Thematische Bibliographien / Optická levitace

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Auswahl der wissenschaftlichen Literatur zum Thema „Optická levitace“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "Optická levitace"

Misconi, Nebil Y. „New technique for levitating solid particles using a proton beam“. Laser and Particle Beams 14, Nr. 3 (September 1996): 501–10. http://dx.doi.org/10.1017/s026303460001017x.

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A new technique for levitating solid particles inside a vacuum chamber is developed using a proton beam. This new technique differs from the classical laser-levitation technique invented by Ashkin in that it does not heat up light-absorbing levitated particles to vaporization. This unique property of the method will make it possible to levitate real interplanetary dust particles in a vacuum chamber and study their spin-up dynamics in a ground-based laboratory. It is found that a flux of protons from a proton gun of ~1015 cm–2 sec–1 is needed to levitate a 10-mm particle. Confinement of the levitated particle can be achieved by a Z or θ pinch to create a gravity well, or by making the beam profile doughnut in shape.

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Kuhn, Stefan, Alon Kosloff, Benjamin A. Stickler, Fernando Patolsky, Klaus Hornberger, Markus Arndt und James Millen. „Full rotational control of levitated silicon nanorods“. Optica 4, Nr. 3 (13.03.2017): 356. http://dx.doi.org/10.1364/optica.4.000356.

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Arita, Yoshihiko, Ewan M. Wright und Kishan Dholakia. „Optical binding of two cooled micro-gyroscopes levitated in vacuum“. Optica 5, Nr. 8 (26.07.2018): 910. http://dx.doi.org/10.1364/optica.5.000910.

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Gaszynski, Tomasz, Monika Pietrzyk, Tomasz Szewczyk und Ewelina Gaszynska. „A Comparison of Performance of Endotracheal Intubation Using the Levitan FPS Optical Stylet or Lary-Flex Videolaryngoscope in Morbidly Obese Patients“. Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/207591.

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Introduction.The use of videolaryngoscopes is recommended for morbidly obese patients. The aim of the study was to evaluate the Levitan FPS optical stylet (Levitan) vs Lafy-Flex videolaryngoscope (Lary-Flex) in a group of MO patients.Methods.Seventy-nine MO (BMI>40 kg m−2) patients scheduled for bariatric surgery were included in the study and randomly allocated to the Levitan FPS or Lary-Flex group. The primary endpoint was time to intubation and evaluation laryngoscopic of glottic view. Anesthesiologists were asked to evaluate the glottic view first under direct laryngoscopy using the videolaryngoscope as a standard laryngoscope (monitor display was excluded from use) and then using devices. The secondary endpoint was the cardiovascular response to intubation and the participant’s evaluation of such devices.Results.The time to intubation was8.572.66 sec. versus5.790.2 sec. for Levitan and Lary-Flex, respectively (P<0.05). In all cases of CL grade>1under direct laryngoscopy, the study devices improved CL grade to 1. The Levitan FPS produced a greater cardiovascular response than the Lary-Flex videolaryngoscope.Conclusion.The Lary-Flex videolaryngoscope and the Levitan FPS optical stylet improve the laryngeal visualization in morbidly obese patients, allowing for fast endotracheal intubation, but Lary-Flex produces less cardiovascular response to intubation attempt.

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Marshall, Frances H., Rachael E. H. Miles, Young-Chul Song, Peter B. Ohm, Rory M. Power, Jonathan P. Reid und Cari S. Dutcher. „Diffusion and reactivity in ultraviscous aerosol and the correlation with particle viscosity“. Chemical Science 7, Nr. 2 (2016): 1298–308. http://dx.doi.org/10.1039/c5sc03223g.

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Magrini, Lorenzo, Richard A. Norte, Ralf Riedinger, Igor Marinković, David Grass, Uroš Delić, Simon Gröblacher, Sungkun Hong und Markus Aspelmeyer. „Near-field coupling of a levitated nanoparticle to a photonic crystal cavity“. Optica 5, Nr. 12 (13.12.2018): 1597. http://dx.doi.org/10.1364/optica.5.001597.

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Temperton, Robert H., Richard J. A. Hill und James S. Sharp. „Mechanical vibrations of magnetically levitated viscoelastic droplets“. Soft Matter 10, Nr. 29 (2014): 5375–79. http://dx.doi.org/10.1039/c4sm00982g.

