TRAPPING OF GOLD NANOPARTICLE AND POLYSTYRENE BEADS BY DYNAMIC OPTICAL TWEEZERS

2015 ◽  
Vol 74 (8) ◽  
Author(s):  
M. S. Aziz ◽  
K. Tufail ◽  
N. E. Khamsan ◽  
S. Affandi ◽  
S. Daud ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Dark Soliton ◽  
Input Power ◽  
Optical Force ◽  
Gradient Force ◽  
Polystyrene Beads ◽  
Multiple Trapping ◽  
Different Diameters ◽  
20 Nm ◽  
Good Agreement

Gold nanoparticles and polystyrene beads are very important to use in advanced nanoscopic optical trapping techniques to probe any biological system of interest. Multiple trapping of these particles with different diameters can be performed by an optical tweezers system employing dark soliton controlled by Gaussian pulse within a particular configuration of microring resonators. By controlling some parameters and input power of the system, dynamics of the tweezers can be tuned. Radiation pressure acting on the particles including gradient and scattering forces were theoretically measured as a function of normalized position from the center of the laser beam. In this work, the highest output signal in the form of potential well is recorded at 112.80 W corresponding to 1.6 mm wavelength. Sizes of the tweezers are found within the range of 20 nm and the highest value of the optical force is recorded at 895.70 pN. We have demonstrated that the gradient force component is dominant over particle size within Rayleigh regime, thus a good agreement with theory is found.

Optical tweezers as a tool to study cellular function

1992 ◽  
Vol 50 (1) ◽  
pp. 424-425
Author(s):  
Steven M. Block
Keyword(s):  
Optical Tweezers ◽  
Optical Trap ◽  
Three Dimensional ◽  
Characteristic Size ◽  
Gradient Force ◽  
Single Beam ◽  
Temporal Precision ◽  
Dielectric Particles ◽  
Ligand Interactions ◽  
20 Nm

A single beam gradient force optical trap1-3, or “optical tweezers”, exerts forces on microscopic dielectric particles using a highly focused beam of laser light, and can achieve stable, three-dimensional trapping of such particles (for a review, see ref. 4). Using an infrared laser, calibratable forces in the piconewton (pN) range can be easily generated without causing significant damage to living biological specimens. Optical tweezers work through the microscope, without mechanical intrusion within sealed preparations, and can even reach directly inside transparent cells or organelles. Because it is formed by light, an optical trap can be controlled with very high spatial and temporal precision. Its characteristic size (i.e., its “grasp”) is approximately equal to the wavelength of light, but it can be used to capture and/or manipulate objects ranging in size from ∼20 nm to ∼100 mm. Biological preparations (e.g., cells, vesicles, organelles) or small particles (e.g., latex or silica microspheres, perhaps carrying reagents coupled to their surfaces) can be held, maneuvered, or released at will. Already, researchers have begun to contemplate experiments that were practically impossible just a few years ago. Some possibilities include: (1) the sorting and isolation of cells, vesicles, organelles, chromosomes, etc.; (2) the direct measurement of the mechanical properties of cytoskeletal assemblies, membranes, or membrane-bound elements; (3) measurement of the tiny forces produced by mechanoenzymes; (4) establishing cell-cell contacts, or measuring receptor-ligand interactions; (5) studying cellular rheology on the micrometer scale; (6) doing cellular microsurgery, membrane fusion, and building novel cellular (or noncellular) structures; (7) capturing and maintaining fragile biological structures away from vessel surfaces, in order to study them in isolation under optimal viewing conditions; (8) and much more! The principles by which optical tweezers work will be explained, and a videotape illustrating a number of experimental uses will be shown.

scholarly journals Acoustic Tweezers for Particle and Fluid Micromanipulation

2020 ◽  
Vol 52 (1) ◽  
pp. 205-234 ◽  
Author(s):  
M. Baudoin ◽  
J.-L. Thomas
Keyword(s):  
Optical Tweezers ◽  
Acoustic Radiation ◽  
Wide Spectrum ◽  
Acoustic Streaming ◽  
Input Power ◽  
Three Dimensions ◽  
Particle Sizes ◽  
Future Directions ◽  
Acoustic Radiation Pressure ◽  
Acoustic Tweezers

