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

A broad variety of light sources exhibit photon-count fluctuations thatdisplay inverse-square spectral behavior at extremely low frequencies. Thesesources include light-emitting diodes, superluminescent diodes, laser diodes,incandescent sources, and betaluminescent sources. In a series of experimentscarried out over an 18-month period, the photon-count fluctuations for thesesources were found to exhibit a $1/f^2$ spectral signature over the frequencyrange $1.0 \times 10^{-6} \le f \le 5.0 \times 10^{-4}$ Hz, corresponding to$33$ min $ \le T_f \le 11.6$ d, where $T_f \equiv 1/f$. The lower time limit isestablished by the photodetector noise floor while the upper time limit isdetermined by the duration of the individual experiments. Scalograms computedfrom our data are consistent with the periodograms. The universal character ofthis inverse-square baseband spectral behavior stands in sharp contrast to theoptical spectra of these sources, which differ markedly. Time traces of thephoton-count fluctuations are examined to shed light on the origin of thisenigmatic spectral behavior.

Photon-count fluctuations exhibit inverse-square baseband spectral behavior that extends to $< 1\;\mu$Hz