A quantitative analysis of optical fields is essential, particularly when the light structured in some desired manner, or there perhaps an undesired structure that must be corrected for. ubiquitous procedure community mode projections-a modal light-for unveiling amplitude and phase information a field. When correctly performed, all salient features field can deduced with high fidelity, including its orbital angular momentum, vectorial properties, wavefront, Poynting vector. Here, we present...

Digital micromirror devices (DMDs) have become ubiquitous as spatial light modulators in the optics community, but ambiguity remains on how best to implement them a laboratory environment. Here, we explicitly tackle problem of generating high fidelity modes structured while maintaining optical efficiency. We present theoretical characterization diffractive properties DMD, allowing us motivate an alignment procedure that improves also set practice recommendations cover aspects DMD operation...

Abstract Quantum secret sharing is the art of securely information between more than two people in such a way that its reconstruction requires collaboration certain number parties. Here, by taking advantage high‐dimensional Hilbert space for orbital angular momentum and using Perfect Vortex beams as their carriers, proof‐of‐principle implementation quantum scheme presented. This experimentally implemented with fidelity 93.4%, 10 participants dimensions—the highest dimensions to date. The can...

Spatial light modulators (SLMs) are popular tools for generating structured fields and have fostered numerous applications in optics photonics. Here, we explore the limits of what these devices capable detecting context so-called vortex beams carrying orbital angular momentum (OAM). Our main contributions to quantify (theoretically experimentally) how pixelation SLM screen affects quality generated mode offer useful heuristics on optimise performance displayed digital hologram. In so doing,...

Secret sharing allows three or more parties to share secret information which can only be decrypted through collaboration. It complements quantum key distribution as a valuable resource for securely distributing information. Here we take advantage of hybrid spin and orbital angular momentum states access high dimensional encoding space, demonstrating protocol that is easily scalable in both dimension participants. To illustrate the versatility our approach, first demonstrate two dimensions,...

Perfect (optical) vortex (PV) beams are fields which mooted to be independent of the orbital angular momentum (OAM) they carry. To date, best experimental approximation these modes is obtained from passing Bessel-Gaussian through a Fourier lens. However, OAM-dependent width quasi-PVs not precisely known and often understated. We address this here by deriving experimentally confirming an explicit analytic expression for second moment quasi-PVs. show that scales in proportion $\sqrt{\ell}$...

We introduce a flexible microscale all-fiber-optic Raman probe which can be embedded into devices to enable operando in situ spectroscopy. The facile-constructed is composed of nested antiresonant nodeless hollow-core fiber combined with an integrated high refractive index barium titanate microlens. Pump laser 785 nm excitation and near-infrared collection are independently characterized, demonstrating spot full-width-half-maximum 1.1 μm. Since this much smaller than the effective area, it...

Reducing the time necessary to acquire information is highly desirable in almost every context. Ghost imaging no exception, which very consuming due its scanning nature and low light levels innate quantum experiments. This work aimed reduce required reconstruct image whilst maintaining quality. In doing so, we followed two complementary approaches: one varying experimental parameters, another implementing computational processing. We defined a performance measure based on reconstruction...

Perfect (optical) vortices (PVs) have the mooted ability to encode orbital angular momentum (OAM) onto field within a well-defined annular ring. Although this makes near-field radial profile independent of OAM, far-field nevertheless scales with forming Bessel structure. As yet, quantitative measurement OAM PVs has been elusive, current detection protocols opting for more qualitative procedures using interference or mode sorters. Here, we show that content PV can be measured quantitatively...

In this paper, we propose a predictor or indicator of the self-healing ability coherent structured light beams: field's modal content. Specifically, fidelity between obstructed and unobstructed beams' spectrum serves as useful measure degree to which beam will likely self-heal after an arbitrary obstacle. Since any optical field can be decomposed in terms chosen orthonormal basis, analysis is, therefore, less restrictive than other methods for determining ability. Furthermore, since content...