Acoustic tweezers powerfully enable the contactless collective or selective manipulation of microscopic objects. Trapping is achieved without pretagging, with forces several orders of magnitude larger than optical tweezers at the same input power, limiting spurious heating and enabling damage-free displacement and orientation of biological samples. In addition, the availability of acoustical coherent sources from kilo- to gigahertz frequencies enables the manipulation of a wide spectrum of particle sizes. After an introduction of the key physical concepts behind fluid and particle manipulation with acoustic radiation pressure and acoustic streaming, we highlight the emergence of specific wave fields, called acoustical vortices, as a means to manipulate particles selectively and in three dimensions with one-sided tweezers. These acoustic vortices can also be used to generate hydrodynamic vortices whose topology is controlled by the topology of the wave. We conclude with an outlook on the field's future directions.

Analysis of Piezoelectric Power Harvesting with Composite Energy Converter in Thermal Environments

2010 ◽  
Vol 139-141 ◽  
pp. 2340-2345
Author(s):  
Sheng Wen ◽  
Tie Min Zhang ◽  
Xiu Li Yang
Keyword(s):  
Excitation Frequency ◽  
Electrical Energy ◽  
Induced Voltage ◽  
Energy Converter ◽  
Power Harvesting ◽  
Thermal Environments ◽  
Piezoelectric Energy ◽  
Different Diameters ◽  
Composite Energy ◽  
Good Agreement

A composite piezoelectric energy converter intended for Micro-electromechanical Systems (MEMS) from background vibrations is presented. The converter is composed of a piezoelectric circular plate bonded to a brass substrate with different diameters. The vibration of the structure is analyzed based on the thermal-piezoelectric-elastic theory and Kirchhoff’s assumption. The vibration solutions and the relation between the vibration and output charge are obtained. The effects of geometric characteristics and environment temperatures on the electrical energy generation are numerically discussed. The numerical results show that the vibration-induced voltage is proportional to the excitation frequency and the thickness of the device, but is inversely proportional to the temperature of the environment. The experimental data show good agreement with the energy conversion analytical model.

Wafer Bonding for Soi

1987 ◽  
Vol 107 ◽  
Author(s):  
W.P. Maszara ◽  
G. Goetz ◽  
T. Caviglia ◽  
A. Cserhati ◽  
G. Johnson ◽  
...  
Keyword(s):  
Surface Energy ◽  
Room Temperature ◽  
Bonding Temperature ◽  
Silicon Layer ◽  
Inert Atmosphere ◽  
Mos Capacitors ◽  
Face To Face ◽  
Interface Charge ◽  
20 Nm ◽  
Good Agreement

AbstractBonding of 3 and 4 in. oxidized silicon wafers was investigated for SOI applications. The bonding was achieved by using a surface treatment procedure compatible with VLSI processing and by heating in an inert atmosphere a pair of wafers which had been contacted face-to-face. A quantitative method for the evaluation of the surface energy of the bond based on crack propagation was developed. The bond strength was found to increase with the bonding temperature from about 60-85 erg/cm2 at room temperature to ⋍2200 erg/cm2 at 1405°C, in good agreement with the surface energy of bulk quartz. The strength was essentially independent of the bond time for up to 1100°C. Electrical properties of the wet-oxide-to-wet-oxide bond were tested using MOS capacitors. The results were consistent with a negative interface charge density of approximately 1011cm−2 at the bond. A double etch-back procedure was used to thin the device wafer to the desired thickness within *20 nm across a 3in. wafer. The density of threading dislocations in the remaining silicon layer was smaller than 103 cm−3, and the residual dopant concentration less than 5×l015cm−3, both remnants of the etchstop layer. A discussion of the bonding mechanism will be presented.

