Analysis of enhanced stimulated Brillouin scattering in silicon slot waveguides

Laer, Raphaël Van; Kuyken, Bart; Thourhout, Dries Van; Baets, Roel

doi:10.1364/ol.39.001242

Cited by 37 publications

(41 citation statements)

References 42 publications

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“…Extreme Brillouin gains approaching 10 12 m −1 W −1 may thus be reachable in ultra-high-Q trapezoidal microdisk WGRs (Fig. 10), which is 10 8 times greater than the highest predicted [27,38] and observed [29] gains in linear waveguides.…”

Section: Discussionmentioning

confidence: 85%

Giant gain enhancement in surface‐confined resonant Stimulated Brillouin Scattering

Dostart

Kim

Bahl

2015

Laser & Photonics Reviews

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The notion that Stimulated Brillouin Scattering (SBS) is primarily defined by bulk material properties has been overturned by recent work on nanoscale waveguides. It is now understood that boundary forces of radiation pressure and electrostriction appearing in such highly confined waveguides can make a significant contribution to the Brillouin gain. Here, this concept is extended to show that gain enhancement does not require nanoscale or subwavelength features, but generally appears where optical and acoustic fields are simultaneously confined near a free surface or material interface. This situation routinely occurs in whispering gallery resonators (WGRs), making gain enhancements much more accessible than previously thought. To illustrate this concept, the first full-vectorial analytic model for SBS in WGRs is developed, including optical boundary forces, and the SBS gain in common silica WGR geometries is computationally evaluated. These results predict that gains 10 4 times greater than the predictions of scalar theory may appear in WGRs even in the 100 μm size range. Further, trapezoidal cross-section microdisks can exhibit very large SBS gains approaching 10 2 m -1 W -1 . With resonant amplification included, extreme gains on the order of 10 12 m -1 W -1 may be realized, which is 10 8 times greater than the highest predicted gains in linear waveguide systems.

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Section: Discussionmentioning

confidence: 85%

Giant gain enhancement in surface‐confined resonant Stimulated Brillouin Scattering

Dostart

Kim

Bahl

2015

Laser & Photonics Reviews

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“…Depending on whether the interaction occurs within the same optical mode (intra-mode FBS) or between different optical modes (inter-mode FBS), the relevant acoustic field either forms a transverse wave with wave length on the order of centimeters or complex a torsional or flexural mode with intermediate wave length (see figure 1). Although observed experimentally as early as 1985 [5] in conventional step index fibers, FBS appears most naturally in waveguides that possess complex transverse structure; FBS has been observed in photonic crystal fibers (PCFs) and tapers [6][7][8][9][10][11][12], while the parallel development of on-chip integrated optical circuits has led to experimental observation of FBS in semiconductor nanowires [13,14], and theoretical consideration of slot waveguides [15] and hybrid photonic-phononic waveguides [16]. The observation that FBS is much easier to generate in integrated silicon circuits than its backward counterpart [14,17,18] means that FBS is critically important for applications that seek to harness the interaction of sound and light on the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Cascaded forward Brillouin scattering to all Stokes orders

et al. 2017

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View the article online for updates and enhancements. AbstractInelastic scattering processes such as Brillouin scattering can often function in cascaded regimes and this is likely to occur in certain integrated opto-acoustic devices. We develop a Hamiltonian formalism for cascaded Brillouin scattering valid for both quantum and classical regimes. By regarding Brillouin scattering as the interaction of a single acoustic envelope and a single optical envelope that covers all Stokes and anti-Stokes orders, we obtain a compact model that is well suited for numerical implementation, extension to include other optical nonlinearities or short pulses, and application in the quantum-optics domain. We then theoretically analyze intra-mode forward Brillouin scattering (FBS) for arbitrary waveguides with and without optical dispersion. In the absence of optical dispersion, we find an exact analytical solution. With a perturbative approach, we furthermore solve the case of weak optical dispersion. Our work leads to several key results on intra-mode FBS. For negligible dispersion, we show that cascaded intra-mode FBS results in a pure phase modulation and discuss how this necessitates specific experimental methods for the observation of fiber-based and integrated FBS. Further, we discuss how the descriptions that have been established in these two classes of waveguides connect to each other and to the broader context of cavity opto-mechanics and Raman scattering. Finally, we draw an unexpected striking similarity between FBS and discrete diffraction phenomena in waveguide arrays, which makes FBS an interesting candidate for future research in quantum-optics.

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“…This is because the effective refractive index of the optical mode has a strong dependency on the slot width [9]. The attractive force can then be calculated [10,11],…”

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confidence: 99%

Strong forces in optomechanically actuated resonant mass sensor

Håkansson¹,

Kuyken²,

Thourhout³

2017

Opt. Express

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Abstract:As resonance mass sensors shrink in order to improve the sensitivity, traditional methods of transduction and readout struggle to keep up with increasing resonance frequencies and decreasing feature sizes. In this work we demonstrate an all-photonically transduced resonant mass sensor that manages to deal with these problems. The strong optomechanical force in slot waveguides is used to drive the mechanical resonanator giving a good signal to noise ratio at low optical powers. Using 120 µW of modulated optical power we measure a frequency noise equivalent to being able to resolve 500 kDa.

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Analysis of enhanced stimulated Brillouin scattering in silicon slot waveguides

Cited by 37 publications

References 42 publications

Giant gain enhancement in surface‐confined resonant Stimulated Brillouin Scattering

Giant gain enhancement in surface‐confined resonant Stimulated Brillouin Scattering

Cascaded forward Brillouin scattering to all Stokes orders

Strong forces in optomechanically actuated resonant mass sensor

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