Control of orbital angular momentum (OAM) in optical fields has seen tremendous growth late, with a myriad tools existing for their creation and detection. What been lacking is the ability to arbitrarily modify OAM spectrum superposition amplitude phase, especially if priori knowledge initial absent. Motivated by quasi-mapping that exists between position Laguerre-Gaussian modes, we propose an approach single-step modulation field's spectrum. We outline concept implement it through use...

Hollow-core photonic crystal fibers (HC-PCFs) provide a novel approach for in situ UV/Vis spectroscopy with enhanced detection sensitivity. Here, we demonstrate that longer optical path lengths than afforded by conventional cuvette-based can be used to detect and identify the Co

Spatial filtering is a commonly deployed technique to improve the quality of laser beams by optically noise. In "textbook" example, noise usually assumed be high frequency and beam, Gaussian. this case, achieved simple pin-hole placed at common focal plane two lenses. Here, we explain how generalize concept spatial arbitrary beam profiles: structured light. We show construct filters using range light examples, highlight under what conditions works. process, address some misconceptions in...

A general method is presented for exciting discrete modes in waveguides of arbitrary geometry. Guided supported by the waveguide are first calculated using a finite difference frequency domain model. High efficiency holograms to excite these then generated Direct Search hologram generation algorithm. The algorithm optimised such that inherent properties exploited give faster execution times. nodeless antiresonant photonic crystal fibre considered as test geometry, which high-purity...

We present an approach to filter amplitude noise from arbitrary beam profiles. This work forms a tutorial on Fourier optics by enhancing the textbook case of Gaussian beams more interesting cases structured light.

Perfect (optical) vortices (PVs) have attracted significant interest in the optical community owing to their well-defined annular ring whose near-field radial profile is independent of orbital angular momentum (OAM). Although it a general belief that not possible perform quantitative OAM measurement PVs by modal decomposition, here we show, both theoretically and experimentally, content PV can be measured quantitatively near- far-fields, including superpositions within one perfect vortex....

Quantum secret sharing allows the dissemination of private information amongst many participants with unconditional security. In article number 2000012, Jonathan Pinnell and co-workers devise experimentally realize a scalable 11-dimensional implementation single photon scheme 10 participants: highest dimension achieved to date. Their work brings quantum communication across network nodes closer fruition.

Digital micro-mirror devices (DMDs) have emerged as a cost-effective and flexible alternative to traditional approaches for light control, such spatial modulators, diffractive optics metamaterials. We will outline key aspects of their operation, recent progress on how effectively use them create detect exotic states (particularly arbitrary vector beams) mimic turbulence.

We present an approach to filter amplitude noise from arbitrary beam profiles. This work forms a tutorial on Fourier optics by enhancing the textbook case of Gaussian beams more interesting cases structured light.

Secret sharing is the art of securely information between more than two people in such a way that its reconstruction requires collaboration certain number parties. Entanglement-based secret schemes which utilise multi-particle entanglement are limited by their scalability. Recently, high-dimensional single photon protocol was proposed has impressive advantages However, experimental realisation this remains elusive. Here, taking advantage Hilbert space for orbital angular momentum and using...

This Conference Presentation, "Perfect vortex beams and their applications in classical quantum information processing," was recorded at Photonics West 2020 held San Francisco, California, United States.

This Conference Presentation, “What is the maximum accessible OAM from spatial light modulators?” was recorded at Photonics West LASE 2020, held in San Francisco, California, USA.

Quantum secret sharing (QSS) is a cryptographic multiparty communication technique in which divided and shared among N parties then securely reconstructed by (N-1) cooperating parties, making it perfect for storing highly sensitive data. Challenges high dimensional state preparation, transformation detection, the key steps of any QSS protocol, have so far hindered experimental realisation. Here, taking advantage high-dimensional encoding space accessible photon's orbital angular momentum, we...