Deformation Behavior of Doubly Curved SS400 Thick Metal Plates by High Frequency Induction-Based Line Heating

2013 ◽  
Vol 535-536 ◽  
pp. 369-372 ◽  
Author(s):  
Kwang Seok Lee
Keyword(s):  
Numerical Analysis ◽  
Deformation Behavior ◽  
Thick Plate ◽  
Input Power ◽  
Line Heating ◽  
Metal Plates ◽  
Thermomechanical Deformation ◽  
Drastic Increase ◽  
Doubly Curved ◽  
Good Agreement

Line heating-induced deformation behavior of an SS400 thick plate was investigated through both numerical analysis and experimental counterpart by applying induction heating (IH) as a heat source. The drastic increase of temperature gradient upon increasing input power could mainly be predicted by numerical analysis, which attributes to the amount of permanent bending deformation of the thick plate. After plotting the amount of vertical deformation as a function of various positions from top surface of the plate, we found that the higher input power, the more thermomechanical deformation can be generated, regardless of the purposed doubly curved shapes such as concave and saddle-type plates. Also there is good agreement between the numerical analysis and experimental measurement in terms of the transverse curvature.

NOVEL OPTICAL TRAPPING TOOL GENERATION AND STORAGE CONTROLLED BY LIGHT

2010 ◽  
Vol 19 (02) ◽  
pp. 371-378 ◽  
Author(s):  
P. YOUPLAO ◽  
T. PHATTARAWORAMET ◽  
S. MITATHA ◽  
C. TEEKA ◽  
P. P. YUPAPIN
Keyword(s):  
Optical Tweezers ◽  
Optical Trapping ◽  
Optical Filter ◽  
Optical Tweezer ◽  
Dark Soliton ◽  
Optical Probe ◽  
Bright Soliton ◽  
Design System ◽  
Soliton Pulse ◽  
And Storage

We propose a novel system of an optical trapping tool using a dark-bright soliton pulse-propagating within an add/drop optical filter. The multiplexing signals with different wavelengths of the dark soliton are controlled and amplified within the system. The dynamic behavior of dark bright soliton interaction is analyzed and described. The storage signal is controlled and tuned to be an optical probe which can be configured as the optical tweezer. The optical tweezer storage is embedded within the add/drop optical filter system. By using some suitable parameters, we found that the tweezers storage time of 1.2 ns is achieved. Therefore, the generated optical tweezers can be stored and amplified within the design system. In application, the optical tweezers can be stored and trapped light/atom, which can be transmitted and recovered by using the proposed system.

Optical Tweezers: A Practical Guide

1995 ◽  
Vol 1 (2) ◽  
pp. 65-74
Author(s):  
Scot C. Kuo
Keyword(s):  
Optical Tweezers ◽  
Optical Microscope ◽  
Gradient Force ◽  
Biological Applications ◽  
Single Beam ◽  
Practical Guide ◽  
Microscopy Techniques ◽  
Displacement Measurements

Optical tweezers, or the single-beam optical gradient force trap, is becoming a major tool in biology for noninvasive micromanipulation on an optical microscope. The principles and practical aspects that influence construction are presented in an introductory primer. Quantitative theories are also reviewed but have yet to supplant user calibration. Various biological applications are summarized, including recent quantitative force and displacement measurements. Finally, tantalizing developments for new, nonimaging microscopy techniques based on optical tweezers are included.

Using the Superficial Resonant Peak and PCA for Determining the Gold Nanoparticle Diameter

2013 ◽  
Vol 818 ◽  
pp. 111-116
Author(s):  
Juan Carlos Martínez-Espinosa ◽  
Teodoro Cordova-Fraga ◽  
Aldelmo Reyes-Pablo ◽  
Miguel Vargas-Luna
Keyword(s):  
Principal Component Analysis ◽  
Gold Nanoparticles ◽  
Colloidal Suspension ◽  
Principal Component ◽  
Resonant Peak ◽  
Gold Colloid ◽  
Colloid Nanoparticles ◽  
Different Diameters ◽  
20 Nm

A model resulting from principal component analysis and assessment based on surface resonant peak of UV-VIS spectrum to determine the diameter of gold nanoparticles is presented in this paper. Six different diameters were analyzed by using the absorption spectra in the range from 400 nm to 700 nm. Commercial TED-PELLA gold colloid nanoparticles with diameters between 20 nm and 80 nm were measured. Preliminary results suggest the usefulness that this model may have on the characterization of nanostructured materials in colloidal suspension, as well as its application in manufacturing protocols standardization of nanoparticles.

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