Dynamic axial stabilization of counter-propagating beam-traps with feedback control

Tauro, Sandeep; Bañas, Andrew Rafael; Palima, Darwin; Glückstad, Jesper

doi:10.1364/oe.18.018217

Cited by 41 publications

(39 citation statements)

References 21 publications

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“…A hollow core waveguide can be even more universal: it can confine both the particle and optical radiation to achieve higher energy and momentum densities [71], also representing an innovation in light delivery. In principle, the feedback control module involves working with the different components simultaneously (e.g., particle position detection is used in feedback-based control of light modulation to improve optical manipulation [72]). …”

Section: Experimental Geometries and Strategiesmentioning

confidence: 99%

Engineering light-matter interaction for emerging optical manipulation applications

et al. 2014

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Abstract:In this review, we explore recent trends in optical micromanipulation by engineering light-matter interaction and controlling the mechanical effects of optical fields. One central theme is exploring the rich phenomena beyond the now established precision measurements based on trapping micro beads with tightly focused beams. Novel synthesized beams, exploiting the linear and angular momentum of light, open new possibilities in optical trapping and micromanipulation. Similarly, novel structures are promising to enable new optical micromanipulation modalities. Moreover, an overview of the amazing features of the optics of tractor beams and backward-directed energy fluxes will be presented. Recently the so-called effect of negative propagation of the beams (existence of the backward energy fluxes) has been confirmed for X-waves and Airy beams. In the review, we will also discuss the negative pulling force of structured beams and negative energy fluxes in the vicinity of fibers. The effect is achieved due to the interaction of multipoles or, in another interpretation, the momentum conservation. Both backward-directed Poynting vector and backward optical forces are counter-intuitive and give an insight into new physics and technologies. Exploiting the degrees of freedom in synthesizing novel beams and designed microstructures offer attractive prospects for emerging optical manipulation applications.

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Section: Experimental Geometries and Strategiesmentioning

confidence: 99%

Engineering light-matter interaction for emerging optical manipulation applications

et al. 2014

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“…Until today, with the constant improvements and increasing use of processing hardware and image recognition algorithms, and with the increasing amount of calibration image data, machine vision is actively used in diverse fields such as gaming and computing, unmanned vehicles, and person identification. Applied to optical manipulation, we use machine vision to locate cells that deviate from normal healthy ones and then activate optical traps based on the cell's position enabling automated manipulation 7 or dynamic stabilization 8 . Our cell sorting platform, the Bio-Optofluidic Cell Sorter 9 (cell-BOCS), is therefore designed to utilize machine vision to search for abnormalities in cells.…”

Section: Introductionmentioning

confidence: 99%

Optical cell sorting with multiple imaging modalities

Bañas¹,

Carrissemoux

Villangca³

et al. 2017

SPIE Proceedings

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Early detection of diseases can save lives. Hence, there is emphasis in sorting rare disease-indicating cells within small dilute quantities such as in the confines of lab-on-a-chip devices. However, before diseased cells can be studied in isolation, it is necessary to identify them against normal healthy cells. With the richness of visual information, a lot of microscopy techniques have been developed and have been crucial in biological studies. To utilize their complementary advantages we adopt both fluorescence and brightfield imaging in our optical cell sorter. Brightfield imaging has the advantage of being non-invasive, thus maintaining cell viability. Fluorescence imaging, on the other hand, takes advantages of the chemical specificity of fluorescence markers and can validate machine vision results from brightfield images. Visually identified cells are sorted using optical manipulation techniques. Scattering forces from beams actuated via efficient phase-only efficient modulation has been adopted. This has lowered the required power for sorting cells to a tenth of our previous approach, and also makes the cell sorter safer for use in clinical settings. With the versatility of dynamically programmable phase spatial light modulators, a plurality of light shaping techniques, including hybrid approaches, can be utilized in cell sorting.

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“…Unlike speckled or discontinuous patterns, light distributions with contiguous intensity and phase remain localized while propagating enabling extended optical manipulation [1,22,24]. Instead of a focusing geometry, GPC uses an imaging geometry, hence avoiding dispersion effects which makes it advantageous for use with multiple wavelengths [25] or temporal focusing [2,3].…”

Section: Introductionmentioning

confidence: 99%

GPC light shaper for speckle-free one- and two-photon contiguous pattern excitation

Bañas¹,

Palima²,

Villangca³

et al. 2014

Opt. Express

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Generalized Phase Contrast (GPC) is an efficient method for generating speckle-free contiguous optical distributions useful in diverse applications such as static beam shaping, optical manipulation and recently, for excitation in two-photon optogenetics. To fully utilize typical Gaussian lasers in such applications, we analytically derive conditions for photon efficient light shaping with GPC. When combined with the conditions for optimal contrast developed in previous works, our analysis further simplifies GPC's implementation. The results of our analysis are applied to practical illumination shapes, such as a circle and different rectangles commonly used in industrial or commercial applications. We also show simple and efficient beam shaping of arbitrary shapes geared towards biophotonics research and other contemporary applications. Optimized GPC configurations consistently give ~84% efficiency and ~3x intensity gain. Assessment of the energy savings when comparing to conventional amplitude masking show that ~93% of typical energy losses are saved with optimized GPC configurations.

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Dynamic axial stabilization of counter-propagating beam-traps with feedback control

Cited by 41 publications

References 21 publications

Engineering light-matter interaction for emerging optical manipulation applications

Engineering light-matter interaction for emerging optical manipulation applications

Optical cell sorting with multiple imaging modalities

GPC light shaper for speckle-free one- and two-photon contiguous pattern excitation

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