We consider the optical dipole potential energy, which arises from interaction of a two-level atom with circularly polarized Laguerre-Gaussian laser beam small waist. The is characterized by existence longitudinal electric field component responsible for appearance chiral term in energy. This reverses sign if either winding number or wave polarization sign. propose scheme bi-chromatic vortex re...

Abstract Optical activity is conventionally understood as a natural difference in the optical responses of chiral materials with opposite handedness. It stems from quantised spin angular momentum ± ħ per photon, representing either left- or right-handed circular polarisations. Less well known, until recently, was possibility that matter might also respond similar, discriminatory way to handedne...

Helicity $H$, chirality $C$, and spin angular momentum $\mathbf{S}$ are three physical observables that play an important role in the study of optical fields. These quantities closely related, but their connection is hidden by use four different vector fields for representation, namely, electric magnetic $\mathbf{E}$ $\mathbf{B}$, two transverse potential vectors $\mathbf{C}^\perp$ $\mathbf{A}^...

Circularly polarized light is utilized in various optical techniques and devices. However, using conventional optical systems to generate, analyse and detect circularly polarized light involves multiple optical elements, making it challenging to realize miniature and integrated devices. While a number of ultracompact optical elements for manipulating circularly polarized light have recently bee...

We applied a methodology capable of resolving the optical rotatory power into atomic contributions. The individual atomic contributions to the optical rotatory power and molecular chirality of the methylhydroperoxide are obtained via a canonical transformation of the Hamiltonian by which the electric dipolar moment operator is transformed to the acceleration gauge formalism and the magnetic dip...

Optical microcavities with whispering-gallery modes (WGMs) have been indispensable in both photonic researches and applications. Besides, metasurfaces, have attracted much attention recently due to their strong abilities to manipulate electromagnetic waves. Here, combining these two optical elements together, we show a tubular cavity can convert input propagating cylindrical waves into directed...

Light interacts differently with left and right handed three dimensional chiral objects, like helices, and this leads to the phenomenon known as optical activity. Here, by applying a polarization tomography, we show experimentally, for the first time in the visible domain, that chirality has a different optical manifestation for twisted planar nanostructured metallic objects acting as isolated ...

Chirality plays a vital role in biological membranes and has a significant effect depending on the type and arrangement of the isomer. Menthol has two typical chiral forms, d- and l-, which exhibit different behaviours. l-Menthol is known for its physiological effect on sensitivity (i.e. a cooling effect), whereas d-menthol causes skin irritation. Menthol molecules may affect not only the therm...

Manipulating the morphology of inorganic nanostructures, such as their chirality and branching structure, has been actively pursued as a means of controlling their electrical, optical and mechanical properties. Notable examples of chiral inorganic nanostructures include carbon nanotubes, gold multishell nanowires, mesoporous nanowires and helical nanowires. Branched nanostructures have also bee...