scholarly journals Axial Calibration of QPD Signal based on Stuck Bead Method for Optical Trapping Applications

2018 ◽  
Vol 7 (4.30) ◽  
pp. 371
Author(s):  
Mohd Farid Mohamad Yusof ◽  
, Muhamad Safuan Mat Yeng ◽  
Shahrul Kadri Ayop
Keyword(s):  
Optical Trapping ◽  
Optical Tweezer ◽  
Propagation Direction ◽  
Intensity Profile ◽  
Mechanical Parameter ◽  
Glass Coverslip ◽  
Laser Propagation ◽  
Laser Focus ◽  
Bead Method ◽  
Quadrant Photodetector

Calibration of axial quadrant photodetector (QPD) signal to the trapped bead position in an optical tweezer is important to measure the quantitative mechanical parameter in axial (laser propagation) direction. An alternative calibration based on the Stuck Bead Method (SBM) was proposed in this study. 3 µm polystyrene beads were stuck at the surface of glass coverslip and moved axially around the laser focus. QPD was used to obtain the position dependent intensity profile at three different laser powers (19.8 mW, 34.1 mW, 48.5 mW). The QPD signal-to-distance calibration value was consistent at 26 mV/µm for the used bead at the three laser powers. It was found that the calibration values are independent of laser powers and limited by the resolution of distance adjustment.

Wavefront Sensorless Aberration Correction With Magnetic Fluid Deformable Mirror for Laser Focus Control in Optical Tweezer System

2021 ◽  
Vol 57 (1) ◽  
pp. 1-6
Author(s):  
Zhizheng Wu ◽  
Tianyu Zhang ◽  
Dziki Mbemba ◽  
Yuanyuan Wang ◽  
Xiang Wei ◽  
...  
Keyword(s):  
Magnetic Fluid ◽  
Optical Tweezer ◽  
Deformable Mirror ◽  
Aberration Correction ◽  
Laser Focus

THE POTENTIAL OF OPTICAL TWEEZER (OT) FOR VISCOELASTIVITY MEASUREMENT OF NANOCELLULOSE SOLUTION

2015 ◽  
Vol 74 (8) ◽  
Author(s):  
Wan Nor Suhaila Wan Aziz ◽  
Shahrul Kadri Ayop ◽  
Sugeng Riyanto
Keyword(s):  
Conventional Method ◽  
Optical Trapping ◽  
Optical Tweezer ◽  
The Public ◽  
Polymeric Solution ◽  
Trapping Method

In this paper, we review the recent applications of optical tweezer (OT) in studying the microrheology of variety of polymeric solution. Our aim is to expose optical tweezer research to the public and newcomer. This paper highlights and summarizes the advantages of optical tweezer as compared with the conventional method, introduces the benefit of nanocellulose and also presents an overview of the potential in the measurement of nanocellulose solution’s viscoelasticity by using optical trapping method.

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.

scholarly journals Dynamics of laser induced micro-shock waves and hot core plasma in quiescent air

2013 ◽  
Vol 31 (2) ◽  
pp. 263-272 ◽  
Author(s):  
Ch. Leela ◽  
Suman Bagchi ◽  
V. Rakesh Kumar ◽  
Surya P. Tewari ◽  
P. Prem Kiran
Keyword(s):  
Bubble Dynamics ◽  
Second Harmonic ◽  
Maximum Velocity ◽  
Ambient Air ◽  
Propagation Direction ◽  
Iccd Camera ◽  
Time Resolved ◽  
Laser Propagation ◽  
Core Plasma ◽  
Spatio Temporal

AbstractWe present our results on spatio-temporal evolution of laser plasma produced shockwaves (SWs) and hot core plasma (HCP) created by focused second harmonic (532 nm, 7 ns) of Nd-YAG laser in quiescent atmospheric air at f/#10 focusing geometry. Time resolved shadowgraphs imaged with the help of an ICCD camera with 1.5 ns temporal resolution revealed the presence of two co-existing sources simultaneously generating SWs. Each of the two sources independently led to a spherical SW following Sedov-Taylor theory along the laser propagation direction with a maximum velocity of 7.4 km/s and pressure of 57 MPa. While the interaction of SWs from the two sources led to a planar SW in the direction normal to the laser propagation direction. The SW detaches from the HCP and starts expanding into the ambient air at around 3 µs indicating the onset of asymmetric expansion of the HCP along the z-axis. The asymmetric expansion is observed till 10 µs beyond which the SW leaves the field of view followed by a deformation of the irradiated region in the XY-plane due to the penetration of surrounding colder air in to the HCP. The deformation in the XY-plane lasts till 600 µs. The dynamics of rapidly expanding HCP is observed to be analogous to that of cavitation bubble dynamics in fluids.

