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

Sensing chirality is of fundamental importance to many fields, includinganalytical and biological chemistry, pharmacology, and fundamental physics.Recent developments have extended optical chiral sensing using microwaves, fspulses, superchiral light, and photoionization. The most widely used methodsare the traditional methods of circular dichroism and optical rotation (OR).However, chiral signals are typically very weak, and their measurement islimited by larger time-dependent backgrounds and by imperfect and slowsubtraction procedures. Here, we demonstrate a pulsed-laserbowtie-cavity-enhanced polarimeter with counter-propagating beams, which solvesthese background problems: the chiral signals are enhanced by the number ofcavity passes; the effects of linear birefringence are suppressed by a largeinduced intracavity Faraday rotation; and rapid signal reversals are effectedby reversing the Faraday rotation and subtracting signals from thecounter-propagating beams. These advantages allow measurements of absolutechiral signals in environments where background subtractions are not feasible:we measure optical rotation from chiral vapour in open air, and from chiralliquids in the evanescent wave (EW) produced by total internal reflection at aprism surface. EW-OR of (+)-maltodextrin and (-)-fructose solutions confirm theDrude-Condon model for Maxwell's equations in isotropic optically active media.In particular, the effective optical rotation path length, near index matching,is equal to the Goos-H\"anchen shift of the EW. The limits of this polarimeter,when using a continuous-wave laser locked to a stable high-finesse cavity,should match sensitivity measurements for linear birefringence ($3\times10^{-13}$ rad), which is several orders of magnitude more sensitive thancurrent chiral detection limits, transforming the power of chiral sensing inmany fields.

Evanescent-wave and open-air chiral sensing via signal-reversing cavity-enhanced polarimetry