Integrated Photonics

Pollock, Clifford R.; Lipson, Michal

doi:10.1007/978-1-4757-5522-0

Cited by 142 publications

(131 citation statements)

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“…The Y branch and multimode interference element are often used; however, these devices have large footprints and exhibit limited bandwidth, respectively. 24,25 Here, we combine properly engineered TO elements to form a new type of power splitter. As shown in Figure 5c, the TO version of the splitter is composed of three GRIN elements, each connecting to an optical waveguide.…”

Section: Methodsmentioning

confidence: 99%

“…24,25 In order to mitigate insertion loss and crosstalk at the intersections of optical waveguides, either a resonator or a mode expander type crossing device is needed. 45,46 By applying an appropriate QCTO approach to engineer the GRIN profile of the device, we design a new type of waveguide crossing that can channel the light propagation throughout the transformation medium without any wave guiding structures.…”

Section: Methodsmentioning

confidence: 99%

“…There has been a growing interest in the development of more complex onchip systems by integrating miniaturized photonic devices of high functionality on a common substrate. 24,25 Besides conventional devices with dielectric waveguides as key elements, engineered structures including photonic crystals and metamaterials can be employed to develop optical integrated devices or nanocircuits. [26][27][28] Here, we introduce the concept of a new type of photonic integrated circuit, as shown in Figure 1, which consists of QCTO elements that can perform a variety of functions, such as light collimation, bending and coupling.…”

Section: Introductionmentioning

confidence: 99%

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Integrated photonic systems based on transformation optics enabled gradient index devices

Turpin

Werner

2012

Light Sci Appl

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Integrated photonics is expected to play an increasingly important role in optical communications, imaging, computing and sensing with the promise for significant reduction in the cost and weight of these systems. Future advancement of this technology is critically dependent on an ability to develop compact and reliable optical components and facilitate their integration on a common substrate. Here we reveal, with the utility of the emerging transformation optics technique, that functional components composed of planar gradient index materials can be designed and readily integrated into photonic circuits. The unprecedented design flexibility of transformation optics allows for the creation of a number of novel devices, such as a light source collimator, waveguide adapters and a waveguide crossing, which have broad applications in integrated photonic chips and are compatible with current fabrication technology. Using the finite-difference time-domain method, we perform full-wave numerical simulations to demonstrate their superior optical performance and efficient integration with other components in an on-chip photonic system. These components only require spatially-varying dielectric materials with no magnetic properties, facilitating low-loss, broadband operation in an integrated photonic environment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated photonic systems based on transformation optics enabled gradient index devices

Turpin

Werner

2012

Light Sci Appl

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“…It is intended for silicon with a refractive index of n ¼ 3.2 surrounded by air demonstrating wave propagation. See Pollock and Lipson (2003) and continuative reference for further details. The structure is surrounded by PML with thickness l 0 /2 and truncated by homogeneous Dirichlet boundaries.…”

Section: Sharp Bend Examplementioning

confidence: 99%

Comparison ofhp‐adaptive methods in finite element electromagnetic wave propagation

Schober

Kasper

2007

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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For AuthorsIf you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.*Related content and download information correct at time of download. Purpose -This paper aims to show that simple geometry-based hp-algorithms using an explicit a posteriori error estimator are efficient in wave propagation computation of complex structures containing geometric singularities. Design/methodology/approach -Four different hp-algorithms are compared with common h-and p-adaptation in electrostatic and time-harmonic problems regarding efficiency in number of degrees of freedom and runtime. An explicit a posteriori error estimator in energy norm is used for adaptive algorithms.Findings -Residual-based error estimation is sufficient to control the adaptation process. A geometry-based hp-algorithm produces the smallest number of degrees of freedom and results in shortest runtime. Predicted error algorithms may choose inappropriate kind of refinement method depending on p-enrichment threshold value. Achieving exponential error convergence is sensitive to the element-wise decision on h-refinement or p-enrichment.Research limitations/implications -Initial mesh size must be sufficiently small to confine influence of phase lag error. Practical implications -Information on implementation of hp-algorithm and use of explicit error estimator in electromagnetic wave propagation is provided. Originality/value -The paper is a resource for developing efficient finite element software for high-frequency electromagnetic field computation providing guaranteed error bound.

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“…However, due to their small size and high stability integrated quantum optical systems [18] are very promising in this direction. Furthermore, they provide an attractive platform for the realization of a wide range of functionalities including quantum simulations [19,20], boson sampling [21][22][23], quantum computation, and quantum communication processing [24].…”

mentioning

confidence: 99%

Modified two-photon interference achieved by the manipulation of entanglement

et al. 2017

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In this theoretical study we demonstrate that entangled states are able to significantly extend the functionality of Hong-Ou-Mandel (HOM) interferometers. By generating a coherent superposition of parametric-down-conversion photons and spatial entanglement in the input channel, the coincidence probability measured at the output changes from a typical HOM-type dip (photon bunching) into much richer patterns including an anti-bunching peak and rapid oscillation fringes with twice the optical frequency. The considered system should be realizable on a single chip using current waveguide technology in the LiN bO3 platform. [4][5][6], and quantum algorithms [7,8]. The highly attractive hyperentangled states extend possibilities of quantum technologies, allowing new quantum communication protocols, superdense teleportation [10], and objects with higher dimensionality [9]. Therefore the generation and application of photon states with a high degree of entanglement and hyperentangled states is an intensely studied topic in quantum optics.An important element in a computational infrastructure based on photons are quantum interferometers which allow to measure the degree of indistinguishability of photons. Such interferometers can be realized using the well-known two-photon Hong-Ou-Mandel (HOM) interference, which was demonstrated in several systems [11][12][13][14][15][16][17].For practical large-scale applications in quantum information processing free-space set-ups are not very reliable because of the experimental complexity that is required to achieve and maintain a precise and stable adjustment between the elements and due to the significant size of such systems. However, due to their small size and high stability integrated quantum optical systems [18] are very promising in this direction. Furthermore, they provide an attractive platform for the realization of a wide range of functionalities including quantum simulations [19,20], boson sampling [21-23], quantum computation, and quantum communication processing [24].In this paper, we propose and analyze a device which can be realized on a single integrated platform and is able to manipulate the two-photon coincidence probability by interference and to create hyperentanglement. The photon pair generation is incorporated into the system using an on-chip parametric-down-conversion (PDC) [25][26][27][28] source. We theoretically show that the creation of spatially-entangled photons in a singlet Bell state is possible in such a device and that the entanglement leads to novel features in the coincidence probability. In particular, different regimes of bunching (HOM-type dips) and anti-bunching (singlet Bell state) and rapid interference fringes corresponding to twice the optical frequency are predicted. Simultaneously, frequency correlations are preserved in the system which leads to the creation a hyperentanglement, see Fig. 1. FIG. 1. Two photons generated in a PDC process have frequency correlations. The creation of spatial entanglement between the photons leads to a hy...

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Integrated Photonics

Cited by 142 publications

References 0 publications

Integrated photonic systems based on transformation optics enabled gradient index devices

Integrated photonic systems based on transformation optics enabled gradient index devices

Comparison ofhp‐adaptive methods in finite element electromagnetic wave propagation

Modified two-photon interference achieved by the manipulation of entanglement

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