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Proceedings Paper

Optomechanical engineering: manipulating light and vibrations in the GHz regime (Conference Presentation)

Paper Abstract

Acoustic phonons in the GHz range have emerged as a suitable platform to study complex wave physics phenomena. This has spurred the development of a large bandwidth of versatile nanophononic devices for full control and manipulation of phonons on the few-nm length scale. Furthermore, the strong interactions between acoustic phonons and other excitations in solids extend the range of applications for nanophononic devices into other areas of research such as electronics and optomechanics. For example, recent advances in material science and fabrication techniques enabled the fabrication of nanometric devices in which photons (VIS-NIR) and phonons (GHz-THz frequencies) are simultaneously confined in a single resonant cavity giving rise to unprecedented large optomechanical coupling factors. In addition, the engineering of acoustic waves with GHz-THz frequencies is also at the base of the study of mechanical quantum phenomena and non-classical states of mechanical motion. In this work I will first introduce and compare strategies to generate, manipulate and detect ultra-high frequency acoustic phonons using ultrashort laser pulses and high resolution Raman scattering. Second, I will describe the acoustic behavior of a series of nanomechanical devices based on nanometric semiconductor multilayers able to control the interactions between light, sound and charge. The presented results open a new playground in the control of acoustic vibrations in solids, providing not only new tools to confine and control the dynamics of ultra-high frequency phonons but also a new platform to study topological and general localization effects.

Paper Details

Date Published: 13 March 2019
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Proc. SPIE 10916, Ultrafast Phenomena and Nanophotonics XXIII, 109161L (13 March 2019); doi: 10.1117/12.2509996
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Published in SPIE Proceedings Vol. 10916:
Ultrafast Phenomena and Nanophotonics XXIII
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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