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We experimentally demonstrate optical trapping with micro-ring resonators. Tuning the incident wavelength enables controlled trapping and release of particles. The resonance frequency red-shift upon trapping enables monitoring of the particle physical properties.
Resonant silicon photonics has recently enabled the direct optical tweezing of nano-objects on chip. Here we present a comprehensive evaluation of different resonator designs and demonstrate one with a stiffness of 22.3 pN nm−1 W−1.
We investigate the use of optical trap assisted nanopatterning for creating nanoscale features on surfaces with pre-existing topography. Uniform patterns over silicon and polyimide surfaces with several micrometer deep grooves are demonstrated.
Double optical tweezers is suggested for studying red blood cell aggregation. Quantitative measurements of interaction forces between a pair of RBC are performed. Comparative analysis of aggregation for healthy and pathological blood samples is shown.
Preliminary results for gradient forces on optical tweezers, using double-negative (DNG) particles, are presented adopting full electromagnetic theory for focused Gaussian beams, revealing unusual and interesting behaviors that could be exploited in biomedical optics research.
We have combined optical trapping and fluorescence correlation spectroscopy (FCS) to determine the trapping energy and concentration of nanoparticles in suspension by analyzing the elongated dwell time and enhanced concentration in the optical trap.
We model and examine advantages and limitations of diode laser bar trapping for manipulating particles greater than 100 µm in diameter. This method overcomes limitations that prevent conventional point traps from effectively directing large particles.
We demonstrated trapping of 6-μm polystyrene microparticles over a 253-μm range using a trapping power of ~ 7 mW at 1550 nm. The observed particle levitation and segregation offer a longe-range energy-efficient manipulation mechanism.
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