Brillouin scattering in hybrid optophononic Bragg micropillar resonators at 300  GHz

Abstract

We introduce a monolithic Brillouin g enera tor based on a semiconductor micropillar cavity embedding a high frequency nanoacoustic resonato r operating in the hundreds of GHz range. The concept of two nested resonato rs allows an independent design of the ultrahigh frequency Brillouin spectrum and of th e optical device. We develop an optical free-space technique to characterize spontaneous Brillouin scattering in this monolithic device and propose a measurement pro tocol that maximizes the Brillouin generation efficiency in th e presence of optically induced thermal effects. The compa ct and versatile Brillouin generator studied here could be readily integrated into fibered and on-chip architectures.

Mesoporous Thin Films for Acoustic Devices in the Gigahertz Range

“…46 Besides, complex architectures such as mesoporous multilayers can be processed as 1D photonic crystals or optical resonators with a selective optical response to vapors with different chemical properties or molecular size. 30,47,48 This application exemplifies that molecular, supramolecular, or photonic information can be encoded into the structure of a multilayer at several length scales 6 , or indeed combined with the plasmonic response. 37 The extension of all these concepts into the nanoacoustic domain represents promising perspectives of this work.…”

“…Nanophononics and nanomechanics deal with vibrations in solids where the typical frequencies are in the range spanning from few GHz up to THz. [1][2][3][4][5][6][7][8][9][10][11][12] These frequencies have associated wavelengths in the 1-100 nm range, making them interesting for high-resolution acoustic imaging and sensing applications. Ultrasound imaging in the kHz-MHz has revolutionized medical applications; a similar impact can be predicted for nanoacoustic waves for non-destructive testing at the nanoscale.…”

“…5,16 Naturally adapted to these requirements, the vast majority of the works on nanophononics are based on samples grown by molecular-beam epitaxy (semiconductor, oxides), 3,[16][17][18][19][20][21] and processed using electron beam lithography (plasmonic and micropillar structures). 6,9,[22][23][24][25] This results in expensive devices with predetermined functionality.…”

Inducing micromechanical motion by optical excitation of a single quantum dot

“…Note that, our result can be readily extended to existing systems, starting with waveguide embedded single photon sources [34], which may host ultra-high frequency mechanical degrees of freedom [35,36]. Other potential high-frequency candidates include hybrid phononic nanostrings [37], surface acoustic waves coupled to quantum dots and NV centers [21,22], and hybrid photonic crystal cavities [38].…”

Generating X-band phonons in a nanostructured silicon optomechanical cavity

“…On-chip optomechanical interactions have been intensively studied in the context of cavity optomechanics [1][2][3] and Brillouin scattering [4], using a wide variety of photonic technologies, including chalcogenides materials [5], gallium arsenide [6][7][8][9], aluminum nitride [10], and lithium niobate [11], to name a few. Optomechanical interactions in silicon have long been precluded by strong phonon leakage towards the silica cladding [12][13][14].…”