Elastic theory for the deformation of a spherical dielectric biological object under electro-optical trapping

RSC Advances ◽  
2015 ◽  
Vol 5 (55) ◽  
pp. 44458-44462 ◽  
Author(s):  
Md. Mozzammel Haque
Keyword(s):  
Shear Modulus ◽  
Spherical Particle ◽  
Biological Object ◽  
Optical Trapping ◽  
Optical Tweezer ◽  
Elastic Theory ◽  
Single Beam

The shear modulus of a dielectric spherical particle is investigated using a combination of triangular (or square) electrodes and a single-beam optical tweezer.

scholarly journals Errors of Airborne Bathymetry LiDAR Detection Caused by Ocean Waves and Dimension-Based Laser Incidence Correction

2021 ◽  
Vol 13 (9) ◽  
pp. 1750
Author(s):  
Kai Guo ◽  
Qingquan Li ◽  
Qingzhou Mao ◽  
Chisheng Wang ◽  
Jiasong Zhu ◽  
...  
Keyword(s):  
Surface Waves ◽  
Water Surface ◽  
Surface Wind ◽  
Measurement Data ◽  
Ocean Surface ◽  
Ocean Waves ◽  
Propagation Direction ◽  
Propagation Model ◽  
Actual Measurement ◽  
Laser Propagation

Ocean waves are a vital environmental factor that affects the accuracy of airborne laser bathymetry (ALB) systems. As the regional water surface undulates with randomness, the laser propagation direction through the air–water surface will change and impact the underwater topographic result from the ALB system, especially for the small laser divergence system. However, the natural ocean surface changes rapidly over time, and uneven ocean surface point clouds from ALB scanning will cause an uncertain estimation of the laser propagation direction; therefore, a self-adaptive correction method based on the characteristics of the partial wave surface is key to improving the accuracy and applicability of the ALB system. In this paper, we focused on the issues of spatial position deviation caused by surface waves and position correction of the underwater laser footprint, and the dimension-based adaptive method is applied to attempt to correct the laser incidence angle. Simulation experiments and analysis of the actual measurement data from different ALB systems verified that the method can effectively suppress the influence of ocean waves. Furthermore, the inversion result of sea surface inclination changes is consistent with the surface wind wave reanalysis products. Based on the laser underwater propagation model in the strategy, we also quantitatively analyzed the influence of surface waves on laser bathymetry, which can guide the operation selection and data processing of the ALB system at specific water depths and under dynamic ocean conditions.

Using Collins Formula with Scaling Factor to Analysis the Propagation Properties in Laser Focus System Design

2016 ◽  
Vol 679 ◽  
pp. 185-190
Author(s):  
Long Shi ◽  
Yu Xing Dong ◽  
Ming Lv ◽  
Ru Hai Guo
Keyword(s):  
System Design ◽  
Optical System ◽  
Angular Spectrum ◽  
Tolerance Analysis ◽  
Scaling Factor ◽  
Optical Systems ◽  
Experimental Result ◽  
Laser Propagation ◽  
Laser Focus ◽  
Angular Spectrum Method

A Collins formula method with a scaling factor between the target-and source-plane has been proposed for the laser propagation in the optical system design, which can be used to evaluate the laser optical system performance and the tolerance analysis. The laser propagation in the optical systems can be calculated by the Collins integral formula, and an angular spectrum method has been derived by coordinate substitution. A scaling factor m is introduced to make the choice of the observation-plane more flexibility and the calculation more accurate. The laser optical system has been designed, and its tolerance analysis is conducted by the Angular-Spectrum method. The evaluating criterion is the laser spot radius in the far field, which is defined by 86.5% power in bucket (PIB). The radius of the laser spot in 90m between 0.8mm and 1.4mm with the expectation of 0.92mm is calculated by the tolerance analysis, and the experimental result is 1.01mm. In the distance of 47m, the radius is between 0.42mm and 0.73mm with the expectation of 0.48mm calculated by the tolerance analysis, the experimental result is 0.46mm. The experiment agrees the result of the tolerance analysis well. The focal shift for laser propagation in the optical systems is validated. The experiment results confirm the calculation and it proved the use of the method in laser focus optical system design.

