Control and characterisation of a single aerosol droplet in a single-beam gradient-force optical trap

Hopkins, Rachel; Mitchem, Laura; Ward, Andrew D.; Reid, Jonathan P.

doi:10.1039/b414459g

Cited by 186 publications

(181 citation statements)

References 20 publications

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“…15 In the experiments reported in this article we use a superhydrophobic surface for position stabilization. In addition to preserving the sphericity of the microdroplets, the use of the superhydrophobic surface improves the robustness of the experiments against external disturbances.…”

Section: Introductionmentioning

confidence: 99%

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Kiraz

Karadağ

Muradoğlu

2008

Phys. Chem. Chem. Phys.

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Large spectral tuning of a water-glycerol microdroplet standing on a superhydrophobic surface by local heating with a focused infrared laser is studied both experimentally by optical spectroscopy and computationally using a lumped system formulation of the mass and heat transfer between the microdroplet and the chamber. The effects of optical scattering force, chamber humidity, size of microdroplet and laser power on the tuning mechanism are examined. The reversibility of the tuning mechanism is also studied. In spite of its negligibly small volatility compared to that of water, irreversibility is found to be mainly caused by evaporation of glycerol. It is also found that reversibility increases dramatically with the relative water and glycerol humidities, and spectral tuning can be made almost fully reversible when the chamber is saturated with glycerol vapor and the relative water humidity approaches unity. Some hysteresis effects are observed, especially in large microdroplets, and this behavior is attributed to the whisperinggallery mode resonances in laser absorption. The time response of the tuning mechanism is also analyzed both experimentally and computationally. The technique presented can find applications in optical communication systems, and can be used in fundamental studies in cavity quantum electrodynamics and in characterizing liquid aerosols on a surface.

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Section: Introductionmentioning

confidence: 99%

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Kiraz

Karadağ

Muradoğlu

2008

Phys. Chem. Chem. Phys.

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“…Computation is not straightforward because of both lack of material constants and complicated theory [1]. Direct measurement is not easy either -measured particle should be captured (today usually realized by optical tweezers [2] or by electrodynamic quadrupoles of various shapes [3,4]), illuminated with a laser, and the scattered light should be measured.…”

Section: Introductionmentioning

confidence: 99%

Dust grain characterization — Direct measurement of light scattering

BartoÅ¹,

PavlÅ̄²

2018

AIP Conference Proceedings

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“…1,2 Noncontact levitation of a single micrometer-sized water droplet in air can be achieved by a laser trapping technique. [3][4][5][6][7][8][9][10][11] Furthermore, a laser beam used as a trapping light source can be used simultaneously as an excitation light source for Raman spectroscopy, which provides information on a fingerprint of the chemical composition in an aerosol water droplet. Therefore, laser trapping and Raman spectroscopy is the powerful means to study the chemical and physical properties of single droplets in air.…”

Section: Introductionmentioning

confidence: 99%

Reversible Control of the Equilibrium Size of a Single Aerosol Droplet by Change in Relative Humidity

2014

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Noncontact levitation of single micrometer-sized water droplets in air can be achieved by a laser trapping technique. The equilibrium size of a water droplet is quite sensitive to relative humidity in the surrounding gas phase. In order to investigate the physical and chemical properties of single water droplets in air as a function of the droplet size or solute concentration, laser trapping experiments were conducted under controlled humidity conditions. In this study, we developed a trapping chamber equipped with a relative humidity controller and demonstrated the reversible control of the equilibrium size of a single droplet levitated in air through a change in relative humidity. Furthermore, relative humidity was successfully evaluated by means of cavity enhanced Raman spectroscopy of a trapped water droplet.

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Control and characterisation of a single aerosol droplet in a single-beam gradient-force optical trap

Cited by 186 publications

References 20 publications

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Dust grain characterization — Direct measurement of light scattering

Reversible Control of the Equilibrium Size of a Single Aerosol Droplet by Change in Relative Humidity

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