Optical trap quality in extended 3-D structures built using holographic optical tweezers

2005 ◽  
Author(s):  
Gavin Sinclair ◽  
Miles Padgett ◽  
Z. J. Laczik
Keyword(s):  
Optical Tweezers ◽  
Optical Trap ◽  
Holographic Optical Tweezers

Measurement of Trap Stiffness of Holographic Optical Tweezers with Power Spectrum Method

2013 ◽  
Vol 787 ◽  
pp. 423-426
Author(s):  
Kai Xu ◽  
Jing Li ◽  
Gang Du ◽  
Chun Li Zhu ◽  
Peng Fei Li ◽  
...  
Keyword(s):  
Brownian Motion ◽  
Power Spectrum ◽  
Optical Tweezers ◽  
Laser Power ◽  
Optical Trap ◽  
Bottom Surface ◽  
Sample Cell ◽  
Spectrum Method ◽  
Holographic Optical Tweezers ◽  
Power Spectrum Method

A microsphere trapped by optical tweezers moves according to the Brownian motion law, which can be described by the Langevin equation. Based on it, a quadrant photodiode (QD) is used to track the displacement of the microsphere with a diameter of 2.5um trapped by holographic optical tweezers, and power spectrum method is adopted to obtain radial trap stiffness. Experiments show that the trap stiffness increases with the increase of the laser power, and decreases as the distance between the optical trap and the inside bottom surface of the sample cell increases.

scholarly journals Generation of Hybrid Optical Trap Array by Holographic Optical Tweezers

2021 ◽  
Vol 9 ◽  
Author(s):  
Xing Li ◽  
Yuan Zhou ◽  
Yanan Cai ◽  
Yanan Zhang ◽  
Shaohui Yan ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Optical Trap ◽  
Optical Traps ◽  
Axial Position ◽  
Spatial Light Modulators ◽  
Light Modulators ◽  
Multiple Particles ◽  
Holographic Optical Tweezers ◽  
Almost All ◽  
Gaussian Point

Enabled by multiple optical traps, holographic optical tweezers can manipulate multiple particles in parallel flexibly. Spatial light modulators are widely used in holographic optical tweezers, in which Gaussian point (GP) trap arrays or special mode optical trap arrays including optical vortex (OV) arrays, perfect vortex (PV) arrays, and Airy beam arrays, etc., can be generated by addressing various phase holograms. However, the optical traps in these arrays are almost all of the same type. Here, we propose a new method for generating a hybrid optical trap array (HOTA), where optical traps such as GPs, OVs, PVs, and Airy beams in the focal plane are combined arbitrarily. Also, the axial position and peak intensity of each them can be adjusted independently. The energy efficiency of this method is theoretically studied, while different micro-manipulations on multiple particles have been realized with the support of HOTA experimentally. The proposed method expands holographic optical tweezers’ capabilities and provides a new possibility of multi-functional optical micro-manipulation.

scholarly journals Positioning Accuracy in Holographic Optical Traps

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 559
Author(s):  
Frederic Català-Castro ◽  
Estela Martín-Badosa
Keyword(s):  
Optical Tweezers ◽  
Dynamic Control ◽  
Optical Trap ◽  
Optical Traps ◽  
Spatial Light Modulators ◽  
Positioning Accuracy ◽  
Light Modulators ◽  
Holographic Optical Tweezers ◽  
The One ◽  
Optically Trapped

Spatial light modulators (SLMs) have been widely used to achieve dynamic control of optical traps. Often, holographic optical tweezers have been presumed to provide nanometer or sub-nanometer positioning accuracy. It is known that some features concerning the digitalized structure of SLMs cause a loss in steering efficiency of the optical trap, but their effect on trap positioning accuracy has been scarcely analyzed. On the one hand, the SLM look-up-table, which we found to depend on laser power, produces positioning deviations when the trap is moved at the micron scale. On the other hand, phase quantization, which makes linear phase gratings become phase staircase profiles, leads to unexpected local errors in the steering angle. We have tracked optically trapped microspheres with sub-nanometer accuracy to study the effects on trap positioning, which can be as high as 2 nm in certain cases. We have also implemented a correction strategy that enabled the reduction of errors down to 0.3 nm.

