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

We demonstrate the measurement of mass of the absorbing micro-particletrapped in air by optical forced oscillation. When the trapping light intensityis modulated sinusoidally, the particle in the trap undergoes forcedoscillation and the amplitude of the oscillation depends directly on themodulated frequency. Based on a simple spring model, we fit the amplitudesversus the modulated frequencies and obtain the stiffness of the optical trapand the mass of the trapped particle. The fitting results show that, for acertain particle, the stiffness varies linearly with the trapping lightintensity while the mass is consistent. The density of the micro-particle isthen estimated and could be used to classify different kinds of absorbingparticles, like C and CuO.

Measurement of mass by optical forced oscillation of absorbing particles trapped in air