English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Optical forces can be chiral when they exhibit opposite signs for the twoenantiomeric versions of a chiral molecule or particle. Such forces could beeventually used to separate enantiomers, which could find application innumerous disciplines. Here, we analyze numerically the optical chiral forcesarising in the basic element of photonic integrated circuitry: a dielectricwaveguide with rectangular cross-section. Such waveguides are inherentlylossless thus generating chiral forces that are invariant in the longitudinaldirection and therefore enable enantiomeric separation over long (cm-scale)distances. Assuming Brownian motion in a liquid environment, we calculate firstthe force strength and time span needed to perform the separation of chiralnanoparticles as a function of the radii. Then we analyze the chiral forcesproduced by the fundamental quasi-TE guided mode in a silicon nitride waveguideand show that it can lead to enantiomeric separation via the transverse spin atshort wavelengths (405 nm). At longer wavelengths (1310 nm), the propercombination of degenerate quasi-TE and quasi-TM modes would result in aquasi-circularly polarized mode with intrinsic chirality (helicity), leading tochiral gradient forces that also enable the enantiomeric separation of smallernanoparticles. We report particle tracking simulations where the optical forcefield produced by a quasi-TE and a quasi-circular mode proved to separateenantiomers under a time span of two seconds. Our results suggest the viabilityof enantiomeric separation using simple photonic integrated circuits, thoughdifferent wavelength windows should be selected according to the nanoparticlesize.

Chiral forces in longitudinally invariant dielectric photonic waveguides