlight the importance of the bias field in energy transfer. The transparency windows are tunable, with up to quadruple windows depending on the coupling and magnon-phonon interactions, as seen in the transmission spectrum. Dispersion analysis reveals normal and anomalous regions, enabling slow and fast light propagation modulated by coupling strength. Phase and group delay variations, influenced by the drive field, further validate the tunability of transparency windows. This study demonstrates the potential of MMIT for precise control with out any additional non-linearity over light-matter interactions, with applications in quantum information processing and optical communications.

physics.optics↗

arXiv2025

Goos-Hanchen Shift and Slow Light Enhancement in a Fixed Cavity: Bose-Einstein Condensate Bogoliubov Modes as Mechanical Oscillators

In this study, we explore the dynamics of slow and fast light propagation in a system consisting of a Bose-Einstein condensate (BEC) acting as a mechanical oscillator coupled to an optical parametric amplifier (OPA) within a fixed-mirror cavity. The system's response is investigated through a comprehensive analysis of the transmission spectrum, output probe field characteristics (real and imaginary components), group delay, and Goos-Hänchen shift (GHS). Our findings reveal that variations in the effective coupling strength and the OPA gain have a profound impact on the system's behavior. Specifically, as the OPA gain increases, a Fano-like resonance emerges, enhancing the transparency window and altering the dispersion, which in turn influences the group delay. The GHS is shown to be sensitive to both the incident angle and the BEC-cavity coupling strength. These results offer valuable insights into the intricate interplay between the probe field, the mechanical oscillator, and the amplified modes of the OPA, highlighting the role of these interactions in shaping the propagation of light in such systems.

physics.optics↗