Search arXiv⌕ Search

arXiv · 1302.4877

Transverse relativistic effects in paraxial wave interference

Abstract

We consider relativistic deformations of interfering paraxial waves moving in the transverse direction. Owing to superluminal transverse phase velocities, noticeable deformations of the interference patterns arise when the waves move with respect to each other with non-relativistic velocities. Similar distortions also appear on a mutual tilt of the interfering waves, which causes a phase delay analogous to the relativistic time delay. We illustrate these observations by the interference between a vortex wave beam and a plane wave, which exhibits a pronounced deformation of the radial fringes into a fork-like pattern (relativistic Hall effect). Furthermore, we describe an additional relativistic motion of the interference fringes (a counter-rotation in the vortex case), which become noticeable at the same non-relativistic velocities.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Konstantin Y. Bliokh, Yana V. Izdebskaya, Franco Nori. 2013-03-30. Transverse relativistic effects in paraxial wave interference. https://doi.org/10.1088/2040-8978%2F15%2F4%2F044003

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

KEEP EXPLORING

Related papers

Efficient third-harmonic generation in high-Q tantalum pentoxide microcavities

Nonlinear harmonic generation in microcavities offers a compelling route toward energy efficient on-chip short-wavelength coherent light sources, enabled by tight optical confinement within compact mode volumes and flexible dispersion engineering. Tantalum pentoxide (Ta2O5) photonic platforms are particularly promising for realizing such nonlinear processes: their broad transparency window (280-8000 nm) supports broadband operation, their large bandgap suppresses two-photon absorption, and their thick-film deposition capability enables dispersion management--features that can collectively enhance the performance of nonlinear light sources. Here, we demonstrate, to the best of our knowledge, the first efficient third-harmonic generation (THG) in high-Q Ta2O5 microcavities. These microcavities feature smooth surfaces and high loaded Q factors up to 2.67X10^6, thereby facilitating nonlinear interactions. Through dispersion engineering, efficient THG is realized in both suspended microdisks and monolithic microrings under telecom-band continuous-wave laser pumping, as confirmed by optical spectra, visible-light microscopy, and the near-cubic pump-power dependence of the conversion efficiency. This work lays a foundation for chip-scale f-3f self-referencing of frequency combs and next-generation integrated nonlinear photonics.

physics.optics↗

Alignment-Free Optical Combining with Scalar-Message Expectation Propagation Detection for Distributed Multi-Aperture Coherent Reception

We propose an alignment-free distributed multi-aperture optical receiver with a single coherent front end, in which the differential delays between apertures are large. The branch signals are optically combined without inter-branch delay or phase alignment. Large differential delays produce separated tap clusters, forming a sparse ISI channel with long memory. Scalar-message expectation propagation exploits this sparsity to recover the transmitted symbols. Simulations show lower BER than equal-area single-aperture reception and no clear BER degradation over the tested delay spans. As the maximum differential delay increases from 100.5 to 200.5 symbol periods, the channel span nearly doubles, while the factor-graph edge count increases by only about 1.5\%. The trade-off is higher BER than ideal coherent combining schemes in exchange for fewer coherent front ends than digital combining and no inter-branch delay or phase alignment before optical combining.

physics.optics↗

Metasurface engineering of transient photothermal responses for vibrational imaging at living interfaces

Chemical transformations at biological interfaces are central to cellular function, yet the weak vibrational signals associated with subtle molecular changes limit their spatially resolved observation. Here, we present metasurface-driven mid-infrared photothermal imaging (MetaMIP), which uses resonantly engineered metasurfaces to amplify molecular temperature modulation while retaining rapid thermal recovery. Visible-light detection converts this response into submicrometre maps of individual nanoparticles and biological cells. In living cells, MetaMIP resolves spatially distinct chemical changes during enzymatic lipid conversion across the cell membrane. These results demonstrate the potential of engineered photothermal interfaces for mapping chemical composition and tracking its evolution during reactions.

physics.optics↗