Interference-free superposition of nonzero order light modes: Functionalized optical landscapes

Čižmár, Tomáš; Dalgarno, H. I. C.; Ashok, P.; Gunn-Moore, Frank J.; Dholakia, Kishan

doi:10.1063/1.3552202

Cited by 10 publications

(6 citation statements)

References 20 publications

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“…2 θ A(θ)e iϕ x (θ) B(θ)e iϕ y (θ) [17,[43][44][45][46][47][48][49][50][51], deformable mirrors (DMs) [51], q-plate cells [52][53][54][55] and metasurfaces [56], and spiral phase plates (SPPs) [22]. Those optical elements can change the phase distribution of a mode, where the SLM and DM are programmable and can control the phase dynamically.…”

Section: Methods For Generation Of Tunable Oammentioning

confidence: 99%

“…The first kind of generation method is shown in Figure 6, which obtains tunable OAM modes by changing the phase information imposed on the SLMs, DMs or q-plate cells. When a Gaussian beam with linear polarization is launched to a programmable phase element (SLM or DM), the topological charge can be tuned by electrically changing the phase information loaded on them, which can obtain the modes on the orbital PS, as shown the first row in Figure 6 [17,[43][44][45][46]52]. The second row of Figure 6b shows 3 sections as subsystems to control respectively three degrees of freedom in the optical field, e.g., the phase, amplitude and retardation between the x and y components [47,48].…”

Section: Methods For Generation Of Tunable Oammentioning

confidence: 99%

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A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

Feng

et al. 2019

Applied Sciences

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Orbital angular momentum (OAM) beams, a new fundamental degree of freedom, have excited a great diversity of interest due to a variety of emerging applications. The scalability of OAM has always been a topic of discussion because it plays an important role in many applications, such as expanding to large capacity and adjusting the trapped particle rotation speed. Thus, the generation of arbitrary tunable OAM mode has been paid increasing attention. In this paper, the basic concepts of classical OAM modes are introduced firstly. Then, the tunable OAM modes are categorized into three types according to the orbital angular momentums and polarization states of mode carrying. In order to understand the OAM evolution of a mode intuitively, three kinds of Poincaré spheres (PSs) are introduced to represent the three kinds of tunable OAM modes. Numerous methods generating tunable OAM modes can be roughly divided into two types: spatial and fiber-based generation methods. The principles of fiber-based generation methods are interpreted by introducing two mode bases (linearly-polarized modes and vector modes) of the fiber. Finally, the strengths and weaknesses of each generation method are pointed out and the key challenges for tunable OAM modes are discussed.

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Section: Methods For Generation Of Tunable Oammentioning

confidence: 99%

Section: Methods For Generation Of Tunable Oammentioning

confidence: 99%

A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

Feng

et al. 2019

Applied Sciences

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“…optical vortex beams). The experimental verification of the transfer of angular momentum upon a particle has been demonstrated by rotation of an absorbing particle in the dark center of the vortex beam [36,37] or orbiting of microparticles around the beam axis in the high-intensity ring of the vortex beam [19,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Even though in these cases the sizes of such particles were comparable to the laser beam wavelength, no quantitative comparison between the theory and the experiment has been performed.…”

Section: Introductionmentioning

confidence: 99%

Optical forces induced behavior of a particle in a non-diffracting vortex beam

Šiler¹,

Jákl²,

Brzobohatý³

et al. 2012

Opt. Express

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An interaction between a light field with complex field spatial distribution and a micro-particle leads to forces that drag the particle in space and may confine it in a stable position or a trajectory. The particle behavior is determined by its size with respect to the characteristic length of the spatially periodic or symmetric light field distribution. We study theoretically and experimentally the behavior of a microparticle near the center of an optical vortex beam in a plane perpendicular to the beam propagation. We show that such particle may be stably trapped either in a dark spot on the vortex beam axis, or in one of two points placed off the optical axis. It may also circulate along a trajectory having its radius smaller or equal to the radius of the first bright vortex ring.

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“…Both technologies were developed in parallel in the branch of optical manipulation, but only recently, they were combined into more powerful tandem system that immediately manifested itself as an extraordinary optical tool allowing fast and complex beam-shaping. 17,18 We now show how to utilize this assembly to enhance the speed of the fibre-based fluorescent imaging by two orders of magnitude.…”

Section: +++4+++ ++I+t++mentioning

confidence: 99%

Exploiting multimode waveguides for pure fibre based fluorescence imaging

Čižmár¹,

Dholakia

2013

SPIE Proceedings

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There has been an immense drive in modern microscopy towards miniaturisation and fibre based technology. This has been necessitated by the need to access hostile or difficult environments particulalrly in-situ and in-vivo. Strategies to date have included the use of specialist fibres and miniaturised scanning systems accompanied by ingenious microfabricated lenses. In parallel recent studies of randomized light fields and their holographic control opened up new ways for imaging. We present a novel approach for this field by utilising disordered light within a standard multimode optical fibre for minimally invasive lensless microscopy and optical mode conversion. We demonstrate scanning fluorescence microscopy at acquisition rates allowing observation of dynamic processes such as Brownian motion of mesoscopic particles. As the sample plane can be defined at any distance from the fibre facet, we eliminate the need for complex or elaborate focusing optics (e.g. miniaturized objectives, GRIN lenses) and instead reconfigure the system dynamically to image different axial planes. Furthermore, we show how such control can realise a new form of mode converter and generate various types of advanced light fields such as propagation-invariant beams and optical vortices. These may be useful for future fibre based implementations of super-resolution or light sheet microscopy. To the best of our knowledge, this technology represents the narrowest possible image guiding system based on light propagation.

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Interference-free superposition of nonzero order light modes: Functionalized optical landscapes

Cited by 10 publications

References 20 publications

A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

Optical forces induced behavior of a particle in a non-diffracting vortex beam

Exploiting multimode waveguides for pure fibre based fluorescence imaging

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