Upconversion, MRI imaging and optical trapping studies of silver nanoparticle decorated multifunctional NaGdF4:Yb,Er nanocomposite

2021 ◽  
Author(s):  
S. Yamini ◽  
Gunaseelan M ◽  
Ajithkumar Gangadharan ◽  
Silverio A Lopez ◽  
Karen Martirosyan ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Optical Trapping ◽  
Magnetic Measurement ◽  
Upconversion Luminescence ◽  
Resonance Effect ◽  
Optical Tweezer ◽  
Upconversion Nanoparticles ◽  
Chemical Compositions ◽  
Mri Imaging

Abstract The multifunctional upconversion nanoparticles are fascinating tool for biological applications. In the present work, photon upconverting NaGdF4:Yb,Er and Ag nanoparticles decorated NaGdF4:Yb,Er (NaGdF4:Yb,Er@Ag) nanoparticles were prepared using a simple polyol process. Rietveld refinement was performed for detailed crystal structural and phase fraction analysis. The morphology of the NaGdF4:Yb,Er@Ag was examined using HRTEM, which reveals silver nanoparticles of 8 nm in size were decorated over spherical shaped NaGdF4:Yb,Er nanoparticles with a mean particle size of 90 nm. The chemical compositions were confirmed by EDAX and ICP-OES analyses. The upconversion luminescence (UCL) of NaGdF4:Yb,Er at 980 nm excitation showed an intense red emission. After incorporating the silver nanoparticles, the UCL intensity decreased due to weak scattering and surface plasmon resonance effect (SPR). The VSM magnetic measurement indicates both the upconversion nanoparticles possess paramagnetic behaviour. The NaGdF4:Yb,Er@Ag showed CT imaging. MRI study exhibited better T1 weighted relaxivity in the NaGdF4:Yb,Er than the commercial Gd-DOTA. For the first time, the optical trapping was successfully demonstrated for the upconversion NaGdF4:Yb,Er nanoparticle at NIR 980 nm light using an optical tweezer setup. The optically trapped upconversion nanoparticle possessing paramagnetic property exhibited a good optical trapping stiffness. The UCL of trapped single UCNP is recorded to explore the effect of the silver nanoparticles. The multifunctional properties for the NaGdF4:Yb,Er@Ag nanoparticle are demonstrated.

scholarly journals Besinc Pseudo-Schell Model Sources with Circular Coherence

2019 ◽  
Vol 9 (13) ◽  
pp. 2716 ◽  
Author(s):  
Rosario Martínez-Herrero ◽  
Gemma Piquero ◽  
Juan Carlos González de Sande ◽  
Massimo Santarsiero ◽  
Franco Gori
Keyword(s):  
Potential Application ◽  
Optical Trapping ◽  
Intensity Profile ◽  
Partially Coherent ◽  
Degree Of Coherence ◽  
Coherent Sources ◽  
Different Types ◽  
The Difference ◽  
Partially Coherent Sources

Partially coherent sources with non-conventional coherence properties present unusual behaviors during propagation, which have potential application in fields like optical trapping and microscopy. Recently, partially coherent sources exhibiting circular coherence have been introduced and experimentally realized. Among them, the so-called pseudo Schell-model sources present coherence properties that depend only on the difference between the radial coordinates of two points. Here, the intensity and coherence properties of the fields radiated from pseudo Schell-model sources with a degree of coherence of the besinc type are analyzed in detail. A sharpening of the intensity profile is found for the propagated beam by appropriately selecting the coherence parameters. As a possible application, the trapping of different types of dielectric nanoparticles with this kind of beam is described.

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