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Gao, Xiaoyan, Chen Cai, Jiabi Ma und Yunhong Zhang. „Repartitioning of glycerol between levitated and surrounding deposited glycerol/NaNO 3 /H 2 O droplets“. Royal Society Open Science 5, Nr. 1 (Januar 2018): 170819. http://dx.doi.org/10.1098/rsos.170819.

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Repartitioning of semi-volatile organic compounds (SVOCs) between particles is an important process to understand the particle growth and shrinkage in the atmosphere environment. Here, by using optical tweezers coupled with cavity-enhanced Raman spectroscopy, we report the repartitioning of glycerol between a levitated glycerol/NaNO 3 /H 2 O droplet and surrounding glycerol/NaNO 3 /H 2 O droplets deposited on the inner wall of a chamber with different organic to inorganic molar ratios (OIRs). For the high OIR with 3 : 1, no NaNO 3 crystallization occurs both for levitated and deposited droplets in the whole relative humidity (RH) range, the radius of the levitated droplet decreases slowly due to the evaporation of glycerol from the levitated droplet at constant RHs. The levitated droplets radii with OIR of 1 : 1 and 1 : 3 increase with constant RHs that are lower than 45.3% and 55.7%, respectively, indicating that the repartitioning of glycerol occurs. The reason is that NaNO 3 in the deposited droplets is crystallized when RH is lower than 45.3% for 1 : 1 or 55.7% for 1 : 3. So the vapour pressure of glycerol at the surface of deposited droplets is higher than that of the levitated droplet which always remains as liquid droplet without NaNO 3 crystallization, resulting in the transfer of glycerol from the deposited ones to the levitated one. The process of the glycerol repartitioning we discussed herein is a useful model to interpret the repartitioning of SVOCs between the externally mixed particles with different phase states.

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Webb, A., H. Kolawole, S. Leong, T. E. Loughnan, T. Crofts und C. Bowden. „Comparison of the Bonfils and Levitan Optical Stylets for Tracheal Intubation: A Clinical Study“. Anaesthesia and Intensive Care 39, Nr. 6 (November 2011): 1093–97. http://dx.doi.org/10.1177/0310057x1103900618.

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The Bonfils and Levitan FPS™ scopes are rigid fibreoptic stylets that may assist routine or difficult intubation. This study compared the effectiveness of each in patients with predicted normal airways when used by specialist anaesthetists with no prior experience using optical stylets. Twelve anaesthetists and 324 elective surgical patients participated. Six anaesthetists were randomised to first intubate 20 patients with the Levitan scope (Phase 1) followed by a further seven patients with the Bonfils scope (Phase 2). The other six participating anaesthetists undertook their first 20 intubations with the Bonfils (Phase 1), followed by seven intubations with the Levitan (Phase 2). Outcomes recorded were success rate, total time to intubation, number of attempts, ease of intubation score and incidence of complications. Overall failure rates were similar for the two scopes with 5.6% of patients not intubated after three attempts. Median total times to intubation were similar for the Levitan (44 seconds) and Bonfils (36 seconds) (P=0.11). Participants using the Bonfils in Phase 1 had significantly higher chance of success on first attempt (73%) compared to Levitan users during Phase 1 (57%) (P=0.008). These differences were not significant in the second phase and ease of intubation scores were similar for both scopes (P=0.9). This study showed the two scopes were comparable but the high failure rate amongst novice users demonstrated the importance of familiarity and skill development prior to their introduction to a difficult airway cart.

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Zhu, Xunmin, Nan Li, Jianyu Yang, Xingfan Chen und Huizhu Hu. „Displacement Detection Decoupling in Counter-Propagating Dual-Beams Optical Tweezers with Large-Sized Particle“. Sensors 20, Nr. 17 (31.08.2020): 4916. http://dx.doi.org/10.3390/s20174916.

