Towards Casimir force measurements with optical tweezers (Conference Presentation)

2017 ◽  
Author(s):  
Paulo A. Maia Neto ◽  
Luis Pires ◽  
Diney Ether ◽  
Ricardo S. Decca ◽  
Nathan B. Viana ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Casimir Force ◽  
Force Measurements

Casimir forces and vacuum energy

2017 ◽  
Author(s):  
Serge Reynaud ◽  
Astrid Lambrecht
Keyword(s):  
Casimir Force ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Thermal Fluctuations ◽  
Model Systems ◽  
Vacuum Field ◽  
Force Measurements ◽  
Casimir Forces ◽  
Current State ◽  
Field Fluctuations

The Casimir force is an effect of quantum vacuum field fluctuations, with applications in many domains of physics. The ideal expression obtained by Casimir, valid for perfect plane mirrors at zero temperature, has to be modified to take into account the effects of the optical properties of mirrors, thermal fluctuations, and geometry. After a general introduction to the Casimir force and a description of the current state of the art for Casimir force measurements and their comparison with theory, this chapter presents pedagogical treatments of the main features of the theory of Casimir forces for one-dimensional model systems and for mirrors in three-dimensional space.

scholarly journals Hemodynamic forces can be accurately measured in vivo with optical tweezers

2017 ◽  
Author(s):  
Sébastien Harlepp ◽  
Fabrice Thalmann ◽  
Gautier Follain ◽  
Jacky G. Goetz
Keyword(s):  
Optical Tweezers ◽  
Cell Biology ◽  
Accurate Determination ◽  
Force Measurements ◽  
Hemodynamic Forces ◽  
Non Invasive ◽  
Drag Forces ◽  
Measured Flow ◽  
Living Organisms

AbstractForce sensing and generation at the tissular and cellular scale is central to many biological events. There is a growing interest in modern cell biology for methods enabling force measurements in vivo. Optical trapping allows non-invasive probing of pico-Newton forces and thus emerged as a promising mean for assessing biomechanics in vivo. Nevertheless, the main obstacles rely in the accurate determination of the trap stiffness in heterogeneous living organisms, at any position where the trap is used. A proper calibration of the trap stiffness is thus required for performing accurate and reliable force measurements in vivo. Here, we introduce a method that overcomes these difficulties by accurately measuring hemodynamic profiles in order to calibrate the trap stiffness. Doing so, and using numerical methods to assess the accuracy of the experimental data, we measured flow profiles and drag forces imposed to trapped red blood cells of living zebrafish embryos. Using treatments enabling blood flow tuning, we demonstrated that such method is powerful in measuring hemodynamic forces in vivo with accuracy and confidence. Altogether, this study demonstrates the power of optical tweezing in measuring low range hemodynamic forces in vivo and offers an unprecedented tool in both cell and developmental biology.

scholarly journals DEVELOPMENT OF A HIGH-SENSITIVITY TORSION BALANCE TO INVESTIGATE THE THERMAL CASIMIR FORCE

2012 ◽  
Vol 14 ◽  
pp. 337-346 ◽  
Author(s):  
TODD GRAVESON ◽  
CHARLES RACKSON ◽  
WOO-JOONG KIM
Keyword(s):  
Casimir Force ◽  
High Sensitivity ◽  
Torsion Balance ◽  
Surface Patch ◽  
Experimental Investigations ◽  
Electric Force ◽  
Force Measurements ◽  
Semiconducting Materials ◽  
Proper Understanding ◽  
Actual Contribution

We report development of a high-sensitivity torsion balance to measure the thermal Casimir force. Special emphasis is placed on experimental investigations of a possible surface electric force originating from surface patch potentials that have been recently noticed by several experimental groups. By gaining a proper understanding of the actual contribution of the surface electric force in real materials, we aim to undertake precision force measurements to resolve the Casimir force at finite temperature in real metals, as well as in other semiconducting materials, such as graphene.

Dynamic tether force measurements of the outer hair cells plasma membrane with optical tweezers

2001 ◽  
Author(s):  
Bahman Anvari ◽  
Zhiwei Li ◽  
Masayoshi Takashima ◽  
Peter Brecht ◽  
Jorge H. Torres ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Optical Tweezers ◽  
Hair Cells ◽  
Outer Hair Cells ◽  
Force Measurements

scholarly journals Optical Tweezers for Quantitative Force Measurements and Live Cell Experiments

2014 ◽  
Vol 22 (4) ◽  
pp. 24-31 ◽  
Author(s):  
Philipp Rauch ◽  
Torsten Jähnke
Keyword(s):  
Optical Tweezers ◽  
Live Cell ◽  
Force Measurements

CASIMIR FORCE EXPERIMENTS IN AIR: TWO BIRDS WITH ONE STONE

2010 ◽  
Vol 25 (11) ◽  
pp. 2231-2239 ◽  
Author(s):  
S. DE MAN ◽  
K. HEECK ◽  
K. SMITH ◽  
R. J. WIJNGAARDEN ◽  
D. IANNUZZI
Keyword(s):  
Atomic Force Microscope ◽  
High Precision ◽  
Electrostatic Potential ◽  
Casimir Force ◽  
Hydrodynamic Force ◽  
Force Sensor ◽  
Force Measurements ◽  
Atomic Force ◽  
Potential Measure ◽  
Interacting Surfaces

We present a short overview of the recent efforts of our group in the design of high precision Casimir force setups. We first describe our Atomic Force Microscope based technique that allows one to simultaneously and continuously calibrate the instrument, compensate for a residual electrostatic potential, measure the Casimir force, and, in the presence of a fluid in the gap between the interacting surfaces, measure the hydrodynamic force. Then we briefly discuss a new force sensor that adapts well to Casimir force measurements in critical environments.

Precision force measurements with optical tweezers

2020 ◽  
Author(s):  
Declan Armstrong ◽  
Alexander B. Stilgoe ◽  
Timo Nieminen ◽  
Halina Rubinsztein-Dunlop
Keyword(s):  
Optical Tweezers ◽  
Force Measurements

scholarly journals Improved tests of extra-dimensional physics and thermal quantum field theory from new Casimir force measurements

2003 ◽  
Vol 68 (11) ◽  
Author(s):  
R. S. Decca ◽  
E. Fischbach ◽  
G. L. Klimchitskaya ◽  
D. E. Krause ◽  
D. López ◽  
...  
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Casimir Force ◽  
Quantum Field ◽  
Force Measurements

Optical tweezers force measurements to study parasites chemotaxis

2009 ◽  
Author(s):  
A. A. de Thomaz ◽  
L. Y. Pozzo ◽  
A. Fontes ◽  
D. B. Almeida ◽  
C. V. Stahl ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Force Measurements
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