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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Spontaneous emission from excitonic transitions in InAs/GaAs quantum dotsembedded in photonic crystal waveguides at 5K into non-guided and guided modesis determined by direct hyperspectral imaging. This enables measurement of theabsolute coupling efficiency into the guided modes, the beta-factor, directly,without assumptions on decay rates used previously. Notably, we foundbeta-factors above 90% over a wide spectral range of 40meV in the fast lightregime, reaching a maximum of (99 $\pm$ 1)%. We measure the directionalemission of the circularly polarized transitions in a magnetic field intocounter-propagating guided modes, to deduce the mode circularity at the quantumdot sites. We find that points of high directionality, up to 97%, correlatewith a reduced beta-factor, consistent with their positions away from the modefield antinode. By comparison with calibrated finite-difference time-domainsimulations, we use the emission energy, mode circularity and beta-factor toestimate the quantum dot position inside the photonic crystal waveguide unitcell.

99% beta factor and directional coupling of quantum dots to fast light in photonic crystal waveguides determined by hyperspectral imaging