scholarly journals Enhanced Signal-to-Noise and Fast Calibration of Optical Tweezers Using Single Trapping Events

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 570
Author(s):  
Alexander B. Stilgoe ◽  
Declan J. Armstrong ◽  
Halina Rubinsztein-Dunlop
Keyword(s):  
Brownian Motion ◽  
Optical Tweezers ◽  
Optical Trap ◽  
Force Transducer ◽  
Signal To Noise ◽  
Likelihood Estimator ◽  
Micro Fluidics ◽  
Large Numbers ◽  
Force Reconstruction ◽  
Micron Particle

The trap stiffness us the key property in using optical tweezers as a force transducer. Force reconstruction via maximum-likelihood-estimator analysis (FORMA) determines the optical trap stiffness based on estimation of the particle velocity from statistical trajectories. Using a modification of this technique, we determine the trap stiffness for a two micron particle within 2 ms to a precision of ∼10% using camera measurements at 10 kfps with the contribution of pixel noise to the signal being larger the level Brownian motion. This is done by observing a particle fall into an optical trap once at a high stiffness. This type of calibration is attractive, as it avoids the use of a nanopositioning stage, which makes it ideal for systems of large numbers of particles, e.g., micro-fluidics or active matter systems.

ORIENTATING MANIPULATION OF CYLINDRICAL PARTICLES WITH OPTICAL TWEEZERS

2008 ◽  
Vol 17 (04) ◽  
pp. 387-394 ◽  
Author(s):  
XIUDONG SUN ◽  
XUECONG LI ◽  
JIANLONG ZHANG
Keyword(s):  
Escherichia Coli ◽  
Carbon Nanotubes ◽  
Laser Beam ◽  
Optical Tweezers ◽  
Optical Trap ◽  
Polarization Direction ◽  
Beam Shape ◽  
E Coli ◽  
Potential Applications ◽  
Cylindrical Particles

Orientating manipulations of cylindrical particles were performed by optical tweezers. Vertical and horizontal manipulations of Escherichia coli (E. coli) were carried out by changing the trapping depth and the focused laser beam shape. It was found that carbon nanotubes bundles (CNTBs) could be rotated in the linear polarized optical trap until it orientated its long axis along the linear polarization direction of the laser beam. However, E.coli could not be orientated in this way. Corresponding mechanisms were discussed based on the anisomeric electric characters of CNTBs. These orientation technologies of cylindrical objects with optical trap have potential applications in assembling nano-electric devices.

Moving average process underlying the holographic–optical–tweezers experiments

2014 ◽  
Vol 53 (10) ◽  
pp. B254 ◽  
Author(s):  
Jakub Ślęzak ◽  
Sławomir Drobczyński ◽  
Karina Weron ◽  
Jan Masajada
Keyword(s):  
Optical Tweezers ◽  
Moving Average ◽  
Average Process ◽  
Moving Average Process ◽  
Holographic Optical Tweezers

scholarly journals Precise, contactless measurements of the surface tension of picolitre aerosol droplets

2016 ◽  
Vol 7 (1) ◽  
pp. 274-285 ◽  
Author(s):  
Bryan R. Bzdek ◽  
Rory M. Power ◽  
Stephen H. Simpson ◽  
Jonathan P. Reid ◽  
C. Patrick Royall
Keyword(s):  
Surface Tension ◽  
Optical Tweezers ◽  
Holographic Optical Tweezers ◽  
Contactless Measurements

Precise measurements of the surface tension and viscosity of airborne picolitre droplets can be accomplished using holographic optical tweezers.

Aberration correction in holographic optical tweezers using a high-order optical vortex: publisher’s note

2018 ◽  
Vol 57 (17) ◽  
pp. 4857
Author(s):  
Yansheng Liang ◽  
Yanan Cai ◽  
Zhaojun Wang ◽  
Ming Lei ◽  
Zhiliang Cao ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Optical Vortex ◽  
High Order ◽  
Aberration Correction ◽  
Holographic Optical Tweezers

Wavefront engineering and holographic optical tweezers

2015 ◽  
pp. 319-344
Author(s):  
Philip Jones ◽  
Onofrio Marago ◽  
Giovanni Volpe
Keyword(s):  
Optical Tweezers ◽  
Holographic Optical Tweezers
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