Optomechanical Generation of Coherent GHz Vibrations in a Phononic Waveguide

Madiot, Guilhem; Ng, Ryan C.; Arregui, Guillermo; Florez, O.; Albrechtsen, Marcus; Stobbe, Søren; García, Pedro David; Torres, C. M. Sotomayor

doi:10.1103/physrevlett.130.106903

Cited by 17 publications

(14 citation statements)

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“…The backward SBS acoustic mode exhibits a significantly larger group velocity and an extended phonon lifetime than the forward SBS, resulting in a large acoustic decay length. This is also a crucial characteristic for the acoustic waveguides, making SARAWs a promising candidate for supporting the burgeoning field of phononic circuits 45 . Furthermore, the promotions in acoustic mode eigenfrequency and Q m underscore the potential of SARAWs.…”

Section: Discussionmentioning

confidence: 99%

“…In summary, SARAWs incorporate innovations in acoustic anti-resonance theory, intelligent algorithm empowered design, and nanofabrication technique, offering a comprehensive solution for integrated photon-phonon interaction platforms. It heralds a new era for SBS, paving the way for breakthroughs in optomechanics 48 , phononic circuits 45 , and hybrid quantum systems 49 .…”

Section: Discussionmentioning

confidence: 99%

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Anti-resonant acoustic waveguides enabled tailorable Brillouin scattering on chip

Lei,

Xu,

Bai

et al. 2024

Nat Commun

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Empowering independent control of optical and acoustic modes and enhancing the photon-phonon interaction, integrated photonics boosts the advancements of on-chip stimulated Brillouin scattering (SBS). However, achieving acoustic waveguides with low loss, tailorability, and easy fabrication remains a challenge. Here, inspired by the optical anti-resonance in hollow-core fibers and acoustic anti-resonance in cylindrical waveguides, we propose suspended anti-resonant acoustic waveguides (SARAWs) with superior confinement and high selectivity of acoustic modes, supporting both forward and backward SBS on chip. Furthermore, this structure streamlines the design and fabrication processes. Leveraging the advantages of SARAWs, we showcase a series of breakthroughs for SBS within a compact footprint on the silicon-on-insulator platform. For forward SBS, a centimeter-scale SARAW supports a large net gain exceeding 6.4 dB. For backward SBS, we observe an unprecedented Brillouin frequency shift of 27.6 GHz and a mechanical quality factor of up to 1960 in silicon waveguides. This paradigm of acoustic waveguide propels SBS into a new era, unlocking new opportunities in the fields of optomechanics, phononic circuits, and hybrid quantum systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Anti-resonant acoustic waveguides enabled tailorable Brillouin scattering on chip

Lei,

Xu,

Bai

et al. 2024

Nat Commun

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“…In contrast, the use of laser radiation pressure enables fine-tuning of acoustic vibrations in the frequency range of megahertz to gigahertz. 18 For widely used photonic crystals, the photonic bandgap is created through periodic modulation of the refractive index. This modulation produces a bandgap at a specific frequency, effectively suppressing the propagation of electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

“…While current phonon excitation and control methods primarily rely on piezoelectric systems, 16 these methods necessitate electrodes capable of detecting different frequencies and propagation directions, 17 thereby increasing the experimental complexity. In contrast, the use of laser radiation pressure enables fine-tuning of acoustic vibrations in the frequency range of megahertz to gigahertz 18 …”

Section: Introductionmentioning

confidence: 99%

6H-SiC phoxonic microcavities with photonic and phononic bandgaps

Gao,

Wu,

Wang

2024

J. Nanophoton.

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Light propagation and acoustic vibrations can be controlled by designing the bandgap of phoxonic crystals, which support photonic and phononic bandgaps simultaneously. In this study, we numerically investigated the optical and mechanical properties of a clover-shaped 6H-SIC crystal microcavity. The results indicate that the frequency range of the phononic bandgap can be manipulated by adjusting the geometry of the structure, resulting in a wide phononic bandgap over 12 GHz centered at 30.8 GHz. The structure also supports strong localized optical modes for visible light with a Q-factor over 143. Within the photonic and phononic bandgaps of the phoxonic crystal, the structure can reduce mechanical vibrations and support a confined optical mode that can be used for trapping nanoparticles.

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“…A high optomechanical coupling strength enables the operation in the sideband-resolved regime where the sidebands induced on the optical cavity by the modulation due to the [16]) and shamrock holes (b) (Ref. [6]). The lattice periodicity in both waveguides is a = 470 nm, the air slot width s = 55 nm, and membrane thickness t = 220 nm.…”

Section: Introductionmentioning

confidence: 99%

Optomechanical Coupling Optimization in Engineered Nanocavities

Edelstein,

Gomis‐Bresco,

Arregui

et al. 2024

Annalen der Physik

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In optomechanics, the interaction between light and matter is enhanced by engineering cavities where the electromagnetic field and the mechanical displacement are confined simultaneously within the same volume. This leads to a wide range of interesting phenomena, such as optomechanically induced transparency and the cooling of macroscopic objects to their lowest possible motion state. In this manuscript, the focus is on designed optomechanical cavities exploiting heterostructures in air‐slot photonic‐crystal waveguides, incorporating different hole shapes and dimensions to engineer and control their optomechanical properties. The aim is to maximize the optical quality factor of the optical cavity, while ensuring optical mode volumes below the diffraction limit. These optimized optical modes interact with in‐plane motional degrees of freedom of the structures achieving high optomechanical coupling rates, thus opening up the possibility of mechanical amplification, nonlinear dynamics and chaos through the optomechanical back‐action.

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Optomechanical Generation of Coherent GHz Vibrations in a Phononic Waveguide

Cited by 17 publications

References 50 publications

Anti-resonant acoustic waveguides enabled tailorable Brillouin scattering on chip

Anti-resonant acoustic waveguides enabled tailorable Brillouin scattering on chip

6H-SiC phoxonic microcavities with photonic and phononic bandgaps

Optomechanical Coupling Optimization in Engineered Nanocavities

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