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As a kind of ultra-sensitive acceleration sensing platform, optical tweezers show a minimum measurable value inversely proportional to the square of the diameter of the levitated spherical particle. However, with increasing diameter, the coupling of the displacement measurement between the axes becomes noticeable. This paper analyzes the source of coupling in a forward-scattering far-field detection regime and proposes a novel method of suppression. We theoretically and experimentally demonstrated that when three variable irises are added into the detection optics without changing other parts of optical structures, the decoupling of triaxial displacement signals mixed with each other show significant improvement. A coupling detection ratio reduction of 49.1 dB and 22.9 dB was realized in radial and axial directions, respectively, which is principally in accord with the simulations. This low-cost and robust approach makes it possible to accurately measure three-dimensional mechanical quantities simultaneously and may be helpful to actively cool the particle motion in optical tweezers even to the quantum ground state in the future.

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Dissertationen zum Thema "Optická levitace"

Flajšmanová, Jana. „Behaviour of Objects in Structured Light Fields and Low Pressures“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444991.

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Studium chování opticky zachycených částic nám umožňuje porozumět základním fyzikálním jevům plynoucím z interakce světla a hmoty. Předkládaná práce podává vysvětlení zesílení tažné síly působící na opticky svázané částice ve strukturovaném světelném poli, tzv. tažném svazku. Ukazujeme, že pohyb dvou opticky svázaných objektů v tažném svazku je silně závislý na jejich vzájemné vzdálenosti a prostorové orientaci, což rozšiřuje možnosti manipulace hmoty pomocí světla. Následně se práce zaměřuje na levitaci opticky zachycených částic ve vakuu. Představujeme novou metodologii na charakterizaci vlastností slabě nelinearního Duffingova oscilátoru reprezentovaného opticky levitující částicí. Metoda je založena na průměrování trajektorií s určitou počáteční pozicí ve fázovém prostoru sestávajícím z polohy a rychlosti částice a poskytuje informaci o parametrech oscilátoru přímo ze zaznamenaného pohybu. Náš inovativní postup je srovnán s běžně užívanou metodou založenou na analýze spektrální hustoty polohy částice a za využití numerických simulací ukazujeme její použitelnost i v nízkých tlacích, kde nelinearita hraje významnou roli.

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Zucconi, Galli Fonseca P. „Levitated optomechanics in a hybrid electro-optical trap“. Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1567776/.

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This thesis describes the progress made in trapping and cooling silica nanoscale particles, in a hybrid electro-optical trap. The light field of a high finesse Fabry-Perot cavity and the quadrupole field generated by an rf Paul trap are used for the first time to both trap and cool naturally charged 209 nm dielectric nanospheres in high vacuum. Particles are first loaded into the Paul trap at pressures of 10^-1 mbar, after which their centre-of-mass motion is damped via optomechanical cooling, as the pressure is lowered to 10^-6 mbar. The combined ion trap-optical cavity set-up exposes an interesting interplay between the ion trap dynamics and the cavity mode which lead to a novel optomechanical cooling mechanism of a cyclic nature. This eliminates the need for a second, dedicated cooling mode from the cavity, or feedback cooling in order to cool the levitated particles to the ground state. At the same time, we identify a previously unobserved shift of the Paul trap secular frequencies due to the optical cavity, which enables readout of key parameters, such as the nanoparticles charge and the mean number of photons in the cavity. The dynamical features of the levitated particle, driven by linear and nonlinear optomechanical coupling, are observed through the cavity output, as well as the light scattered by the particle. As the background pressure is lowered, we observe greater than 1000 fold reduction in the centre-of-mass temperature of particles, before temperatures fall below the read-out sensitivity of the set-up.

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Coppock, Joyce Elizabeth. „Optical and Magnetic Measurements of a Levitated, Gyroscopically Stabilized Graphene Nanoplatelet“. Thesis, University of Maryland, College Park, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10641221.

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I discuss the design and operation of a system for levitating a charged, μm-scale, multilayer graphene nanoplatelet in a quadrupole electric field trap in high vacuum. Levitation decouples the platelet from its environment and enables sensitive mechanical and magnetic measurements.

First, I describe a method of generating and trapping the nanoplatelets. The platelets are generated via liquid exfoliation of graphite pellets and charged via electrospray ionization. Individual platelets are trapped at a pressure of several hundred mTorr and transferred to a trap in a second chamber, which is pumped to UHV pressures for further study. All measurements of the trapped platelet's motion are performed via optical scattering.

