2 research outputs found
Three-dimensional enantiomeric recognition of optically trapped single chiral nanoparticles
We optically trap freestanding single metallic chiral nanoparticles using a
standing-wave optical tweezer. We also incorporate within the trap a
polarimetric setup that allows to perform in situ chiral recognition of single
enantiomers. This is done by measuring the S_3 component of the Stokes vector
of a light beam scattered off the trapped nanoparticle in the forward
direction. This unique combination of optical trapping and chiral recognition,
all implemented within a single setup, opens new perspectives towards the
control, recognition, and manipulation of chiral objects at nanometer scales.Comment: 8 pages, including Supplemental Material, 7 figure
Optimal protocols and universal time-energy bound in Brownian thermodynamics
We propose an optimization strategy to control the dynamics of a stochastic
system transferred from one thermal equilibrium to another and apply it
experimentally to a Brownian particle in an optical trap under compression.
Based on a variational principle that treats the transfer duration and the
expended work on an equal footing, our strategy leads to a family of protocols
that are either optimally cheap for a given duration or optimally fast for a
given energetic cost. This approach unveils a universal relation between the transfer duration
and the expended work. We verify experimentally that the lower bound is reached
only with the optimized protocols.Comment: 10 pages, 14 figure