Combining weighting and scatterometry: Application to a levitated droplet of suspension

Optical diagnostics of a single evaporating droplet using fast parallel computing on graphics processing units

“…Further details of our experimen− tal setup and procedures can be found in Ref. 19 and in refer− ences given therein.…”

“…In this way we find the temporal evolution of the droplet radius versus time a(t) (see e.g. [19][20][21]). It is worth noticing that inversion of a single scattering pattern is not a challenge from computational point of view.…”

Collective Scattering of Light on Gold Nanospheres Dispersed in Diethylene Glycol Microdroplet

“…The studied droplets of suspension were singly levitated in an electrodynamic quadrupole trap [13][14][15][16] built in our laboratory [8,17,18]. A proper combination of alternating (AC) and static (DC) electric fields, in (nearly) quadrupolar configuration, enables constraining a charged particle to a very small volume, in practice to a point.…”

“…The droplet radius evolution R(t) was determined by analyzing (mostly with the look-up table method in the framework of the Mie theory [21]) the scatterograms sequence (I V V (Θ, t) and I HH (Θ, t)) and by weighting with the help of the DC field of the trap [18]. The combination of these methods yields R(t) very accurately for a wide range of suspension concentrations.…”

“…3), and compared the temporal evolution of WGMs with the spatial distribution evolution of scattered light -in particular with the interference fringes manifestation (typical for scattering on uniform droplet, see e.g. [18]). The interference fringes are visible as vertical white dashed lines in I V V (Θ, t) map in Fig.…”