Second, I present a method of gyroscopically stabilizing the levitated platelet. The rotation frequency of the platelet is locked to an applied radio frequency (rf) electric field E_rf. Over time, frequency-locking stabilizes the platelet so that its axis of rotation is normal to the platelet and perpendicular to E_rf.

Finally, I present optical data on the interaction of a multilayer graphene platelet with an applied magnetic field. The stabilized nanoplatelet is extremely sensitive to external torques, and its low-frequency dynamics are determined by an applied magnetic field. Two mechanisms of interaction are observed: a diamagnetic polarizability and a magnetic moment proportional to the frequency of rotation. A model is constructed to describe this data, and experimental values are compared to theory.

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Gorkowski, Kyle J. „The Morphology and Equilibration of Levitated Secondary Organic Particles Under Controlled Conditions“. Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1067.

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I advanced the understanding of particle morphology and its implications for the behavior and effects of atmospheric aerosol particles. I have developed new experimental methods for the Aerosol Optical Tweezers (AOT) system and expanded the AOT’s application into studying realistic secondary organic aerosol (SOA) particle phases. The AOT is a highly accurate system developed to study individual particles in real-time for prolonged periods of time. While previous AOT studies have focused on binary or ternary chemical systems, I have investigated complex SOA, and how they interact with other chemical phases, and the surrounding gas-phase. This work has led to new insights into liquid-liquid phase separation and the resulting particle morphology, the surface tension, solubility, and volatility of SOA, and diffusion coefficients of SOA phases. I designed a new aerosol optical tweezers chamber for delivering a uniformly mixed aerosol flow to the trapped droplet’s position. I used this chamber to determine the phase-separation morphology and resulting properties of complex mixed droplets. A series of experiments using simple compounds are presented to establish my ability to use the cavity enhanced Raman spectra to distinguish between homogenous single-phase, and phase-separated core-shell or partially-engulfed morphologies. I have developed a new algorithm for the analysis of whispering gallery modes (WGMs) present in the cavity enhanced Raman spectra retrieved from droplets trapped in the AOT. My algorithm improves the computational scaling when analyzing core-shell droplets (i.e. phase-separated or biphasic droplets) in the AOT, making it computationally practical to analyze spectra collected over many hours at a few Hz. I then demonstrate for the first time the capture and analysis of SOA on a droplet suspended in an AOT. I examined three initial chemical systems of aqueous NaCl, aqueous glycerol, and squalane at ~ 75% relative humidity. For each system I added α-pinene SOA – generated directly in the AOT chamber – to the trapped droplet. The resulting morphology was always observed to be a core of the initial droplet surrounded by a shell of the added SOA. By combining my AOT observations of particle morphology with results from SOA smog chamber experiments, I conclude that the α-pinene SOA shell creates no major diffusion limitations for water, glycerol, and squalane under humid conditions. My AOT experiments highlight the prominence of phase-separated core-shell morphologies for secondary organic aerosols interacting with a range of other chemical phases. The unique analytical capabilities of the aerosol optical tweezers provide a new approach for advancing the understanding of the chemical and physical evolution of complex atmospheric particulate matter, and the important environmental impacts of aerosols on atmospheric chemistry, air quality, human health, and climate change.

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(9127940), Jonghoon Ahn. „Spin Optomechanics of Levitated Nanoparticles“. Thesis, 2020.

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With the unique advantage of great isolation from the thermal environment, levitated optomechanics has emerged as a powerful platform for various fields of physics including microscopic thermodynamics, precision measurements, and quantum mechanics. Experiments with optically levitated micro- and nanoparticles have already obtained remarkable feats of zeptonewton force sensing and ground-state cooling. The novel system has also been proposed to assess various theories including the objective collapse models and macroscopic quantum mechanics.

This thesis reports experimental results on a levitated Cavendish torsion balance, a GHz nanomechanical rotor, and a torque sensor with unprecedented sensitivity realized with optically levitated nanoparticles in a vacuum environment. The system at room temperature achieves a sensitivity of (4.2±1.2)×10−27Nm/ √ Hz surpassing the sensitivity of most advanced nanofabricated torque sensors at cryogenic environments. Calculations suggest potential detection of Casimir torque and vacuum friction under realistic conditions. Moreover, the nanoparticles are driven into ultrafast rotations exceeding 5 GHz, which achieves the fastest humanmade nanomechanical rotor. Such fast rotations allow studies on the ultimate tensile strength of the nanoparticles as well.

