Applications of Laser Radiation Pressure

Ashkin, A.

doi:10.1126/science.210.4474.1081

Cited by 576 publications

(290 citation statements)

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“…spectroscopy [15,16]), the laser soon became a tool to actively manipulate and control atomic-scale matter. The work of Ashkin and colleagues in the 1970's [17,18] showed that the radiation pressure from a focused laser beam could be used to trap and move small (wavelength-scale) electrically neutral particles 1.2 . Closely related techniques to cool and eventually stop atoms were proposed [21,22], and demonstrated [23] in the same decade.…”

Section: Precise Position Measurementsmentioning

confidence: 99%

“…However due to their small transverse dimensions (∼ 10 − 100 nm), the nanobeam geometry does not have a large cross-section for electromagnetic scattering, making them not susceptible to scattering type [18] radiation pressure forces. Therefore, their interaction with optical cavity fields is mediated by gradient type forces [49,227,[229][230][231][232].…”

Section: Stressed Nanostring Coupled To An Optical Microcavitymentioning

confidence: 99%

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Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

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PAR Vivishek SUDHIR JOSEPH CONRAD, Heart of DarknessExperimental physics demands a certain degree of manual dexterity, the patience to tolerate the mundane, and an inexhaustible supply of optimism. Tobias hired me to work on an immensely sophisticated experiment despite any proof of my possessing these qualities; I am indebted to him for the belief he has placed in me. I would also like to acknowledge his dedication to fostering an environment where the pursuit of science is unencumbered by other worldly concerns. Stefan, Ewold and Samuel bore the brunt of a theorist trying to perform delicate experiments; the stern, yet encouraging, stewardship of this trio ensured that I enjoyed the culture shock. Dal Wilson was more than a colleague and a post-doc; his pragmatic approach to physics provided the ideal counter-point in our attempts to forge a deeper understanding of things ranging from vibration isolation to the subtleties of quantum mechanics. Without the patient efforts of Amir, Ryan and Hendrik in designing, fabricating, and testing of devices, none of the results reported here would have been possible. I hope I have been able to bequeath a better vision of the future of our experiment to Sergey. Conversations with Alexey, Daniel and Nathan have enabled me to vicariously learn how to measure microwave "photons". John Jost once taught me how to decorate a Christmas tree; since then he has imparted some wisdom on frequency metrology, and some on atomic physics. Together with Dal, Victor and Caroline have probably spent the most time with me outside the lab; it was fun to exercise an air of social normalcy with this bunch. Christophe has been an amazing sparring partner on every subject capable of being brought under scientific scrutiny.The personal space required for the pursuit of science comes through the sacrifice of many people. My family back home in India -parents, sister, grand-parents -have had to patiently wait for the brief interludes when I go home. No words can do justice to this and the very many other pleasures they have surrendered over the years for my sake. Before physics attracted me, I was charmed by someone else; I am lucky to have married her. Long time friends, mentorsAjith and Subeesh -have played pivotal roles in my being able to engage in physics; I hope to repay this enormous debt, some day.It was a privilege to have learnt from a few great teachers during my formative years. Their vision of an indelible unity in nature continues to motivate my study of physics. vii AbstractThe precision measurement of position has a long-standing tradition in physics. Cavendish's verification of the universal law of gravitation using a torsion pendulum, Perrin's confirmation of the atomic hypothesis via the precise measurement of the Brownian motion, and, the verification of the mechanical effect of electromagnetic radiation, all belong to this classical heritage. Quantum mechanics posits that the measurement of position results in an uncertain momentum; an idea developed to full maturity within the ...

