Spectral shape of stimulated Brillouin scattering in crystals

Ohno, Seigo; Sonehara, T.; Tatsu, E.; Koreeda, Akitoshi; Saikan, S.

doi:10.1103/physrevb.92.214105

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…At room temperature, high-frequency phonons (>10 GHz) have a mean-free path (∼ 100 µm) that is much smaller than the crystal dimension. Cooling this system to cryogenic temperatures, extends the phonon coherence to meter length-scales, permitting the formation of macroscopic high-frequency phonon modes [29,38]. Just as the optical Fabry-Pérot resonator supports a series of standing electromagnetic waves (red, blue) seen in Fig.…”

Section: Bulk Crystalline Optomechanical Systemmentioning

confidence: 98%

High-frequency cavity optomechanics using bulk acoustic phonons

et al. 2019

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To date, microscale and nanoscale optomechanical systems have enabled many proof-of-principle quantum operations through access to high-frequency (gigahertz) phonon modes that are readily cooled to their thermal ground state. However, minuscule amounts of absorbed light produce excessive heating that can jeopardize robust ground-state operation within these microstructures. In contrast, we demonstrate an alternative strategy for accessing high-frequency (13 GHz) phonons within macroscopic systems (centimeter scale) using phase-matched Brillouin interactions between two distinct optical cavity modes. Counterintuitively, we show that these macroscopic systems, with motional masses that are 1 million to 100 million times larger than those of microscale counterparts, offer a complementary path toward robust ground-state operation. We perform both optomechanically induced amplification/transparency measurements and demonstrate parametric instability of bulk phonon modes. This is an important step toward using these beam splitter and two-mode squeezing interactions within bulk acoustic systems for applications ranging from quantum memories and microwave-to-optical conversion to high-power laser oscillators.

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Section: Bulk Crystalline Optomechanical Systemmentioning

confidence: 98%

High-frequency cavity optomechanics using bulk acoustic phonons

et al. 2019

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“…In prior work, Ohno et al demonstrated that extended phonon coherence alters the character of the Brillouin interactions within crystalline substrates at cryo- genic temperatures [40,41]. In this paper, we bridge the gap between cryogenic Brillouin physics and mesoscopic optomechanical interactions by engineering bulk phonons and their interaction with light.…”

Section: Introductionmentioning

confidence: 94%

“…genic temperatures [40,41]. In this paper, we bridge the gap between cryogenic Brillouin physics and mesoscopic optomechanical interactions by engineering bulk phonons and their interaction with light.…”

Section: Introductionmentioning

confidence: 99%

Bulk crystalline optomechanics

et al. 2018

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Brillouin processes couple light and sound through optomechanical three-wave interactions. Within bulk solids, this coupling is mediated by the intrinsic photo-elastic material response yielding coherent emission of high frequency (GHz) acoustic phonons. This same interaction produces strong optical nonlinearities that overtake both Raman or Kerr nonlinearities in practically all solids. In this paper, we show that the strength and character of Brillouin interactions are radically altered at low temperatures when the phonon coherence length surpasses the system size. In this limit, the solid becomes a coherent optomechanical system with macroscopic (cm-scale) phonon modes possessing large (60 µg) motional masses. These phonon modes, which are formed by shaping the surfaces of the crystal into a confocal phononic resonator, yield appreciable optomechanical coupling rates (∼100 Hz), providing access to ultra-high Q-factor (4.2×10 7 ) phonon modes at high (12 GHz) carrier frequencies. The single-pass nonlinear optical susceptibility is enhanced from its room temperature value by more than four orders of magnitude. Through use of bulk properties, rather than nano-structural control, this comparatively simple approach is enticing for the ability to engineer optomechanical coupling at high frequencies and with high power handling. In contrast to cavity optomechanics, we show that this system yields a unique form of dispersive symmetry breaking that enables selective phonon heating or cooling without an optical cavity (i.e., cavityless optomechanics). Extending these results, practically any transparent crystalline material can be shaped into an optomechanical system as the basis for materials spectroscopy, new regimes of laser physics, precision metrology, quantum information processing, and for studies of macroscopic quantum coherence. * william.renninger@yale.edu † These authors contributed equally to this work.

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“…Lastly, we point out that the metallic loss may become the main obstruction toward testing the aforementioned numerical results. High gains are expected in backward Brillouin scattering (BWBS) as well 9 , 32 . In BWBS, both longitudinal and transverse phonons are generated.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic waveguide design for the enhanced forward stimulated brillouin scattering in diamond

Liu

Bibbò

Albin

et al. 2018

Sci Rep

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We propose a scheme of metal/dielectric/metal waveguide for the enhanced forward stimulated Brillouin scattering (FSBS) in diamond that is mediated by gap surface plasmons. Numerical results based on finite-element method show that the maximum Brillouin gain in the small gap (~100 nm) can exceed 106 W−1 m−1, which is three orders of magnitude higher than that in diamond-only waveguides. It is found that the radiation pressure that exists at the boundaries of metal and diamond plays a dominant role in contributing to the enhanced forward stimulated Brillouin gain, although electrostrictive forces interfere destructively. Detailed study shows that high FSBS gain can still be obtained regardless of the photoelastic property of the dielectric material in the proposed plasmonic waveguide. The strong photon-phonon coupling in this gap-surface-plasmon waveguide may make our design useful in the development of phonon laser, RF wave generation and optomechanical information processing in quantum system.

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Spectral shape of stimulated Brillouin scattering in crystals

Cited by 5 publications

References 22 publications

High-frequency cavity optomechanics using bulk acoustic phonons

High-frequency cavity optomechanics using bulk acoustic phonons

Bulk crystalline optomechanics

Plasmonic waveguide design for the enhanced forward stimulated brillouin scattering in diamond

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