Subsequently, the electron spin control of nitrogen vacancies (NV) in optically trapped diamond naoparticles is demonstrated in low vacuum. The configuration is analogous to trapped atoms and ions which serve as a quantum system with internal states. The effect of the air pressure, surrounding gas, and laser power on the electron spin resonance (ESR) are studied, and the temperature of the diamond is also measured with the ESR. The levitated nanodiamonds will provide the means to implement a hybrid spin-optomechanical system.

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Krishnan, Shankar. „Thermophysical and optical property measurements of electromagnetically levitated liquid metals“. Thesis, 1989. http://hdl.handle.net/1911/16248.

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Electromagnetic levitation was used in conjunction with drop calorimetry to determine the enthalpy increments and heats of fusion of an Al-Ni bronze and a Ni-based superalloy. The results showed some curvature to the enthalpy data in the two phase region (solid-liquid). Additionally, excellent agreement was seen with the measured specific heats for the liquid, C$\sb{\rm p}$(l), with those calculated with the Neumann-Koop sum rule. Further, a unique multiple-view photographic technique was developed for the determination of liquid metal densities at elevated temperatures. High speed photography utilizing film and video techniques and a technique utilizing laser reflectance were used to study liquid metal droplet dynamics. These included electromagnetic levitation studies of Cu, Ni, and Ni-base alloys. Initial experiments revealed interesting dynamics of the droplets that included axisymmetric oscillation, rotation, and oscillation mode changes. Based on the photographic and FFT information, it was possible to extract liquid metal surface tensions. The development of a unique, non-contact, temperature measurement device utilizing rotating analyzer ellipsometry is described. The technique circumvents the necessity of spectral emissivity estimation by direct measurement concomitant with radiance brightness. Initial studies involved the measurement of the optical properties and spectral emissivities at 633 nm for several resistively heated metals. These metals included Hf, Ir, Mo, Nb, Pd, Pt, V and Ta, and were studied in the temperature range 1000-2500 K. Additionally, the oxidation behavior of iridium was studied. Using this approach, the optical properties of electromagnetically levitated liquid metals Cu, Ag, Au, Ni, Pd, Pt, Zr were measured in situ as a function of temperature and wavelength. These measurements were performed at 1064, 632.8, 514.5 and 488 nm. Temperature dependence was examined up to 600 K superheat in the liquid. Additionally, measurements on the levitated undercooled liquid and solid were also performed. The data suggests an increase in the emissivity of the liquid compared with the incandescent solid. Moderate temperature dependence of the dielectric constants and spectral emissivities were observed for the liquid metals studied. The temperature dependence appeared to be stronger when the wavelength of the light was near an absorption edge. The spectral emissivity of the undercooled liquids were virtually the same as that of the liquid but slighlly lower for moderate undercoolings ($<$50 K). Excellent agreement with available data for dielectric constants and refractive indices was seen.

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(9643427), Troy A. Seberson. „Heating and Cooling Mechanisms for the Thermal Motion of an Optically Levitated Nanoparticle“. Thesis, 2020.

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Bridging the gap between the classical and quantum regimes has consequences not only for fundamental tests of quantum theory, but for the relation between quantum mechanics and gravity. The field of levito-dynamics provides a promising platform for testing the hypotheses of the works investigating these ideas. By manipulating a macroscopic particle's motion to the scale of its ground state wavefunction, levito-dynamics offers insight into the macroscopic-quantum regime.

Ardent and promising research has brought the field of levito-dynamics to a state in which these tests are available. Recent work has brought a mesoscopic particle's motion to near the ground state. Several factors of decoherence are limiting efficient testing of these fundamental theories which implies the need for alternative strategies for achieving the same goal. This thesis is concerned with investigating alternative methods that may enable a mesoscopic particle to reach the quantum regime.

In this thesis, three theoretical proposals are studied as a means for a mesoscopic particle to reach the quantum regime as well as a detailed study into one of the most important factors of heating and decoherence for optical trapping. The first study of cooling a particle's motion highlights that the rotational degrees of freedom of a levitated symmetric-top particle leads to large harmonic frequencies compared to the translational motion, offering a more accessible ground state temperature after feedback cooling is applied. An analysis of a recent experiment under similar conditions is compared with the theoretical findings and found to be consistent. 

