Comment on “Low-Power Laser Deformation of an Air-Liquid Interface”

Verma, Gopal; Nair, James; Singh, Kanwarpal

doi:10.1103/physrevlett.110.079401

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…The enhancement in κ near the critical angle was due to increase in the reflection coefficient of the interface thus enhancing the momentum transfer to the interface. Our data did not agree with previous claim of a dimple with low-power laser 22 23 24 25 26 , but agreed with the pump-probe measurement of a long-range bump on the sessile water drop 14 .…”

Section: Resultscontrasting

confidence: 99%

Nanomechanical effects of light unveil photons momentum in medium

Verma

Chaudhary

Singh

2017

Sci Rep

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Precision measurement on momentum transfer between light and fluid interface has many implications including resolving the intriguing nature of photons momentum in a medium. For example, the existence of Abraham pressure of light under specific experimental configuration and the predictions of Chau-Amperian formalism of optical momentum for TE and TM polarizations remain untested. Here, we quantitatively and cleanly measure nanomehanical dynamics of water surface excited by radiation pressure of a laser beam. We systematically scanned wide range of experimental parameters including long exposure times, angle of incidence, spot size and laser polarization, and used two independent pump-probe techniques to validate a nano- bump on the water surface under all the tested conditions, in quantitative agreement with the Minkowski’s momentum of light. With careful experiments, we demonstrate advantages and limitations of nanometer resolved optical probing techniques and narrow down actual manifestation of optical momentum in a medium.

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Section: Resultscontrasting

confidence: 99%

Nanomechanical effects of light unveil photons momentum in medium

Verma

Chaudhary

Singh

2017

Sci Rep

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“…However, in this case the authors explained the effect in terms of the Goos-Hänchen shift of the totally reflected beam and the gradient forces existing above the interface. This interpretation was later criticized [179,180] and the results could not be reproduced in the subsequent experiments [181]. A consolidated model of the light interaction with interfaces based on the basic electrodynamic postulates has yet to be developed.…”

Section: Optomechanical Effects In the Vicinity Of Interfacesmentioning

confidence: 99%

Non-conservative optical forces

Sukhov

Dogariu

2017

Rep. Prog. Phys.

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Undoubtedly, laser tweezers are the most recognized application of optically induced mechanical action. Their operation is usually described in terms of conservative forces originating from intensity gradients. However, the fundamental optical action on matter is non-conservative. We will review different manifestations of non-conservative optical forces (NCF) and discuss their dependence on the specific spatial properties of optical fields that generate them. New developments relevant to the NCF such as tractor beams and transversal forces are also discussed.

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“…It should be possible to improve the resolution in sub-nm regime employing lock-in detection for modulated intensity. Due to high sensitivity, simplicity, and time-resolution, this optical technique could find diverse applications in precision measurements on evaporation of fluid mixtures [22] fast shape-oscillations induced by external fields (electromagnetic, acoustic) [23] and in optofluidics [24,25].…”

Section: Introductionmentioning

confidence: 99%

Optical detection of nanometric surface dynamics of an evaporating sessile droplet

Verma

Singh

2014

12th International Conference on Fiber Optics and Photonics

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We propose a simple optical technique to measure time-resolved nanoscale surface profile of an evaporating sessile fluid droplet. By analyzing Newton ring like high contrast fringes we demonstrated /100≈5 nm sensitivity in surface height change of the air-water interface. This allowed us to precisely measure transient surface dynamics during the contact-line slips, weak perturbations on the evaporation due to external magnetic field and partial confinement of the drop. Further, we demonstrate wide applicability of this technique by measuring the nanoscale surface dynamics of the water drop resting on a deformable oil interface. OCIS codes: (120.6650) General; (240.6648) The evaporation of water drops is common phenomenon with many applications. It finds technological applications in printing [1, 2] cooling of electronic devices [3] and in micro-lithography on biomaterials [4]. The evaporation rate is very sensitive to small impurities in fluids, external electric and magnetic fields, as well as substrate properties [5]. Its nanoscale measurement is essential to better understand the behavior of evaporating drop in various circumstances. Previous measurements on evaporation of fluid drops employed diverse techniques such as gravimetric measurement of mass-loss using quartz crystal micro balance [6]. Raman thermometry[7] and atomic force microscopy cantilevers [8]. Various optical techniques have also been used such as microscopic imaging of the drop [9, 10] fiber-optic sensing [11] light scattering from fiber suspended drop [12] reflectometry [13] and twobeam Mach Zehnder interferometry [14]. However, few techniques offer nm resolution for in situ measurement of surface height change due to evaporation. During evaporation of a sessile drop from a solid substrate, its contact-line could slip due to imbalance of interfacial stresses. This leads to fast nanoscale surface instabilities [15,16]. Many theoretical studies exist [17,18] however, time-resolved measurements of slipping events with few nm precision have not been demonstrated yet. Moreover, measurement of surface dynamics of an evaporating drop resting on soft deformable substrate (water drop on oil) is also of great recent interest [19,20]. Therefore, a simple optical technique offering time-resolution, precision, and flexibility to probe such diverse situations is desired.In this paper, we show that by analyzing high-contrast Newton ring like fringes one can dynamically resolve nanometric surface changes in an evaporating water drop. A resolution of /100≈5 nm in its height at (0.01-160 nm/s) rate was demonstrated. This high sensitivity allowed us to measure nanoscale surface dynamics when the contact line slipped on a glass substrate [21]. Applications of the technique to measure perturbations on the evaporation rate by static magnetic field, by partial confinement of the drop, and evaporation dynamics of a water drop resting on a soft deformable substrate are demonstrated. The schematics of our experimental setup are shown in Fig. 1. Two complementary arra...

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Comment on “Low-Power Laser Deformation of an Air-Liquid Interface”

Cited by 12 publications

References 3 publications

Nanomechanical effects of light unveil photons momentum in medium

Nanomechanical effects of light unveil photons momentum in medium

Non-conservative optical forces

Optical detection of nanometric surface dynamics of an evaporating sessile droplet

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