Brillouin integrated photonics

Eggleton, Benjamin J.; Poulton, Christopher G.; Rakich, Peter T.; Steel, M. J.; Bahl, Gaurav

doi:10.1038/s41566-019-0498-z

Cited by 312 publications

(228 citation statements)

References 162 publications

(233 reference statements)

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“…In conclusion, tailorable, nonlocal, nonlinear responses can be achieved by interfacing signals in different domains, coupling light and coherent long-lived acoustic waves. These interactions are useful in many practical applications, such as filtering, coherent signal addition, opto-acoustic storage and spectral analysis [15]. Further, the unique properties of the forward Brillouin process can enable applications utilizing cascaded devices for spectral awareness, channelizing and sensing.…”

Section: Discussionmentioning

confidence: 99%

“…These elastic modes can be long-lived and propagate many optical wavelengths before decaying, yielding nonlocal dynamics [11][12][13]. This acousto-optic coupling is a three-wave mixing process producing a coherent interaction of optical waves and acoustic phonons [1,14,15]. More specifically, in a forward Brillouin scattering process the optical fields are co-propagating, while the phonons produced by the scattering process are emitted perpendicular to the direction of optical wave propagation [12,13,16].…”

Section: Introductionmentioning

confidence: 99%

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Shaping nonlinear optical response using nonlocal forward Brillouin interactions

et al. 2020

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In most practical scenarios, optical susceptibilities can be treated as a local property of a medium. For example, in the context of nonlinear optics we can typically treat the Kerr and Raman response as local, such that optical fields at one location do not produce a nonlinear response at distinct locations in space. This is because the electronic and vibrational disturbances produced within the material are confined to a region that is smaller than an optical wavelength. By comparison, Brillouin interactions, mediated by traveling-wave acoustic phonons, can result in a highly nonlocal nonlinear response as the elastic waves generated in the process can occupy a region in space much larger than an optical wavelength. The unique properties of these interactions can be exploited to engineer new types of processes, where highly delocalized phonon modes serve as an engineerable channel that mediates scattering processes between light waves propagating in distinct optical waveguides. These types of nonlocal optomechanical responses have recently been demonstrated as the basis for information transduction, however the nontrivial dynamics of such systems has yet to be explored. In this work, we show that the third-order nonlinear process resulting from spatially extended Brillouin-active phonon modes involves mixing products from spatially separated, optically decoupled waveguides, yielding a nonlocal susceptibility. Building on these concepts, we illustrate how nontrivial multi-mode acoustic interference can produce a nonlocal susceptibility with a multi-pole frequency response, as the basis for new optical and microwave signal processing schemes within traveling wave systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shaping nonlinear optical response using nonlocal forward Brillouin interactions

et al. 2020

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“…Almost all conventional optical step-index waveguides are unsuitable for confining and supporting the low-loss propagation of acoustic waves. This is because the high refractive index materials making up the core of optical waveguides tend to support acoustic waves propagating at larger velocities than in the low-refractive index cladding layers [1]. Consequently, acoustic waves do not experience total internal reflection (TIR) at the core-cladding interface, and dissipate by free propagation into the cladding.…”

Section: Introductionmentioning

confidence: 99%

“…A number of designs have been put forward to address this challenge [1][2][3][4]. In some, the waveguides are suspended in air by either sparsely positioned [5][6][7] or specifically engineered supporting structures [8].…”

Section: Introductionmentioning

confidence: 99%

ARRAW: anti-resonant reflecting acoustic waveguides

Schmidt¹,

O'Brien²,

Steel³

et al. 2020

New J. Phys.

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Development of acoustic and optoacoustic on-chip technologies calls for new solutions to guiding, storing and interfacing acoustic and optical waves in integrated silicon-on-insulator systems. One of the biggest challenges in this field is to suppress the radiative dissipation of the propagating acoustic waves, while co-localizing the optical and acoustic fields in the same region of an integrated waveguide. Here we address this problem by introducing anti-resonant reflecting acoustic waveguides (ARRAWs)—mechanical analogues of the anti-resonant reflecting optical waveguides. We discuss the principles of anti-resonant guidance and establish guidelines for designing efficient ARRAWs. Finally, we demonstrate examples of the simplest silicon/silica ARRAW platforms that can simultaneously serve as near-IR optical waveguides, and support strong backward Brillouin scattering.

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“…Over the past decades, silicon photonics offer a more promising and attractive platform to address the growing demands for optical communications [1][2][3][4][5][6][7], microwave photonics [8][9][10] and quantum information applications [11][12][13][14], due to the unique advantages of compact footprint, low cost, low power consumption and compatibility with mature complementary metal oxide semiconductor (CMOS) processes. First, benefitting from the property of high index contrast, the silicon on insulator (SOI) platform enables us to design and realize ultracompact photonic integrated devices for large-scale and high-density integrated silicon photonic systems.…”

Section: Introductionmentioning

confidence: 99%

Silicon-based multimode waveguide crossings

Chang

Zhang

2020

J. Phys. Photonics

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Mode multiplexing technique is a new promising option to increase the transmission capacity of on-chip optical interconnects. Multimode waveguide crossings are the key building blocks in high-density and large-scale mode division multiplexing silicon photonic integrated circuits. In this paper, we review the recent progresses on silicon-based multimode waveguide crossings. Firstly, a variety of multimode waveguide crossing schemes are demonstrated and introduced including conventional multimode interference coupler, Maxwell's fisheye lens and inverse-designed multimode interference coupler. Secondly, we also discuss some emerging applications of the inverse design algorithm in the multimode silicon devices to realize ultracompact footprint and multiple functionalities. Finally, we also give the outlook of the development prospects of on-chip multimode waveguide crossings.

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Brillouin integrated photonics

Cited by 312 publications

References 162 publications

Shaping nonlinear optical response using nonlocal forward Brillouin interactions

Shaping nonlinear optical response using nonlocal forward Brillouin interactions

ARRAW: anti-resonant reflecting acoustic waveguides

Silicon-based multimode waveguide crossings

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