The second method of cooling takes advantage of the decades long knowledge of atom trapping and cooling. By coupling a spin-polarized, continuously Doppler cooled atomic gas to a magnetic nanoparticle through the dipole-dipole interaction, motional energy is able to be removed from the nanoparticle. Through this method, the particle is able to reach near its quantum ground state provided the atoms are at a temperature below the nanoparticle ground state temperature and the atom number is sufficiently large.
The final investigation presents the dynamics of an optically levitated dielectric disk in a Gaussian standing wave. Though few studies have been performed on disks both theoretically and experimentally, our findings show that the stable couplings between the translational and rotational degrees of freedom offer a possibility for cooling several degrees of freedom simultaneously by actively cooling a single degree freedom.

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Wu, Wen-I., und 吳文益. „Magnetically Levitated Vertical Mirrors with Addressable Electrostatic Actuation for MEMS Switches in Fiber-Optic Communication“. Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50285161640397694046.

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碩士
國立臺灣大學
應用力學研究所
89
An innovative, magnetically levitated vertical mirror optical switch with addressable, electrostatic actuation has been designed and fabricated by using MEMS (Microelectromechanical systems) technology. The optical micromachined switch consists of a rotatable out-of-plane thin plate and a vertical micro mirror in which both are jointed in soldering. In the structural segment with a dual torsion design, the magnetically twisted micro actuator in the up position demonstrates a higher levitation compared to single torsion design. In addition, the actuator is electrostatically driven, clamping continuously down with a lower voltage. The fabrication of the optical switches employs the micro assembly-transfer technique that allows the vertical mirror and the torsional actuator individually manufactured and optimized prior to integration assembly. By taking the best advantage of the technique, the mirrors are anisotropically bulk-micromachined with a Si (110) wafer, leading to virtually perfect verticality of crystal planes with respect to a wafer surface. The silicon dual-torsion thin plate of the actuator is formed by an etching time control, and then assembled with a bottom electrode. The segmental, dual torsion micro plate that was upward twisted in an external magnetic field and then electrostatically clamped down was first demonstrated. Theoretical calculation and experiment were also conducted for both signal- and dual-torsion actuators in a good agreement. In the up position of the externally magnetic strength at 380 Gauss, the dual-torsion plate achieved a large out-of-plane tip separation of around 1793 m, while the single-torsion one was measured to be 1086 m. Moreover, the dual-torsion actuator was able to clamp the structure down at 13 volt, while more than 30 volt for the single-torsion plate was required. Therefore, the novel design of the present study is expected to have wide applications of large displacement, and low driving voltage, as well as addressable control in an array configuration.

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„Studies of morphology-dependent-resonances by mie scattering of laser-levitated microdroplet =: 利用光懸浮微液滴的米氏散射硏究形態相關共振“. 2002. http://library.cuhk.edu.hk/record=b5891077.

