Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · 1502.04454

Axial dependence of optical weak measurements in the critical region

Manoel P. Araujo·Stefano De Leo·Gabriel G. Maia
View original source ↗Read source document ↗Export metadata ↓

Abstract

The interference between optical beams of different polarizations plays a fundamental role in reproducing the optical analog of the electron spin weak measurement. The extraordinary point in optical weak measurements is represented by the possibility to estimate with great accuracy the Goos-Haenchen (GH) shift by measuring the distance between the peak of the outgoing beams for two opposite rotation angles of the polarizers located before and after the dielectric block. Starting from the numerical calculation of the GH shift, which clearly shows a frequency crossover for incidence near to the critical angle, we present a detailed study of the interference between s and p polarized waves in the critical region. This allows to determine in which conditions it is possible to avoid axial deformations and reproduce the GH curves. In view of a possible experimental implementation, we give the expected weak measurement curves for Gaussian lasers of different beam waist sizes propagating through borosilicate (BK7) and fused silica dielectric blocks.

Explore related subjects

physics.opticsquant-ph

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Manoel P. Araujo, Stefano De Leo, Gabriel G. Maia. 2015-02-16. Axial dependence of optical weak measurements in the critical region. https://doi.org/10.1088/2040-8978%2F17%2F3%2F035608

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Long-Term $10^{-18}$-Level Flexible Stability Transfer with a Hybrid-Locked Kerr Microcomb

Optical atomic clocks are moving toward deployable systems, with commercial instruments entering the $10^{-17}$ fractional-frequency-instability regime. Transferring this performance to accessible microwave and radio-frequency signals requires compact optical frequency combs that preserve long-term stability during frequency division. Integrated Kerr microcombs have opened a new era in chip-scale precision metrology, enabling optical-frequency division and low-noise microwave generation. Yet, whether they can robustly preserve the stability required by state-of-the-art optical lattice and single-ion clocks over hour-long timescales remains an open question. Here we demonstrate that a hybrid passive-active stabilization of a Kerr microcomb, combining injection-locking of one tooth with active stabilization of a second, freely selected tooth through pump-frequency actuation, can indeed satisfy the metrological requirements at the highest level. The separated control channels effectively orthogonalize stabilization of the two microcomb frequency degrees of freedom while leaving the pump frequency unconstrained. A continuous five-hour measurement, without drift removal, yields a residual relative instability of $1.4\times10^{-16}$ at 1 s and $2\times10^{-18}$ at 4000 s on an out-of-loop tooth. We further show that the residual instability remains unchanged as the injection power is varied over 14 dB, demonstrating robust operation across a broad locking range. These results bring integrated microcomb stabilization into the residual-noise regime required to preserve the long-term performance of emerging optical lattice and single-ion clock systems.

physics.optics↗
arXiv2026

Momentum-space non-Hermitian skin effect in an exciton-polariton system

Localization of a macroscopic number of eigenstates on a real-space boundary, known as the non-Hermitian skin effect, is one of the striking topological features emerging from non-Hermiticity. Realizing this effect typically requires periodic (lattice) systems with asymmetry of intersite coupling, which is not readily available in many physical platforms. Instead, it is meticulously engineered, e.g., in photonics, which results in complex structures requiring precise fabrication steps. Here, we propose a simpler mechanism: introducing an asymmetric, purely imaginary potential in a topologically trivial system induces momentum-space localization akin to the skin effect. We experimentally demonstrate this localization using exciton polaritons, hybrid light-matter quasi-particles in a simple engineered `round box' trap, pumped by a laser pump offset from the trap center. The effect disappears if the pump is concentric with the trap. The localization persists and becomes stronger at higher densities of polaritons, when a non-equilibrium Bose-Einstein condensate is formed and the system becomes nonlinear. Our approach offers a new route to realizing skin effects in continuous, non-periodic systems and exploring the interplay of non-Hermiticity, topology, and nonlinearity in macroscopic quantum states.

physics.optics↗
arXiv2026

Highly-efficient perturbative Raman shifting by engineering the nonlinear temporal response

Raman scattering underlies a broad range of spectroscopic and light-generation techniques, yet its conventional description, based on the Raman gain spectrum, accurately describes only long-pulse, steady-state dynamics. We employ a time-domain theoretical approach to account for spectrotemporal aspects of continuous frequency-shifting, which are not addressed by prior theories. In particular, molecules with strong Raman responses do not produce an efficient soliton self-frequency shift in gas-filled hollow-core fibers. The time-domain analysis exposes temporal and spectral distortions from the Raman response that impact frequency-shifting detrimentally, and identifies how these distortions can be suppressed by reducing the Raman interaction to a perturbation on the electronic response. Experiments that employ gas mixtures with tunable Raman fractions of the nonlinear response demonstrate up to a four-fold increase in quantum efficiency (from 20 to 80%) compared to the pure molecular gas, and unity-efficiency Raman shifting will be possible. The time-domain framework uncovers phenomena that are inaccessible through the frequency-domain treatment of Raman scattering, and it applies to Raman interactions in solids, liquids, and gases across Raman temporal regimes.

physics.optics↗