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Section: Precise Position Measurementsmentioning

confidence: 99%

Section: Stressed Nanostring Coupled To An Optical Microcavitymentioning

confidence: 99%

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

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“…Lower strain (<10% deformation) methods including optical stretchers (7,32) can apply non-destructive, non-contact forces sufficient to differentiate cell states (9,33,34). Optical stretching relies on the changing momentum of laser light by refraction at the surface of a soft dielectric object, generating non-contact optical forces (35). In specific laser configurations (36,37) and when operated at powers that minimize heating from optical absorption (38,39), these forces can deform trapped cells.…”

Section: Introductionmentioning

confidence: 99%

High‐throughput linear optical stretcher for mechanical characterization of blood cells

et al. 2015

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This study describes a linear optical stretcher as a high-throughput mechanical property cytometer. Custom, inexpensive, and scalable optics image a linear diode bar source into a microfluidic channel, where cells are hydrodynamically focused into the optical stretcher. Upon entering the stretching region, antipodal optical forces generated by the refraction of tightly focused laser light at the cell membrane deform each cell in flow. Each cell relaxes as it flows out of the trap and is compared to the stretched state to determine deformation. The deformation response of untreated red blood cells and neutrophils were compared to chemically treated cells. Statistically significant differences were observed between normal, diamide-treated, and glutaraldehyde-treated red blood cells, as well as between normal and cytochalasin D-treated neutrophils. Based on the behavior of the pure, untreated populations of red cells and neutrophils, a mixed population of these cells was tested and the discrete populations were identified by deformability. V C 2015 International Society for Advancement of Cytometry

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“…Optical tweezers have been widely used for manipulation of micro-or nano-size particles for physical, chemical, and or biological characterization [33][34][35]. The opticaltweezers technique is often combined with another technique, e.g., Raman spectroscopy, to make optical tweezersRaman spectroscopy, to further broaden its application in many research fields [36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Photophoretic trapping-Raman spectroscopy for single pollens and fungal spores trapped in air

Wang

Pan

Hill

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tPhotophoretic trapping-Raman spectroscopy (PTRS) is a new technique for measuring Raman spectra of particles that are held in air using photophoretic forces. It was initially demonstrated with Raman spectra of strongly-absorbing carbon nanoparticles (Pan et al.[44] (Opt Express 2012)). In the present paper we report the first demonstration of the use of PTRS to measure Raman spectra of absorbing and weakly-absorbing bioaerosol particles (pollens and spores). Raman spectra of three pollens and one smut spore in a size range of 6.2-41.8 mm illuminated at 488 nm are shown. Quality spectra were obtained in the Raman shift range of 1600-3400 cm À 1 in this exploratory study. Distinguishable Raman scattering signals with one or a few clear Raman peaks for all four aerosol particles were observed within the wavenumber region 2940-3030 cm À 1 . Peaks in this region are consistent with previous reports of Raman peaks in the 1600-3400 cm À 1 range for pollens and spores excited at 514 nm measured by a conventional Raman spectrometer. Noise in the spectra, the fluorescence background, and the weak Raman signals in most of the 1600-3400 cm À 1 region make some of the spectral features barely discernable or not discernable for these bioaerosols except the strong signal within 2940-3030 cm À 1 . Up to five bands are identified in the three pollens and only two bands appear in the fungal spore, but this may be because the fungal spore is so much smaller than any of the pollens. The fungal spore signal relative to the air-nitrogen Raman band is approximately 10 times smaller than that ratio for the pollens. The five bands are tentatively assigned to the CH 2 symmetric stretch at 2948 cm À 1 , CH 2 Fermi resonance stretch at 2970 cm À 1 , CH 3 symmetric stretch at 2990 cm À 1 , CH 3 out-of-plane end asymmetric stretch at 3010 cm À 1 , and unsaturated ¼ CH stretch at 3028 cm À 1 . The two dominant bands of the up-to-five Raman bands in the 2940-3030 cm À 1 region have a consistent band spacing of 25 cm À 1 in all four aerosols. Finally we discuss improvements to the PTRS that should provide a system which can trap a higher fraction of particle types and obtain Raman spectra over a larger range (e.g., 200-3600 cm À 1 ) than those achieved here.Published by Elsevier Ltd.

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Applications of Laser Radiation Pressure

Cited by 576 publications

References 51 publications

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Quantum Limits on Measurement and Control of a Mechanical Oscillator

High‐throughput linear optical stretcher for mechanical characterization of blood cells

Photophoretic trapping-Raman spectroscopy for single pollens and fungal spores trapped in air

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