Theoretical investigation of three-dimensional quasi-phase-matching photonic structures

Pogosian, Tamara; Lai, Ngoc Diep

doi:10.1103/physreva.94.063821

Cited by 18 publications

(17 citation statements)

References 40 publications

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“…Attempts to explore the connections between µ, Σ and the EFT approach in Horndeski-like theories have used very general parameterizations: connecting theoretical viability conditions of the theory with the behavior of µ, η [225], including the case with α T = 0 to address the impact of the GW speed measurement [226]. General properties of Horndeski theories could be inferred from detailed measurements of µ, Σ [227]. Similarly to the EFT approach, the background evolution is unknown and the equation of state (17) is in principle arbitrary.…”

Section: Modified Gravitational "Constants"mentioning

confidence: 99%

Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy

Ezquiaga

Zumalacárregui

2018

Front. Astron. Space Sci.

209

202

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Gravitational waves (GWs) provide a new tool to probe the nature of dark energy (DE) and the fundamental properties of gravity. We review the different ways in which GWs can be used to test gravity and models for late-time cosmic acceleration. Lagrangian-based gravitational theories beyond general relativity (GR) are classified into those breaking fundamental assumptions, containing additional fields and massive graviton(s). In addition to Lagrangian based theories we present the effective theory of DE and the µ-Σ parametrization as general descriptions of cosmological gravity. Multi-messenger GW detections can be used to measure the cosmological expansion (standard sirens), providing an independent test of the DE equation of state and measuring the Hubble parameter. Several key tests of gravity involve the cosmological propagation of GWs, including anomalous GW speed, massive graviton excitations, Lorentz violating dispersion relation, modified GW luminosity distance and additional polarizations, which may also induce GW oscillations. We summarize present constraints and their impact on DE models, including those arising from the binary neutron star merger GW170817. Upgrades of LIGO-Virgo detectors to design sensitivity and the next generation facilities such as LISA or Einstein Telescope will significantly improve these constraints in the next two decades.

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Section: Modified Gravitational "Constants"mentioning

confidence: 99%

Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy

Ezquiaga

Zumalacárregui

2018

Front. Astron. Space Sci.

209

202

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“…where hi, i = 1, · · · 5 are functions of time and assembled from the 4 αX parameters from equations 18; thus constraints on the quasi-static parameters lead to constraints on slices of the functional space of free parameters, αX . And vice versa, by restricting one self to scalar tensor theories, one can establish a restricted set of priors on µ, γ or Σ (Pogosian & Silvestri 2016;Peirone et al 2018) 3.7. The phenomenology of modified gravity.…”

Section: General Theories Of Gravity On Cosmological Scalesmentioning

confidence: 99%

Cosmological Tests of Gravity

Ferreira

2019

Annu. Rev. Astron. Astrophys.

180

125

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Cosmological observations are beginning to reach a level of precision that allows us to test some of the most fundamental assumptions in our working model of the Universe. One such as assumption is that gravity is governed by the General Theory of Relativity. In this review we discuss how one might go about extending General Relativity and how such extensions can be described in a unified way on large scales. This allows us to describe the phenomenology of modified gravity in the growth and morphology of the large scale structure of the Universe. On smaller scales we explore the physics of gravitational screening and how it might manifest itself in galaxies, clusters and, more generally, in the cosmic web. We then analyse the current constraints from large scale structure and conclude by discussing the future prospects of the field in light of the plethora of surveys currently being planned.The key results are: www.annualreviews.org • Cosmological Gravity 7

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“…However, in this traditional approach for the formation of NPCs the nonlinearity modulation is restricted to a single transverse plane. The ability to modulate χ (2) along the third orthogonal direction is highly sought after and it has been theoretically shown the a 3D modulation would greatly enhance the role of NPCs in many applications including wavefront shaping 23–28 . As displayed in Fig.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear wavefront shaping with optically induced three-dimensional nonlinear photonic crystals

Liu¹,

Switkowski²,

Xu³

et al. 2019

Nat Commun

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Generation of coherent light with desirable amplitude and phase profiles throughout the optical spectrum is a key issue in optical technologies. Nonlinear wavefront shaping offers an exceptional way to achieve this goal by converting an incident light beam into the beam (or beams) of different frequency with spatially modulated amplitude and phase. The realization of such frequency conversion and shaping processes critically depends on the matching of phase velocities of interacting waves, for which nonlinear photonic crystals (NPCs) with spatially modulated quadratic nonlinearity have shown great potential. Here, we present the first experimental demonstration of nonlinear wavefront shaping with three-dimensional (3D) NPCs formed by ultrafast-light-induced ferroelectric domain inversion approach. Compared with those previously used low-dimensional structures, 3D NPCs provide all spatial degrees of freedom for the compensation of phase mismatch in nonlinear interactions and thereby constitute an unprecedented system for the generation and control of coherent light at new frequencies.

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Theoretical investigation of three-dimensional quasi-phase-matching photonic structures

Cited by 18 publications

References 40 publications

Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy

Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy

Cosmological Tests of Gravity

Nonlinear wavefront shaping with optically induced three-dimensional nonlinear photonic crystals

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