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by Lee Hon Shing.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2002.
Includes bibliographical references (leaves 105-106).
Text in English; abstracts in English and Chinese.
by Lee Hon Shing.
Acknowledgements --- p.i
Abstract --- p.ii
Chapter Chapter 1 --- Introduction --- p.1
Chapter Chapter 2 --- Theory --- p.4
Chapter 2.1 --- Radiation pressure on a microdroplet --- p.5
Chapter 2.2 --- Mie scattering theory --- p.8
Chapter 2.3 --- Laser levitation of a microdroplet --- p.11
Chapter Chapter 3 --- Dual wavelength experiment --- p.14
Chapter 3.1 --- Introduction --- p.15
Chapter 3.2 --- Experiment --- p.16
Chapter 3.2.1 --- Dual wavelength experiment --- p.16
Chapter 3.2.2 --- Measurement of the levitating laser beam waist --- p.20
Chapter 3.2.3 --- Measurement of the levitating laser beam profile --- p.22
Chapter 3.3 --- Data analysis and results --- p.25
Chapter 3.3.1 --- Deducing the size of a microdroplet by exploiting Ib(t) and Ig(t) --- p.27
Chapter 3.3.2 --- Intensity as functions of size parameter --- p.32
Chapter 3.3.3 --- Vertical position as a function of size parameter --- p.39
Chapter 3.3.4 --- Comparison between experimental and theoretical results --- p.43
Chapter 3.3.5 --- Broadening of MDRs --- p.55
Chapter 3.3.6 --- Fine correction factor --- p.60
Chapter Chapter 4 --- Deformation of a laser-levitated water microdroplet --- p.63
Chapter 4.1 --- Introduction --- p.64
Chapter 4.2 --- Experiment --- p.65
Chapter 4.2.1 --- Dual wavelength experiment --- p.65
Chapter 4.2.2 --- Double-slit experiment --- p.65
Chapter 4.3 --- Data analysis and results --- p.68
Chapter 4.3.1 --- """Cross-talk"" in dual wavelength experiment" --- p.69
Chapter 4.3.2 --- MDR-induced oscillation of a laser-levitated water mircodroplet in dual wavelength experiment --- p.74
Chapter 4.3.3 --- MDR-induced oscillation of a laser-levitated water mircodroplet in double-slit experiment --- p.81
Chapter Chapter 5 --- Step-function levitation force experiment --- p.85
Chapter 5.1 --- Introduction --- p.86
Chapter 5.2 --- Step-function levitation force experiment --- p.87
Chapter 5.3 --- Data analysis and results --- p.90
Chapter 5.3.1 --- Deducing the size of the microdroplet by its vertical position --- p.91
Chapter 5.3.2 --- Intensity curves of the step-function levitation force experiment --- p.95
Chapter Chapter 6 --- Conclusion and future outlook --- p.99
Chapter 6.1 --- Conclusion --- p.99
Chapter 6.2 --- Future outlook --- p.101
Appendix A --- p.103
Appendix B --- p.104
References --- p.105

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„Motion of a single optically levitated micro-droplet driven by morphology-dependent-resonances =: 由形態相關共振引起的光浮微水珠運動“. Chinese University of Hong Kong, 1996. http://library.cuhk.edu.hk/record=b5888949.

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by Chan Chiu Wah.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1996.
Includes bibliographical references (leaves [68-69]).
by Chan Chiu Wah.
List of Tables --- p.i
List of Figures --- p.ii
Acknowledgments --- p.iv
Abstract --- p.v
Chapter Chapter 1 --- Introduction --- p.1
Chapter Chapter 2 --- Theory --- p.4
Chapter 2.1 --- Radiation pressure on a droplet --- p.4
Chapter 2.2 --- Laser levitation of a droplet --- p.7
Chapter 2.3 --- Dynamic of a laser levitated spherical droplet --- p.9
Chapter Chapter 3 --- Experiment --- p.11
Chapter 3.1 --- Principle and calibration of the position sensor --- p.14
Chapter 3.2 --- Measurement of the levitated laser beam waist --- p.16
Chapter Chapter 4 --- Results and discussion --- p.18
Chapter 4.1 --- Vertical motion due to MDRs --- p.22
Chapter 4.2 --- Artifacts in the displacement --- p.26
Chapter 4.3 --- Elastic scattering light intensity --- p.28
Chapter 4.4 --- Effect of the size of beam waist --- p.31
Chapter 4.5 --- Small size parameter droplet --- p.33
Chapter Chapter 5 --- Conclusion and future outlook --- p.35

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Buchteile zum Thema "Optická levitace"

Krishnan, S., G. P. Hansen, R. H. Hauge und J. L. Margrave. „Emissivities and Optical Constants of Electromagnetically Levitated Liquid Metals as Functions of Temperature and Wavelength“. In Materials Chemistry at High Temperatures, 143–64. Totowa, NJ: Humana Press, 1990. http://dx.doi.org/10.1007/978-1-4612-0481-7_11.

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Romero-Isart, Oriol. „Optically Levitated Nanospheres for Cavity Quantum Optomechanics“. In Quantum Optomechanics and Nanomechanics, 369–98. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198828143.003.0010.

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This chapter introduces cavity quantum optomechanics with levitated nanospheres with some emphasis on preparing mesoscopic quantum superpositions and testing collapse models. It is divided into three parts: levitated quantum optomechanics: atoms vs. sphere; decoherence in levitated nanospheres; and wave-packet dynamics: coherence vs. decoherence. It is first shown how the master equation describing the dynamics of a polarizable object in a cavity along the cavity axis and that of the cavity mode is derived. Optical levitation is also discussed. It is then shown how most of the decoherence sources in levitated nanospheres can be cast into a relatively simple master equation describing position localization type of decoherence. Such decoherence tends to suppress the centre-of-mass position coherences. Finally, a discussion of wave-packet dynamics is given, with the motivation of using levitated nanospheres for matter-wave interferometry, that is, to create macroscopic quantum superpositions for testing quantum mechanics in unprecedented parameter regimes.

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Arnold, S. „SPECTROSCOPY OF SINGLE LEVITATED MICRON SIZED PARTICLES“. In Optical Effects Associated with Small Particles, 63–137. WORLD SCIENTIFIC, 1988. http://dx.doi.org/10.1142/9789814415804_0002.

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DAVIS, E. JAMES. „ELASTIC AND INELASTIC LIGHT SCATTERING FROM LEVITATED MICROPARTICLES“. In Optical Processes in Microparticles and Nanostructures, 83–106. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814295789_0005.

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Konferenzberichte zum Thema "Optická levitace"

Monteiro, Fernando, und Jiaxiang Wang. „Optically levitated dark matter sensors“. In Optical Trapping and Optical Micromanipulation XVIII, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2021. http://dx.doi.org/10.1117/12.2595416.

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Svak, Vojtěch, Jana Flajšmanová, Lukáš Chvátal, Martin Šiler, Alexander Jonáš, Jan Ježek, Stephen H. Simpson, Pavel Zemánek und Oto Brzobohatý. „Optically bound matter levitated in vacuum“. In Optical Trapping and Optical Micromanipulation XVIII, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2021. http://dx.doi.org/10.1117/12.2596308.

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Sasaki, Takashi, und Kazuhiro Hane. „Acoustically Levitated Spinning Optical Scanner“. In 2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers). IEEE, 2021. http://dx.doi.org/10.1109/transducers50396.2021.9495670.

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O'Flynn, Katie, Muddassar Rashid, Daniel Goldwater, Tracy E. Northup, Lukas Martinetz, Benjamin Stickler, Klaus Hornberger und James Millen. „Levitated electromechanics for particle trapping (Conference Presentation)“. In Optical Trapping and Optical Micromanipulation XVI, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2019. http://dx.doi.org/10.1117/12.2529282.

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Gieseler, Jan, Vijay Jain, Clemens Moritz, Christoph Dellago, Romain Quidant und Lukas Novotny. „Microscopic thermodynamics with levitated nanoparticles (Conference Presentation)“. In Optical Trapping and Optical Micromanipulation XIII, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2016. http://dx.doi.org/10.1117/12.2237380.

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Damková, Jana, Martin Šiler, Petr Jákl, Radim Filip, Oto Brzobohatý und Pavel Zemánek. „Motion of optically levitated nanoparticle in nonlinear regime“. In 21st Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, herausgegeben von Pavel Zemánek. SPIE, 2018. http://dx.doi.org/10.1117/12.2518115.

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Rider, Alexander, und Charles P. Blakemore. „Electrically driven, optically levitated micro-gyroscopes (Conference Presentation)“. In Optical Trapping and Optical Micromanipulation XVI, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2019. http://dx.doi.org/10.1117/12.2531128.

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Quidant, Romain, Pau Mestres, Francesco Ricci und Raul Rica. „Nano-optomechanics with a levitated nanoparticle (Conference Presentation)“. In Optical Trapping and Optical Micromanipulation XIII, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2016. http://dx.doi.org/10.1117/12.2238899.

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St. John, Demi, Philip J. T. Woodburn, David P. Atherton, Charles W. Thiel, Zeb Barber und Wm Randall Babbitt. „Solid-state laser cooling of optically levitated particles“. In Optical Trapping and Optical Micromanipulation XV, herausgegeben von Kishan Dholakia und Gabriel C. Spalding. SPIE, 2018. http://dx.doi.org/10.1117/12.2321194.

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Davis, E. J. „Optical measurements of electrodynamically levitated microparticles“. In Optics, Electro-Optics, and Laser Applications in Science and Engineering, herausgegeben von Bryan L. Fearey. SPIE, 1991. http://dx.doi.org/10.1117/12.44246.

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